Valve chamber cover detection apparatus

Abstract

The present application belongs to the valve chamber cover detection technical field, especially relates to a valve chamber cover detection equipment, it includes conveying device, mechanical hand one, tool cover, tightening assembly, the tightening assembly is by multiple tightening assembly units, the detection equipment of the present application, when connecting the tool cover and the valve chamber cover, the structure of connecting the tool cover and the valve chamber cover is uniformly driven by two external motors, saves time and manpower. The present application places the valve chamber cover on the conveying device during detection, the conveying device will transport the valve chamber cover to the designated position for detection, without frequent manual operation, reduces the labor cost, at the same time, one mechanical hand one can complete all detection steps of one valve chamber cover, reduces the cost of configuring mechanical hand one.

Description

Technical Field

[0001] This invention belongs to the field of valve cover testing technology, and particularly relates to a valve cover testing device. Background Technology

[0002] The engine valve cover, also known as the valve chamber cover, is the uppermost sealing component of the engine. It works in conjunction with the oil pan to seal the engine lubricating oil, preventing it from leaking out when the engine is running.

[0003] During the production of valve covers, it is necessary to check their airtightness. The current method is to produce a corresponding tooling for the valve cover, place the valve cover on the tooling, fix it with multiple bolts, and then draw or blow air into the cavity formed by the valve cover and the tooling, observe whether the pressure changes within a certain period of time, and then determine whether the valve cover is qualified.

[0004] The installation preparation and disassembly work before inspection in the above process takes a long time due to the large number of bolts involved.

[0005] In addition, to improve testing efficiency, multiple toolings are produced to facilitate the simultaneous testing of multiple valve cover covers. During testing, the valve cover covers need to be placed on the toolings frequently. If this is done manually, it is very physically demanding. If it is done by robots, each tooling needs to be equipped with a robot, which is costly.

[0006] This invention designs a valve cover testing device to solve the above problems. Summary of the Invention

[0007] To achieve the above objectives, the present invention employs the following technical solutions:

[0008] A valve cover inspection device includes a conveying device, a robotic arm, a fixture cover, and a tightening assembly. The valve cover is placed on the conveying device. The robotic arm has a vacuum extraction pipe and a gripping end installed on its actuator end. The gripping end is fixedly installed on the upper end of the fixture cover. During inspection, the robotic arm grips the fixture cover by using the gripping end installed on its actuator end. The fixture cover has a vacuum connection end, on which a switching valve is installed. The vacuum connection end and the actuator end of the robotic arm form a vacuum connection. The air extraction pipe is connected; the upper end of the tooling cover has a pressure gauge, and the tooling cover and valve cover are connected by a tightening assembly. The pressure gauge can observe the air pressure change in the cavity between the tooling cover and the valve cover; two drive wrenches are installed on the execution end of the first robotic arm, and the tightening assembly can be adjusted by the drive wrenches to clamp the tooling cover and valve cover together; a second robotic arm is installed on one side of the conveying device, and an air pump is installed on the second robotic arm to blow air into the tooling cover and valve cover to open them.

[0009] As a preferred embodiment, two rows of support and limiting blocks are symmetrically installed on the conveyor belt of the conveying device, with gaps between adjacent support and limiting blocks.

[0010] As a preferred embodiment, the tightening assembly is composed of multiple tightening assembly units.

[0011] The tightening assembly unit includes a first screw, an upper pressure plate, an adjusting slider, a lower pressure plate, a fixing block, a connecting block, a guide rail plate, a second screw, a threaded sleeve, and an installation slider. Two upper pressure plates are fixedly mounted on the fixed surface of the tooling cover edge. Two guide rail plates are symmetrically fixedly mounted on the two upper pressure plates. An installation slider is slidably mounted inside each of the two guide rail plates. The two installation sliders are connected by a connecting block, the lower side of which has a bevel. A threaded sleeve is rotatably mounted on each installation slider, and a second screw is threadedly mounted on each threaded sleeve. The second screw passes through the corresponding installation slider and a first connecting rod is fixedly mounted thereon. A lower pressure plate is fixedly mounted on the first connecting rod. The fixing block is fixedly mounted on the fixed surface of the tooling cover edge. A first screw is rotatably mounted on the fixing block. The adjusting slider is slidably mounted between the two guide rail plates. The upper end face of the adjusting slider has a bevel, and the adjusting slider contacts and engages with the connecting block. The adjusting slider is threadedly connected to the first screw.

