A test device for compression moulding dies

Abstract

The application discloses a kind of test devices of compression mould, it is related to mould equipment field, comprising: lower die oil cylinder group, lower die is set on the lower die oil cylinder group, the lower die oil cylinder group can drive lower die up and down movement, the lower die oil cylinder group is provided with three-position four-way valve;And servo rotary cam mechanism;Wherein, the upper die is located above the lower die, the servo rotary cam mechanism can drive the three-position four-way valve switching station, the three-position four-way valve switching station can change the hydraulic drive lower die of the lower die oil cylinder group and the opening and closing mould of upper die.This test device of compression mould can simulate the working condition of mould in normal compression moulding process according to the action logic of single mould in compression moulding process, so as to detect the quality of single mould in repeated test process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mold equipment, in particular to a test device of compression molding mold. BACKGROUND

[0002] With the development of economy, domestic large beverage enterprises have strong demand for high-speed, high-efficiency and high-stability molding production equipment production line, and the existing injection molding process has been increasingly mature. However, for thin-walled multi-cavity products, the traditional injection molding process has no much advantage, and the initial development of the mold for thin-walled multi-cavity products by injection molding process requires a large investment and a long cycle. The use of rotary compression molding process can simplify the mold, so that the mold can focus on the design and processing of a single structure, and through the circular mode of rotation, a plurality of single-structure molds are arranged in a circle, which has an advantage in cycle compared with the injection molding process for thin-walled multi-cavity products. The use of compression molding process for thin-walled products can simplify the mold, so that the mold can focus on the design and processing of a single structure. However, due to the acceleration of the cycle and the rapid opening and closing of the mold, higher requirements are put forward for the design and processing of the single mold. Nowadays, the phenomenon that the design and processing of the single mold do not meet the requirements often occurs. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a test device of compression molding mold, which can simulate the working condition of the mold in the normal compression molding process according to the action logic of the single mold in the compression molding process, so as to detect the quality of the single mold in the repeated test process.

[0004] The present application adopts the following technical solutions:

[0005] A test device of compression molding mold, comprising: a lower mold oil cylinder group, a lower mold being arranged on the lower mold oil cylinder group, the lower mold oil cylinder group being capable of driving the lower mold to move up and down, the lower mold oil cylinder group being provided with a three-position four-way valve; and a servo rotary cam mechanism; wherein an upper mold is located above the lower mold, the servo rotary cam mechanism being capable of driving the three-position four-way valve to switch positions, the three-position four-way valve switching positions being capable of changing the hydraulic driving of the lower mold oil cylinder group to open and close the mold with the upper mold.

[0006] As a preferred, the lower mold oil cylinder group comprises: a lower mold piston rod, the lower mold piston rod being capable of driving the lower mold to move up and down; an oil cylinder hole, the lower mold piston rod being arranged on the oil cylinder hole, the change of the hydraulic pressure in the oil cylinder hole being capable of driving the lower mold piston rod to move up and down; and a mechanical valve hole, the three-position four-way valve being arranged in the mechanical valve hole; the oil cylinder hole and the mechanical valve hole being in communication, the three-position four-way valve switching positions being capable of changing the hydraulic pressure of the oil cylinder hole.

[0007] As preferred, the mechanical valve hole is provided with a low-pressure oil hole, a high-pressure oil hole and an oil discharge hole, each position of the three-position four-way valve corresponds to the opening of the low-pressure oil hole, the high-pressure oil hole and the oil discharge hole; The oil cylinder hole is provided with an upper oil cavity hole and a lower oil cavity hole, and the lower oil cavity hole communicates with the mechanical valve hole.

[0008] As preferred, the three-position four-way valve comprises a roller, the roller is in transmission connection with the servo rotary cam mechanism, the servo rotary cam mechanism can drive the roller to move up and down; a valve core, the roller can drive the valve core to move up and down; a valve sleeve, the valve core is arranged in the valve sleeve; and an elastic member, the elastic member is arranged in the valve sleeve, and the elastic member generates a downward force to the valve core.

[0009] As preferred, the servo rotary cam mechanism comprises a cam, the outer edge surface of the cam is provided with a plurality of curved surfaces, and the three-position four-way valve can switch different positions under the action of each curved surface; and a cam driving mechanism, so that the cam driving mechanism can drive the cam to rotate.

