OEM Manhole Cover Press Machine Factory

Does the manhole cover press machine need to consider the influence of temperature during the test?

The importance of temperature in the manhole cover press test
The manhole cover press test usually includes the following aspects: force distribution during the press process, molding uniformity, material bonding strength, mold thermal expansion control, product dimensional stability, etc. As an important variable in the physical environment, temperature has a direct or indirect impact on the above indicators:
Material properties are significantly affected by temperature
Especially for composite materials (such as SMC, BMC) manhole covers, there is a thermosetting reaction stage during the molding process. Too high temperature will cause the material to solidify prematurely and reduce the uniformity of the press; too low temperature will cause insufficient fluidity and affect the integrity of the mold filling.
Structural errors caused by mold thermal expansion and contraction
The press molds are mostly made of metal materials (such as 45# steel, Cr12MoV), which are affected by the thermal expansion coefficient and are prone to slight deformation during high-intensity continuous pressing. If the temperature variable is not considered, the size and matching accuracy of the final product will be deviated.
The efficiency of the hydraulic system is closely related to temperature
The viscosity of the hydraulic oil decreases in a high temperature environment, which may cause pressure transmission lag and control failure; under low temperature conditions, it may be difficult to start and insufficient flow. Therefore, the performance test of the pressing machine must simulate the operating state under different ambient temperatures.
Yiyu Equipment's Technical Strength in Temperature Control Testing
As a modern high-tech enterprise specializing in the research and development and manufacturing of mechanical performance testing equipment, Zhejiang Yiyu Instrument Equipment Co., Ltd. has always been at the forefront of the industry. The company is located in Lianxing Village, Dongguan Street, Shangyu District, Shaoxing City, Zhejiang Province. It has a superior geographical location and convenient transportation, which provides a solid foundation for product development, logistics response and service guarantee.
In the development of manhole cover pressing equipment and its supporting test system, Yiyu attaches great importance to the impact of temperature on equipment performance and the accuracy of test results. The multifunctional testing platform developed by the company can perform precise tests on key indicators such as displacement-load relationship, mold deformation characteristics, and material fluidity during the pressing process under simulated different temperature environments, ensuring that the product can meet national standards under various working conditions.
Yiyu has not only established technical cooperation with many domestic scientific research institutes, but also provided tens of thousands of testing equipment to thousands of users at home and abroad, covering the fields of metal, non-metal and composite materials, fully verifying the stability and reliability of its products under different temperature environments.
Practical application suggestions for temperature control and monitoring
In order to improve the scientific nature of the test and the accuracy of the data, Yiyu Instrument Equipment recommends adding the following temperature control measures during the Manhole Cover Press Machine test:
Embedded temperature sensor integrated design
Temperature probes are arranged at the key nodes of the mold and the press head to monitor the mold temperature rise in real time, which serves as the basis for mold expansion compensation and control algorithms.
Ambient temperature simulation box auxiliary test
The ambient temperature of the space where the press is located is controlled (such as 10℃, 25℃, 40℃, etc.) to simulate the pressing performance under the four seasons climate to ensure the versatility of the equipment.
Hydraulic oil temperature automatic adjustment system
The oil cooler and the heater are automatically linked to ensure that the hydraulic system operates within the optimal temperature range (such as 35~45℃) to extend the system life.
Temperature-based multidimensional data acquisition system
Temperature is associated with parameters such as pressure and displacement in time series, and a complete multivariate test curve is output to achieve accurate modeling and optimization of product performance.