[0012] The first screw between adjacent tightening component units is connected by gear transmission, and the second screw between adjacent tightening component units is connected by gear transmission.

[0013] As a preferred embodiment, the outer circular surface of the threaded sleeve has a toothed ring, and the third gear and the fourth gear are coaxially rotatably mounted on the corresponding mounting slider, with the third gear meshing with the toothed ring; the transmission shaft is rotatably mounted on the corresponding mounting slider, and a fifth gear is fixedly mounted on the transmission shaft, with the fifth gear meshing with the fourth gear.

[0014] As a preferred embodiment, the transmission shaft between the adjacent tightening component units is connected to the first shaft via a universal joint; the first shaft is a telescopic shaft and its two ends are respectively fixedly mounted on two adjacent mounting sliders.

[0015] As a preferred embodiment, the second rotating shaft is rotatably mounted on the fixed surface of the tooling cover edge, and the second rotating shaft is connected to the first screw via gear transmission.

[0016] As a preferred embodiment, the tool cover has a square edge, and the four second rotating shafts corresponding to the four edges are respectively connected by two second gears; the four first rotating shafts corresponding to the four edges are respectively connected by two first gears.

[0017] As a preferred embodiment, two first connecting rods in the same tightening assembly unit are fixedly connected by multiple second connecting rods.

[0018] As a preferred embodiment, the first input shaft is rotatably mounted on one of the mounting sliders, and the upper end of the first input shaft has a hexagonal groove; the first input shaft is connected to the corresponding transmission shaft via gear transmission; the second input shaft is rotatably mounted on the plane of the tooling cover edge, and the upper end of the second input shaft has a hexagonal groove; the second input shaft is connected to the corresponding second shaft via gear transmission.

[0019] As a preferred embodiment, an adjustable pressure plate is installed on the two lower pressure plates, and a leaf spring is installed between the adjustable pressure plate and the two lower pressure plates.

[0020] Compared with existing technologies, the advantages of this invention are:

[0021] 1. The testing equipment designed in this invention, when connecting the tooling cover and the valve cover, has its structure connected by two external motors driving it uniformly, saving time and manpower.

[0022] 2. In this invention, the valve cover is placed on a conveyor during inspection. The conveyor transports the valve cover to a designated location for inspection, eliminating the need for frequent manual operation and reducing labor costs. Simultaneously, one robotic arm can install the tooling cover on one valve cover. During transport, pressure changes are tested. At the next robotic arm, a vision sensor observes the pressure gauge. If there is no pressure change, the tooling cover is removed from the conveyor belt and the valve cover is placed in the qualified product section. If there is a significant pressure change, the tooling cover is removed from the conveyor belt and the valve cover is placed in the unqualified product section. Afterwards, manual verification determines the next step. The observation of pressure changes over a certain period occurs during the transport phase, making full use of process time and achieving high efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall component appearance.

[0024] Figure 2 This is a schematic diagram of the installation of the support limit block.

[0025] Figure 3 This is a schematic diagram of the structure of a robotic arm.

[0026] Figure 4 This is a diagram showing the installation of the tightening components.

[0027] Figure 5 This is a schematic diagram of the tool cover structure.

[0028] Figure 6This is a schematic diagram of the distribution of the upper tensioning components.

[0029] Figure 7 These are the tightening components and a schematic diagram.

[0030] Figure 8 This is a schematic diagram showing the connection between the valve cover and the tooling cover.

[0031] Figure 9 This is a schematic diagram of the upper tensioning component structure.

[0032] Figure 10 This is a schematic diagram of the first screw installation.

[0033] Figure 11 This is a schematic diagram of the adjustment slider installation.