[0010] As preferred, the plurality of curved surfaces provided on the outer edge surface of the cam comprises a high-pressure curved surface, when the high-pressure curved surface moves to the highest position, the high-pressure oil hole and the lower oil cavity hole are in a conductive state, and the low-pressure oil hole and the oil discharge hole are in a cut-off state; an oil discharge curved surface, when the oil discharge curved surface moves to the highest position, the oil discharge hole and the lower oil cavity hole are in a conductive state, and the high-pressure oil hole and the low-pressure oil hole are in a cut-off state; and a low-pressure curved surface, when the low-pressure curved surface moves to the highest position, the low-pressure oil hole and the lower oil cavity hole are in a conductive state, and the high-pressure oil hole and the oil discharge hole are in a cut-off state.

[0011] As preferred, the cam driving mechanism further comprises a servo motor, a speed reducer and a cam connecting shaft, and the servo motor, the speed reducer, the cam connecting shaft and the cam are in transmission connection.

[0012] As preferred, it further comprises a demolding device, which can eject the compression molding product from the upper mold.

[0013] As preferred, the demolding device comprises a demolding driving mechanism, which can eject the compression molding product from the upper mold; and a demolding reset mechanism, which can drive the demolding driving mechanism to reset after the compression molding product is separated from the upper mold.

[0014] As preferred, the upper mold comprises a demolding device and a punch, the demolding device is arranged above the punch, and the demolding driving mechanism can drive the demolding device to move downward to eject the compression molding product from the upper mold.

[0015] Compared with the prior art, the test device for the compression molding mold has the beneficial effects that the test device for the compression molding mold can simulate the working condition of the mold in the normal compression molding process according to the action logic of the single mold in the compression molding process, so as to detect the quality of the single mold. The test device for the compression molding mold is provided with the servo rotary cam mechanism and the three-position four-way valve, the three-position four-way valve can control the hydraulic pressure of the lower oil cylinder group, the linkage of the servo rotary cam mechanism, the three-position four-way valve and the lower oil cylinder group is quickly realized, the working position switching of the three-position four-way valve is realized in real time by controlling the continuous operation of the servo rotary cam mechanism, the normal working condition of the mold opening and closing is simulated, and the continuous simulation of the normal working condition of the machine is realized. The test device for the compression molding mold can quickly detect the problems of the single cavity mold in the normal production, and detect the problems of the execution element matched with the mold in the repeated movement process. The test device for the compression molding mold can quickly detect the service life of the important execution element of the mold and the machine, problems are found in time, relevant problems are used to deduce and improve the relevant design, major problems in the operation of the machine are avoided, and the operation and maintenance cost of the machine is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 FIG. 1 is a structural schematic view of the test device for the compression molding mold in the embodiment of the present application.

[0017] Fig. 2 FIG. 4 is a structural schematic view of the lower mold oil cylinder group in the embodiment of the present application.

[0018] Fig. 3 FIG. 6 is a structural schematic view of the three-position four-way valve in the embodiment of the present application.

[0019] Fig. 4 FIG. 8 is a structural schematic view of the servo rotary cam mechanism in the embodiment of the present application.

[0020] Fig. 5 FIG. 10 is a structural schematic view of the cam in the embodiment of the present application.

[0021] Fig. 6 FIG. 12 is a structural schematic view of the demolding device combined with the upper mold in the embodiment of the present application.

[0022] Reference numerals: 1. Upper mold; 2. Lower mold; 3. Upper mold cylinder assembly; 4. Lower mold cylinder assembly; 5. Servo rotary cam mechanism; 6. Demolding device; 7. Mounting platform; 8. Three-position four-way valve; 9. Cylinder upper cover; 10. Cylinder lower cover; 11. Lower mold cylinder mounting base; 12. Lower mold piston rod; 13. Cylinder hole; 14. Mechanical valve hole; 15. Low-pressure oil hole; 16. High-pressure oil hole; 17. Oil drain hole; 18. Upper oil chamber hole; 19. Lower oil chamber hole; 20. Roller; 21. Push rod; 2 2. Push rod mounting base; 23. Valve sleeve; 24. Valve core; 25. Spring; 26. Cam; 27. Servo motor; 28. Reducer; 29. ​​Cam connecting shaft; 30. High-pressure curved surface; 31. Oil drainage curved surface; 32. Low-pressure curved surface; 33. Upper mold mounting base; 34. Upper mold piston rod; 35. Demolding device; 36. Nut; 37. Demolding connecting block; 38. Copper sleeve; 39. Demolding shaft cover; 40. Demolding shaft; 41. Punch; 42. Demolding spring; 43. Compression molded product. Detailed Implementation

[0023] The following is combined with Figs. 1-6 The technical solution provided by the invention will be described in more detail.