What should manhole cover press machine pay attention to when installing

Preparation before installation: Foundation determines success or failure
The first step in equipment installation is to fully survey and prepare the installation site. According to Yiyu's installation experience, the following points are particularly critical:
Foundation bearing and horizontality inspection
As a large hydraulic or mechanical equipment, Manhole Cover Press Machine can weigh several tons and is accompanied by huge downward pressure during operation. A high-strength concrete foundation must be built, with a recommended thickness of not less than 30cm and equipped with steel mesh support. The ground should be leveled and the error should not be greater than ±1mm/m to prevent the equipment from running with an uneven load.
Sufficient reserved space
At least 1.5 meters of operation and maintenance space should be reserved around the equipment to facilitate subsequent electronic control system debugging, mold replacement and hydraulic system maintenance. Yiyu Instrument Equipment recommends that users plan the material flow, finished product stacking area and safe passage in advance to ensure smooth overall operation of the workshop.
Power supply and air source configuration
According to the standard model configuration provided by Yiyu, the equipment needs to be connected to a three-phase 380V industrial power supply and confirm that the grounding protection is good. If it is equipped with an auxiliary pneumatic device, it should also be connected to a stable industrial air source with a stable air pressure of 0.6~0.8MPa.
Key control during installation: Scientific positioning and safety first
During the actual installation process, the Yiyu team emphasized the following key links:
Equipment hoisting requires professional operation
All press equipment should use special lifting belts or wire ropes to ensure balanced force during lifting and avoid damage to oil pipes, cables or control cabinets. Professional technicians should be in charge during the lifting process and avoid dangerous working areas.
Control of horizontal adjustment accuracy
Use a high-precision level (0.02mm level) to detect each contact angle of the equipment point by point. If necessary, fine-tune by adding or subtracting shims to ensure that the equipment does not tilt during operation and extend the life of the mold and cylinder.
Anchoring and anti-vibration measures
According to the arrangement of the holes on the base of the equipment, use high-strength anchor bolts to fix it. Some models can also be equipped with anti-vibration pads to effectively absorb vibration shocks and avoid affecting the workshop structure and surrounding equipment.
System connection and function debugging: one-step, twice the result with half the effort
Yiyu has always emphasized that "system debugging is the secondary molding of equipment performance", so the installation and debugging of each Manhole Cover Press Machine is particularly strict:
Hydraulic system sealing inspection
When installing the hydraulic pipeline, special sealing tape or sealing ring should be used to connect each joint, and observe whether there is micro-seepage, oil leakage, etc. through the initial startup. All oil pipes should be arranged neatly to avoid bending dead corners.
Electronic control system wiring specifications
Be sure to check the wiring drawings before wiring, and the operation must be performed by a certified electrician. Each input and output terminal, sensor, and relay module must be clearly marked, and the control cabinet wiring must be standardized and not loose.
PLC and human-machine interface (HMI) function test
Test whether each parameter setting function responds accurately, such as pressure setting, stroke setting, manual/automatic switching, emergency stop response, etc. Most Yiyu Instrument Equipment are equipped with touch-screen human-machine interfaces, which are convenient for users to quickly master and operate.
Mold installation and alignment test
After installing the mold on the upper and lower press plates, a precise alignment test should be performed to avoid uneven thickness of the pressed product caused by mold deviation. Yiyu provides an integrated mold guide device to greatly improve the efficiency and accuracy of mold centering.
After-sales guarantee and installation service: Yiyu's core competitiveness
As a national high-tech enterprise, Zhejiang Yiyu Instrument Equipment Co., Ltd. has rich on-site installation experience and a professional team in the field of manhole cover presses. Whether the user is in a domestic first-tier city or an overseas project site, Yiyu can dispatch technical engineers to install and debug within the specified time.
The company has long adhered to the concept of "quality first, service-oriented", providing users with:
Installation guide manual and video tutorial
Remote video diagnosis and technical answers
Free on-site debugging and one-year warranty service within the warranty period
Lifetime maintenance and parts supply guarantee

What safety protection devices does the manhole cover press machine have

Safety protection is the core consideration of the design of the manhole cover press machine
The manhole cover pressing process is usually accompanied by hydraulic pressure of up to tens of tons or even hundreds of tons. Once the operation is improper or the system fails, the consequences may be very serious. Therefore, it has become the industry standard for the design of manhole cover pressing equipment to be equipped with multiple active + passive safety protection systems, and Yiyu Instrument Equipment continues to optimize and upgrade on this basis.
Core safety protection devices configured in Yiyu manhole cover pressing machine
1. Two-hand synchronous start system (Two-hand Control System)
In order to prevent the operator's hands from accidentally entering the dangerous area during the falling process of the pressure head, Yiyu Instrument Equipment adopts two-hand button control. The control buttons on both sides must be pressed at the same time to start the pressing action, and the pressing action will stop immediately if the hands are released in the middle. This design greatly reduces the risk of human operation and is one of the safety standards widely used in current industrial equipment.
2. Photoelectric protection device (Photoelectric Safety Curtain)
Some mid-to-high-end models of manhole cover pressing machines of Yiyu Instrument Equipment are equipped with imported infrared grating safety protection systems. The system forms an invisible light curtain in the working area. Once a human body or foreign object enters the working area, the equipment will automatically stop running and issue an audible and visual alarm to effectively prevent accidental injuries.
3. Emergency Stop Control System (Emergency Stop Button)
One-touch emergency stop switches are set in many places of the equipment, including the main operation panel, hydraulic control unit and maintenance position, to ensure that the power of the equipment can be immediately cut off in case of sudden failure or misoperation to protect the safety of personnel and equipment.
4. Pressure/displacement dual monitoring system
The control system developed by Zhejiang Yiyu Instrument Equipment Co., Ltd. integrates high-precision pressure sensors and displacement encoders to achieve real-time monitoring and feedback control of the hydraulic system pressure process. Once overpressure, abnormal pressure fluctuations, and stroke overlimit occur, the system will automatically alarm and stop the operation to prevent mold damage or operator injury due to equipment malfunction.
5. Hydraulic system safety valve and limit valve
All hydraulic circuits are equipped with safety overflow valves. When the system pressure exceeds the set threshold, the pressure is automatically released to prevent pipeline rupture. At the same time, upper and lower limit switches are configured to ensure that the equipment stroke is within the safe range to prevent excessive pressure from damaging the mold or impacting the equipment structure.
6. Equipment protection door and interlocking system
Some models of Yiyu are equipped with a protective door structure with an electromagnetic lock. The door body is locked during operation, and the power is cut off and the machine is shut down immediately when it is opened, truly realizing human-machine isolation. In the automated production line, the device can be linked with the conveyor belt and the robotic arm system to form an overall safety closed loop.