[0034] Figure 12 This is a schematic diagram of the second screw installation.

[0035] Figure 13 This is a schematic diagram of the connector block installation.

[0036] Figure 14 This is a schematic diagram of the adjustable pressure plate installation.

[0037] The labels in the diagram are as follows: 1. Conveying device; 2. Robotic arm one; 3. Support limit block; 4. Drive wrench; 5. Vacuum extraction pipe; 6. Gripping actuator; 7. Vacuum connection end; 8. Pressure gauge; 9. Gripping end; 10. Tooling cover; 11. Tightening assembly; 12. Switch valve; 13. First gear; 14. First rotating shaft; 15. First input shaft; 16. Second input shaft; 17. Second gear; 18. Second rotating shaft; 19. Valve chamber cover; 20. Universal joint; 21. Drive shaft; 22. First screw; 23. Upper pressure plate; 24. Adjusting slider; 25. Lower pressure plate; 26. Fixing block; 27. Connecting block; 28. Guide rail plate; 29. ​​Third gear; 30. Fourth gear; 31. Fifth gear; 32. Second screw; 33. Threaded sleeve; 34. First connecting rod; 35. Mounting slider; 36. Second connecting rod; 37. Adjustable pressure plate; 38. Leaf spring; 39. Robot arm II. Detailed Implementation

[0038] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following embodiments and drawings are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0039] A valve cover 19 testing device, such as Figure 1 As shown, it includes a conveying device 1, a robotic arm 2, a tooling cover 10, and a tightening assembly 11, wherein the valve cover 19 is placed on the conveying device 1, as shown. Figure 3As shown, the actuator of the robotic arm 2 is equipped with a vacuum extraction pipe 5 and a gripping actuator 6; a gripping end 9 is fixedly installed on the upper end of the tooling cover 10. During inspection, the robotic arm 2 uses the gripping actuator 6 installed on its actuator to clamp the gripping end 9 on the tooling cover 10 and lift the tooling cover 10; as shown... Figure 5 As shown, the tooling cover 10 has a vacuum connection end 7, and a switch valve 12 is installed on the vacuum connection end 7; the vacuum connection end 7 is connected to the vacuum pumping pipe 5 of the actuator end of the robotic arm 2; the upper end of the tooling cover 10 has a pressure gauge 8, such as... Figure 4 , 6 As shown in Figure 7, the tooling cover 10 and the valve cover 19 are connected by a tightening assembly 11. The pressure gauge 8 can observe the pressure changes in the cavity between the tooling cover 10 and the valve cover 19. Figure 3 As shown, two drive wrenches 4 are installed on the execution end of the first robotic arm 2. The tightening assembly 11 can be adjusted by the drive wrenches 4 to clamp the tool cover 10 and the valve cover 19 together. A second robotic arm 38 is installed on one side of the conveying device 1. The second robotic arm 38 is equipped with an air pump, which is used to blow air into the tool cover 10 and the valve cover 19 to make the pressure in the space between them the same as the outside pressure, so that the tool cover 10 and the valve cover 19 can be easily separated and opened.

[0040] The second robotic arm is structurally identical to the first robotic arm, except for the pump. The second robotic arm allows gas to enter between the valve chamber cover and the tooling cover via a pipe similar to the vacuum extraction pipe 5 on the first robotic arm. The vacuum extraction pipe 5 on the first robotic arm is connected to a vacuum pump.

[0041] During testing, the valve cover 19 is placed on the conveying device 1. As the valve cover 19 passes the robotic arm 2, the robotic arm 2 is controlled to pick up the tooling cover 10 and place it on the valve cover 19, so that the vacuum connection end 7 on the valve cover 19 is connected to the vacuum pumping pipe 5 at the execution end of the robotic arm 2. The two drive wrenches 4 are controlled to operate and control the tightening assembly 11 connecting the tooling cover 10 and the valve cover 19 to tighten the tooling cover 10 and the valve cover 19. Then, a vacuum is drawn into the cavity formed by the tooling cover 10 and the valve cover 19. Then, the vacuum connection end 7 is closed by the switch valve 12, and the change of the pressure gauge 8 is observed within a certain period of time to determine whether the airtightness of the valve cover 19 is qualified.