[0024] like Figs. 1-6 As shown, this embodiment of the invention provides a testing device for a compression mold. The testing device includes an upper mold 1, a lower mold 2, an upper mold cylinder assembly 3, a lower mold cylinder assembly 4, a servo rotary cam mechanism 5, a demolding device 6, and a mounting platform 7. The upper mold 1 is located above the lower mold 2, and the upper mold 1 and lower mold 2 are arranged vertically along the same center line. The servo rotary cam mechanism 5 is fixed to the side of the mounting platform 7 with screws. The lower mold cylinder assembly 4 is fixed above the mounting platform 7 with screws. The upper mold cylinder assembly 3 is positioned above the lower mold cylinder assembly 4. The upper mold 1 and the demolding device 6 are mounted on an upper mold mounting base 33. The lower mold 2 is mounted on the lower mold cylinder assembly 4, which can drive the lower mold 2 to move up and down. The lower mold cylinder assembly 4 is equipped with a three-position four-way valve 8, which is a mechanical three-position four-way valve 8, and is fixed to the bottom of the lower mold cylinder assembly 4 with screws. The servo rotary cam mechanism 5 can drive the three-position four-way valve 8 to switch positions, thereby controlling multiple hydraulic pressures and directions of the lower mold cylinder group 4. The three-position four-way valve 8 can change the hydraulic drive of the lower mold cylinder group 4 to open and close the lower mold 2 and the upper mold 1. The demolding device 6 can eject the compression-molded product 43 from the upper mold 1.

[0025] The lower die oil cylinder group 4 includes an oil cylinder upper cover 9, an oil cylinder lower cover 10, a lower die oil cylinder mounting seat 11, a lower die piston rod 12, an oil cylinder hole 13, and a mechanical valve hole 14. The oil cylinder hole 13 penetrates the lower die oil cylinder mounting seat 11, the lower die piston rod 12 is arranged on the oil cylinder hole 13, the oil cylinder upper cover 9 is arranged above the oil cylinder hole 13, the oil cylinder lower cover 10 is arranged below the oil cylinder hole 13, and the mechanical valve hole 14 is arranged below the lower die oil cylinder mounting seat 11. The lower die piston rod 12 is connected with the lower die 2, and the lower die piston rod 12 can drive the lower die 2 to move up and down. The hydraulic pressure in the oil cylinder hole 13 can be changed to drive the lower die piston rod 12 to move up and down. The oil cylinder hole 13 is in communication with the mechanical valve hole 14, and the three-position four-way valve 8 is arranged in the mechanical valve hole 14. The three-position four-way valve 8 can change the hydraulic pressure in the oil cylinder hole 13 by switching the working position.

[0026] The mechanical valve hole 14 is provided with a low-pressure oil hole 15, a high-pressure oil hole 16, and a drain hole 17. Each working position of the three-position four-way valve 8 corresponds to the opening of the low-pressure oil hole 15, the high-pressure oil hole 16, and the drain hole 17. That is, when the three-position four-way valve 8 is in the working position of opening the low-pressure oil hole 15, the high-pressure oil hole 16 and the drain hole 17 are disconnected; when the three-position four-way valve 8 is in the working position of opening the high-pressure oil hole 16, the low-pressure oil hole 15 and the drain hole 17 are disconnected; and when the three-position four-way valve 8 is in the working position of opening the drain hole 17, the high-pressure oil hole 16 and the low-pressure oil hole 15 are disconnected. The oil cylinder hole 13 is provided with an upper oil cavity hole 18 and a lower oil cavity hole 19, and the lower oil cavity hole 19 is in communication with the mechanical valve hole 14. The low-pressure oil hole 15, the high-pressure oil hole 16, and the drain hole 17 are used to provide hydraulic power to realize the up-and-down movement of the lower die piston rod 12.

[0027] The three-position four-way valve 8 includes a roller 20, a push rod 21, a push rod mounting seat 22, a valve sleeve 23, a valve core 24, and a spring 25. The roller 20 is mounted at the bottom of the push rod 21, the roller 20 is in transmission connection with the servo rotary cam mechanism 5, the servo rotary cam mechanism 5 can drive the roller 20 and the push rod 21 to move up and down, the top of the push rod 21 abuts against the bottom of the valve core 24, and the push rod 21 can push the valve core 24 to move upward when the push rod 21 moves upward, so as to realize the opening and closing of the passage of the valve sleeve 23. The valve core 24 and the spring 25 are located inside the valve sleeve 23, the top of the spring 25 abuts against the inner wall of the valve sleeve 23, the bottom of the spring 25 abuts against the top of the valve core 24, and the spring 25 generates a downward force to the valve core 24. The spring 25 makes the valve core 24 and the push rod 21 tightly adhere to each other and provides a pushing force to the valve core 24, so that the roller 20 is in the lowest position.

[0028] The servo rotary cam mechanism 5 comprises a cam 26 and a cam driving mechanism capable of driving the cam 26 to rotate, the cam driving mechanism comprising a servo motor 27, a speed reducer 28 and a cam connecting shaft 29, which are sequentially in transmission connection. The servo motor 27 drives the speed reducer 28 to rotate the cam connecting shaft 29 and the cam 26. At the same time, the cam 26 drives the three-position four-way valve 8 to sequentially switch to different stations, so as to realize the opening and closing mold working condition of the normal machine.

[0029] The outer edge surface of the cam 26 is provided with a plurality of curved surfaces, including a high-pressure curved surface 30, an oil discharge curved surface 31 and a low-pressure curved surface 32. The servo motor 27 drives the speed reducer 28 to rotate the cam 26, so that the roller 20 drives the valve core 24 to displace due to the contact with different curved surfaces of the cam 26, so that the three-position four-way valve 8 can switch different stations under the action of each curved surface, so as to realize the control of a plurality of hydraulic directions and pressures of the lower mold oil cylinder group 4, so as to realize the functions of quickly supplying, quickly realizing low-pressure high-speed mold locking and quickly realizing high-pressure mold closing for the lower mold oil cylinder group 4.

[0030] When the high-pressure curved surface 30 of the cam 26 moves to the highest position, the roller 20 is not in contact with the cam 26 at this time, which is in a state of being ready to contact. At this time, the valve core 24 is in the lowest position, the high-pressure oil port of the valve sleeve 23 is in the on state, and the low-pressure oil port and the oil discharge port are in the off state. The high-pressure oil hole 16 and the lower oil cavity hole 19 of the lower mold oil cylinder group 4 are in the on state, and the low-pressure oil hole 15 and the oil discharge hole 17 are in the off state. At this time, the high-pressure oil flows to the oil cylinder hole 13 through the lower oil cavity hole 19, so that the lower mold piston rod 12 moves upward under high pressure, and the test device is in a high-pressure state of mold closing and product cooling process.

[0031] When the oil discharge curved surface 31 of the cam 26 moves to the highest position, the roller 20 is in contact with the cam 26, the valve core 24 is in the highest position, the oil discharge port of the valve sleeve 23 is in the on state, the high-pressure oil port and the low-pressure oil port are in the off state, the oil discharge hole 17 and the lower oil cavity hole 19 of the lower mold oil cylinder group 4 are in the on state, and the high-pressure oil hole 16 and the low-pressure oil hole 15 are in the off state. Hydraulic oil flows out of the oil discharge hole 17 through the lower oil cavity hole 19, and the lower mold piston rod 12 moves downward by the oil inlet of the upper oil cavity hole 18. At this time, the test device is in the process of oil discharge, mold opening, demolding and melt insertion. The upper oil cavity hole 18 is in a state of being always on, and the hydraulic pressure thereof is lower than the hydraulic pressure in the low-pressure oil hole 15 and the high-pressure oil hole 16, and higher than the oil discharge pressure. The lower mold piston rod 12 realizes reciprocating motion by the pressure difference between the two.