[0042] The robotic arm 2 of this invention is a multi-degree-of-freedom robotic arm 2, which is only schematic in the accompanying drawings; the vacuum pumping pipe 5, the drive wrench 4, and the gripping execution end 6 of the robotic arm 2, as well as the cooperation of these structures with the vacuum connection end 7, the first input shaft 15 and the second input shaft 16, and the gripping end 9 on the tooling cover 10, are all prior art, which are only schematic in the accompanying drawings.

[0043] In this invention, there can be multiple robotic arms 2, and each robotic arm 2 can inspect one valve cover 19 during inspection; the attached drawings only show a schematic of one robotic arm 2.

[0044] like Figure 2 As shown, two rows of support and limiting blocks 3 are symmetrically installed on the conveyor belt of the conveying device 1, with gaps between adjacent support and limiting blocks 3; the valve cover 19 is placed between the two rows of support and limiting blocks 3 and supported by them. When the conveyor belt changes to a semi-circular shape at both ends, the gaps between adjacent support and limiting blocks 3 will become V-shaped as the conveyor belt deforms, and the adjacent support and limiting blocks 3 will not affect each other due to the deformation of the conveyor belt.

[0045] like Figure 6 , 7 As shown in Figures 9 and 10, the tightening assembly 11 is composed of multiple tightening assembly 11 units.

[0046] like Figure 10 , 11 As shown, the tightening assembly 11 unit includes a first screw 22, an upper pressure plate 23, an adjusting slider 24, a lower pressure plate 25, a fixing block 26, a connecting block 27, a guide rail plate 28, a second screw 32, a threaded sleeve 33, and a mounting slider 35, wherein... Figure 8 , 9 As shown, two upper pressure plates 23 are fixedly installed on the fixed surface of the edge of the tooling cover 10, as... Figure 10 As shown, two guide rails 28 are symmetrically fixedly mounted on the two upper pressure plates 23, as follows: Figure 12 As shown, each of the two guide rail plates 28 has a sliding mounting slider 35, as indicated. Figure 13 As shown, the two mounting sliders 35 are connected by a connecting block 27, the lower side of which has an inclined surface; Figure 12 , 13 As shown, each mounting slider 35 is rotatably mounted with a threaded sleeve 33, and each threaded sleeve 33 is threadedly fitted with a second screw 32. The second screw 32 passes through the corresponding mounting slider 35 and is fixedly mounted with a first connecting rod 34. A lower pressure plate 25 is fixedly mounted on the first connecting rod 34. Two first connecting rods 34 are fixedly connected by multiple second connecting rods 36. The outer circumference of the threaded sleeve 33 has a toothed ring. A third gear 29 and a fourth gear 30 are coaxially rotatably mounted on the corresponding mounting slider 35, and the third gear 29 meshes with the toothed ring. A transmission shaft 21 is rotatably mounted on the corresponding mounting slider 35, and a fifth gear 31 is fixedly mounted on the transmission shaft 21, which meshes with the fourth gear 30. A fixing block 26 is fixedly mounted on the fixing surface of the edge of the tooling cover 10, as shown. Figure 11As shown, a first screw 22 is rotatably mounted on the fixed block 26, and an adjusting slider 24 is slidably mounted between two guide rails 28. The upper end face of the adjusting slider 24 has an inclined surface, and the adjusting slider 24 is in contact with the connecting block 27. The adjusting slider 24 is threadedly connected to the first screw 22. The second rotating shaft 18 is rotatably mounted on the fixed surface of the edge of the tooling cover 10, and the second rotating shaft 18 is connected to the first screw 22 through gear transmission.

[0047] When the transmission shaft 21 operates, it drives the fifth gear 31 to rotate. The rotation of the fifth gear 31 drives the fourth gear 30 to rotate, which in turn drives the third gear 29 to rotate. The rotation of the third gear 29 drives the gear ring to rotate, which in turn drives the threaded sleeve 33 to rotate. Since the threaded sleeve 33 is mounted on the corresponding mounting slider 35, the second screw 32 is driven to slide relative to the mounting slider 35 under the action of the thread when the threaded sleeve 33 rotates. The sliding of the second screw 32 drives the first connecting rod 34 to slide, which in turn drives the corresponding lower pressure plate 25 to slide. This controls whether the lower pressure plate 25 moves to the underside of the valve cover 19 for clamping or moves out from the underside of the valve cover 19, facilitating the opening of the tooling cover 10 and the valve cover 19. The invention uses a designed second connecting rod 36 to synchronize the two lower pressure plates 25.

[0048] When the second rotating shaft 18 is rotated, it will drive the first screw 22 to rotate. Since the first screw 22 is mounted on the fixed block 26, when the first screw 22 rotates, the adjusting slider 24, which is connected to the first screw 22 by the thread under the action of the thread, will slide relative to the two guide plates 28. The sliding of the adjusting slider 24 will press the connecting block 27 through the inclined surface, causing the connecting block 27 to move upward. The connecting block 27 will drive the two mounting sliders 35 to move upward. The mounting sliders 35 will drive the two lower pressure plates 25 to move upward through the two first connecting rods 34, connecting the tooling cover 10 and the valve cover 19.

[0049] like Figure 6 As shown, the transmission shaft 21 between adjacent tightening assembly 11 units is connected by a universal joint 20 and a first shaft 14. The first shaft 14 is a telescopic shaft with both ends fixedly mounted on two adjacent mounting sliders 35. The attached figure only shows a portion of the fixing method of the first shaft 14. The universal joint 20 and the first shaft 14 are arranged to ensure that the rotation between adjacent transmission shafts 21 is transmitted without affecting the independent movement of the lower pressure plate 25 in the tightening assembly 11 unit.

[0050] like Figure 6As shown, the tooling cover 10 has a square edge, and the four second rotating shafts 18 corresponding to the four edges are respectively connected by two second gears 17; the four first rotating shafts 14 corresponding to the four edges are respectively connected by two first gears 13. The second gears 17 connect the transmission shafts 21 in all the tightening assembly 11 units to drive and control them together; the first gears 13 connect the second rotating shafts 18 in all the tightening assembly 11 units to drive and control them together.

[0051] like Figure 6 As shown, the first input shaft 15 is rotatably mounted on one of the mounting sliders 35, and the upper end of the first input shaft 15 has a hexagonal groove; the first input shaft 15 is connected to the corresponding transmission shaft 21 through gear transmission. Driving the first input shaft 15 to rotate will drive the corresponding transmission shaft 21 to rotate, and the transmission shaft 21 can drive all the transmission shafts 21 to rotate through the universal joint 20, the first shaft 14, and the second gear 17.

[0052] like Figure 6 As shown, the second input shaft 16 is rotatably mounted on the plane of the edge of the tooling cover 10, and the upper end of the second input shaft 16 has a hexagonal groove; the second input shaft 16 is connected to the corresponding second rotating shaft 18 through gear transmission. Driving the second input shaft 16 to rotate will drive the corresponding second rotating shaft 18 to rotate, and the second rotating shaft 18 can drive all the second rotating shafts 18 to rotate through the first gear 13.

[0053] like Figure 14 As shown, adjustable pressure plates 36 are installed on the two lower pressure plates 25, and leaf springs 37 are installed between the adjustable pressure plates 36 and the two lower pressure plates 25. The adjustable pressure plates 36 can swing relative to the two lower pressure plates 25. When connecting the tooling cover 10 and the valve cover 19, the swing of the adjustable pressure plates 36 can be adjusted to adapt to the irregular mating surfaces on the tooling cover 10 and the valve cover 19. The upper pressure plate 23 and the lower pressure plates 25 of this invention are relatively long. During use, the sliding of the lower pressure plates 25 can be adjusted to ensure that the adjustable pressure plates 36 and the valve cover 19 are properly engaged, increasing the contact area. This invention can be applied to valve covers 19 of different shapes and sizes.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