[0032] When the low pressure curve 32 of the cam 26 moves to the highest position, at this time the roller 20 is in contact with the cam 26, the valve core 24 is in the intermediate position, the low pressure oil port of the valve sleeve 23 is in the open state, the high pressure oil port and the oil discharge port are in the off state, the low pressure oil hole 15 and the lower oil cavity hole 19 of the lower die cylinder group 4 are in the open state, and the high pressure oil hole 16 and the oil discharge hole 17 are in the off state. At this time, the low pressure oil flows through the lower oil cavity hole 19 to the oil cylinder hole 13, so that the lower die piston rod 12 moves upward under low pressure, thereby allowing the test device to be in the rapid mold locking process.

[0033] The upper die 1 includes an ejector 35 and a punch 41, and the ejector 35 is arranged above the punch 41. The upper die cylinder group 3 includes an upper die mounting seat 33 and an upper die piston rod 34. The ejection device 6 is pushed by the upper die piston rod 34 of the upper die cylinder group 3 to achieve the function of pushing the compression molded product 43 out of the upper die 1. The ejection device 6 includes an ejection driving mechanism and an ejection reset mechanism. The ejection driving mechanism can drive the ejector 35 to move downward to push the compression molded product 43 out of the upper die 1. The ejection driving mechanism includes a nut 36, an ejection connecting block 37, a copper sleeve 38, an ejection shaft upper cover 39 and an ejection shaft 40. The ejection shaft upper cover 39 is fixed on the upper die mounting seat 33, the copper sleeve 38 is embedded in the bottom of the upper die mounting seat 33, the ejection shaft 40 penetrates through the upper die mounting seat 33, and the ejection shaft upper cover 39 and the copper sleeve 38 are sleeved on the ejection shaft 40. During the ejection process, the ejection shaft 40 reciprocates between the ejection shaft upper cover 39 and the copper sleeve 38. One end of the ejection connecting block 37 is fixed on the ejection shaft 40 through the nut 36, and the other end is arranged on the ejector 35. The ejection connecting block 37 realizes the association between the ejection device 6 and the upper die 1. The ejection shaft 40 is driven downward by the upper die piston rod 34 of the upper die cylinder group 3, and the ejection connecting block 37 drives the ejector 35 to move downward with the ejection shaft 40, thereby realizing that the ejector 35 pushes the compression molded product 43 out of the upper die 1. After the compression molded product 43 is separated from the upper die 1, the ejection reset mechanism can drive the ejector 35 to move upward to reset. The ejection reset mechanism includes an ejection spring 42, which is sleeved on the ejection shaft 40. The ejection spring 42 is located between the copper sleeve 38 and the ejection shaft upper cover 39. When the lower die cylinder group 4 is in the oil discharge opening mode, the upper die piston rod 34 of the upper die cylinder group 3 reciprocates upward and downward under the control of the hydraulic valve, providing a pushing force for the downward movement of the ejection shaft 40, thereby driving the ejector 35 to move downward to realize the ejection of the compression molded product 43 from the punch 41. When the ejection shaft 40 is not affected by the upper die cylinder group 3, the elastic force of the ejection spring 42 can realize the reset of the ejector 35.

[0034] The test device of the compression molding die of the embodiment has the working cycle of 1) melt insertion; 2) low-pressure fast locking; 3) high-pressure locking and cooling; 4) oil discharge and mold opening; and 5) demolding. By controlling the continuous operation of the servo motor 27, the position switching of the three-position four-way valve 8 can be realized in real time, the linkage of the servo rotary cam mechanism 5, the three-position four-way valve 8 and the lower oil cylinder group can be quickly realized, so as to realize the opening and closing conditions of the normal machine, and realize the continuous simulation of the normal working condition of the machine.

[0035] The test device of the compression molding die of the embodiment has the working cycle of 1) melt insertion; 2) low-pressure fast locking; 3) high-pressure locking and cooling; 4) oil discharge and mold opening; and 5) demolding. By controlling the continuous operation of the servo motor 27, the position switching of the three-position four-way valve 8 can be realized in real time, the linkage of the servo rotary cam mechanism 5, the three-position four-way valve 8 and the lower oil cylinder group can be quickly realized, so as to realize the opening and closing conditions of the normal machine, and realize the continuous simulation of the normal working condition of the machine.