[0055] Implementation: When using the equipment designed in this invention, firstly, control all the lower pressure plates 25 to move outward, allowing the lower side of the tooling cover 10 to be cleared, preventing interference between the tooling cover 10 and the valve cover 19 when they are connected; then, place the valve cover 19 on the conveying device 1. When the valve cover 19 passes the robot arm 2, control the robot arm 2 to pick up the tooling cover 10 and place it on the valve cover 19, with a shim placed between them beforehand; so that the vacuum connection end 7 on the valve cover 19 is connected to the vacuum suction pipe 5 of the robot arm 2; control the two drives The wrench 4 controls the tightening assembly 11 connecting the tooling cover 10 and the valve cover 19 to tighten the tooling cover 10 and the valve cover 19. The specific steps are as follows: First, the first input shaft 15 is driven to rotate by an external motor. The first input shaft 15 will drive the corresponding transmission shaft 21 to rotate. This transmission shaft 21 can drive all the transmission shafts 21 to rotate through the universal joint 20, the first shaft 14, and the second gear 17. The transmission shaft 21 will drive the fifth gear 31 to rotate. The rotation of the fifth gear 31 will drive the fourth gear 30 to rotate. The rotation of the fourth gear 30 will drive the third gear 29 to rotate. The third gear 29 will rotate... The rotating gear ring causes the threaded sleeve 33 to rotate. Since the threaded sleeve 33 is mounted on the corresponding mounting slider 35, the second screw 32 is driven to slide relative to the mounting slider 35 under the action of the threads when the threaded sleeve 33 rotates. The sliding of the second screw 32 causes the first connecting rod 34 to slide, which in turn causes the corresponding lower pressure plate 25 to slide, moving the lower pressure plate 25 to the underside of the valve cover 19. Then, an external motor drives the second input shaft 16 to rotate, which in turn drives the corresponding second rotating shaft 18 to rotate. This second rotating shaft 18, through the first gear 13, can... The second rotating shaft 18 drives all the second rotating shafts 18 to rotate, which in turn drives the first screw 22 to rotate. Since the first screw 22 is mounted on the fixed block 26, when the first screw 22 rotates, the adjusting slider 24, which is connected to the first screw 22 by the thread under the action of the thread, will slide relative to the two guide rail plates 28. The sliding of the adjusting slider 24 will press the connecting block 27 through the inclined surface, causing the connecting block 27 to move upward. The connecting block 27 drives the two mounting sliders 35 to move upward. The mounting sliders 35 drive the two lower pressure plates 25 to move upward through the two first connecting rods 34, connecting the tooling cover 10 and the valve cover 19.

[0056] Then, a vacuum is drawn into the cavity formed by the tooling cover 10 and the valve cover 19. After completion, the vacuum connection 7 is closed by controlling the switch valve 12, and the change in the pressure gauge 8 is observed within a certain period of time to determine whether the airtightness of the valve cover 19 is qualified. During the subsequent transport process, the pressure change is tested. At the next robotic arm, the pressure gauge is observed through a vision sensor installed on the robotic arm. If there is no change in pressure, the tooling cover is removed by the robotic arm and the valve cover is taken off the conveyor belt and placed in the qualified product area. If the pressure change is significant, the tooling cover is removed by the robotic arm and the valve cover is taken off the conveyor belt and placed in the unqualified product area. Afterwards, manual inspection is performed to determine the next process. During disassembly, air is blown into the tooling cover 10 and the valve cover 19 to equalize the pressure in the space between them with the outside pressure, making it easy to separate and open the tooling cover 10 and the valve cover 19.

[0057] The above observation of air pressure changes over a certain period of time occurred during the conveying stage, making full use of the process time and achieving high efficiency.