[0036] The test device of the compression molding die of the embodiment realizes compact design, and has the vertical arrangement of the upper mold oil cylinder group 3, the upper mold 1, the lower mold 2, the lower mold oil cylinder group 4 and the servo rotary cam mechanism 5 from top to bottom, and the upper mold oil cylinder group 3 is arranged above the upper mold 1, so as to realize the same power source of the lower oil cylinder group and realize the action of simulating mold unloading, thereby simulating a complete set of process flow of the normal machine and the mold, and repeating the cycle, simulating the working condition of the mold in the normal compression molding process according to the action logic of the single mold in the compression molding process, so as to detect the quality of the single mold in the repeated test process.

[0037] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. A testing device for compression molding, characterized in that, include: The lower mold cylinder assembly has a lower mold mounted on it. The lower mold cylinder assembly can drive the lower mold to move up and down. The lower mold cylinder assembly is equipped with a three-position four-way valve and a servo rotary cam mechanism. The upper mold is located above the lower mold. The servo rotary cam mechanism can drive the three-position four-way valve to switch positions. The three-position four-way valve changes the hydraulic circuit of the lower mold cylinder group by switching positions, so as to drive the lower mold and the upper mold to open and close. The lower mold cylinder assembly includes: a lower mold piston rod, which can drive the lower mold to move up and down; The lower die piston rod is disposed on the cylinder bore, and changing the hydraulic pressure in the cylinder bore can drive the lower die piston rod to move up and down; and the mechanical valve bore is disposed on the three-position four-way valve. The cylinder bore is connected to the mechanical valve bore, and the three-position four-way valve can change the hydraulic pressure of the cylinder bore by switching positions. The cylinder bore is provided with an upper oil chamber bore and a lower oil chamber bore, and the lower oil chamber bore is connected to the mechanical valve bore. The three-position four-way valve includes: a roller, which is connected to the servo rotary cam mechanism, and the servo rotary cam mechanism can drive the roller to move up and down. The valve core is driven to move up and down by the roller. Valve sleeve, wherein the valve core is disposed within the valve sleeve; and An elastic element is disposed within the valve sleeve, and the elastic element generates a downward force on the valve core; The servo rotary cam mechanism includes: a cam, the outer edge surface of which is provided with several curved surfaces, and the three-position four-way valve can switch different work positions under the action of each curved surface; and a cam drive mechanism, which can drive the cam to rotate.

2. The testing apparatus for compression molds according to claim 1, characterized in that, The mechanical valve orifice is provided with a low-pressure oil orifice, a high-pressure oil orifice, and an oil drain orifice. Each position of the three-position four-way valve corresponds one-to-one with opening the low-pressure oil orifice, the high-pressure oil orifice, and the oil drain orifice.

3. The testing apparatus for compression molding according to claim 2, characterized in that, The outer edge surface of the cam is provided with several curved surfaces, including a high-pressure curved surface. When the high-pressure curved surface moves to the highest position, the high-pressure oil hole and the lower oil cavity hole are in a conductive state, and the low-pressure oil hole and the oil drain hole are in a closed state. The oil draining surface, when it moves to its highest position, has the oil drain hole and the lower oil cavity hole in a conductive state, and the high-pressure oil hole and the low-pressure oil hole in a disconnected state; and the low-pressure surface, when it moves to its highest position, has the low-pressure oil hole and the lower oil cavity hole in a conductive state, and the high-pressure oil hole and the oil drain hole in a disconnected state.

4. The testing apparatus for compression molds according to claim 1, characterized in that, The cam drive mechanism also includes a servo motor, a reducer, and a cam connecting shaft, which are sequentially connected for transmission.

5. The testing apparatus for compression molds according to claim 1, characterized in that, It also includes a demolding device that can eject the compression-molded product from the upper mold.

6. The testing apparatus for compression molds according to claim 5, characterized in that, The demolding device includes: a demolding drive mechanism, which can eject the compression-molded product from the upper mold; and a demolding reset mechanism, which can drive the demolding drive mechanism to reset after the compression-molded product is removed from the upper mold.

7. The testing apparatus for compression molds according to claim 6, characterized in that, The upper mold includes a demolding device and a punch. The demolding device is positioned above the punch. The demolding drive mechanism can drive the demolding device to move downwards to eject the compression molded product from the upper mold.

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