Claims

1. A valve cover testing device, characterized in that: It includes a conveying device, a robotic arm, a tooling cover, and a tightening assembly. The valve cover is placed on the conveying device. The robotic arm has a vacuum extraction pipe and a gripping end installed on its actuator end. The gripping end is fixedly installed on the upper end of the tooling cover. During inspection, the robotic arm uses the gripping end installed on its actuator end to clamp the gripping end on the tooling cover and lift it up. The tooling cover has a vacuum connection end, on which a switch valve is installed. The vacuum connection end is connected to the vacuum extraction pipe of the robotic arm's actuator end. The upper end of the tooling cover is equipped with a pressure gauge. After the tooling cover and the valve cover are connected, they are connected by a tightening assembly. The pressure gauge can observe the pressure change in the cavity between the tooling cover and the valve cover. Two drive wrenches are installed on the execution end of the first robotic arm. The tightening assembly can be adjusted by the drive wrenches to clamp the tooling cover and the valve cover together. A second robotic arm is installed on one side of the conveying device. The second robotic arm is equipped with an air pump, which is used to blow air into the tooling cover and the valve cover to open them. The tightening assembly is composed of multiple tightening assembly units; The tightening assembly unit includes a first screw, an upper pressure plate, an adjusting slider, a lower pressure plate, a fixing block, a connecting block, a guide rail plate, a second screw, a threaded sleeve, and an installation slider. Two upper pressure plates are fixedly mounted on the fixed surface of the tooling cover edge. Two guide rail plates are symmetrically fixedly mounted on the two upper pressure plates. An installation slider is slidably mounted inside each of the two guide rail plates. The two installation sliders are connected by a connecting block, the lower side of which has a bevel. A threaded sleeve is rotatably mounted on each installation slider, and a second screw is threadedly mounted on each threaded sleeve. The second screw passes through the corresponding installation slider and a first connecting rod is fixedly mounted thereon. A lower pressure plate is fixedly mounted on the first connecting rod. The fixing block is fixedly mounted on the fixed surface of the tooling cover edge. A first screw is rotatably mounted on the fixing block. The adjusting slider is slidably mounted between the two guide rail plates. The upper end face of the adjusting slider has a bevel, and the adjusting slider contacts and engages with the connecting block. The adjusting slider is threadedly connected to the first screw. The first screw between adjacent tightening component units is connected by gear transmission, and the second screw between adjacent tightening component units is connected by gear transmission. The outer circumference of the threaded sleeve has a toothed ring. The third gear and the fourth gear are coaxially rotatably mounted on the corresponding mounting slider, and the third gear meshes with the toothed ring. The transmission shaft is rotatably mounted on the corresponding mounting slider, and a fifth gear is fixedly mounted on the transmission shaft, which meshes with the fourth gear. The transmission shaft between the adjacent tightening component units is connected to the first shaft via a universal joint; the first shaft is a telescopic shaft and its two ends are respectively fixedly installed on two adjacent mounting sliders. The second rotating shaft is rotatably mounted on the fixed surface of the tool cover edge, and the second rotating shaft is connected to the first screw through gear transmission.

2. The valve cover testing device according to claim 1, characterized in that: Two rows of support and limiting blocks are symmetrically installed on the conveyor belt of the conveying device, with gaps between adjacent support and limiting blocks.

3. The valve cover testing device according to claim 1, characterized in that: The tool cover has a square edge, and the four second rotating shafts corresponding to the four edges are connected by two second gears respectively; the four first rotating shafts corresponding to the four edges are connected by two first gears respectively.

4. The valve cover testing device according to claim 1, characterized in that: Two first connecting rods in the same tightening assembly unit are fixedly connected by multiple second connecting rods.

5. The valve cover testing device according to claim 1, characterized in that: The first input shaft is rotatably mounted on one of the mounting sliders, and the upper end of the first input shaft has a hexagonal groove; the first input shaft is connected to the corresponding transmission shaft via gear transmission; the second input shaft is rotatably mounted on the plane of the edge of the tooling cover, and the upper end of the second input shaft has a hexagonal groove; the second input shaft is connected to the corresponding second shaft via gear transmission.

6. The valve cover testing device according to claim 1, characterized in that: An adjustable pressure plate is installed on the two lower pressure plates, and a leaf spring is installed between the adjustable pressure plate and the two lower pressure plates.

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