Clamping and conveying mechanism

Abstract

The utility model discloses a pinch mechanism which solves the technical problem that in the strip steel pinch process of a pinch roll mechanism in the prior art, strip steel is prone to being clamped into a gap between a turning plate and a lower fixing guide plate or a gap between the turning plate and the lower fixing guide plate, so that the pinch roll mechanism is blocked and shut down, and potential safety hazards are caused. The clamping and conveying mechanism comprises a clamping roller assembly, a turning plate body, an upper fixing guide plate, a lower fixing guide plate and a driving assembly. The length of the turning plate body in the strip steel running direction is not larger than the distance from the leading-out end of the clamping roller assembly to the leading-in end of the upper fixing guide plate, the action end of the driving assembly is in transmission connection with the turning plate body, and the driving assembly can drive the leading-out end of the turning plate body to act so that the leading-out end of the turning plate body can be connected with the upper fixing guide plate. Or the leading-out end of the turning plate body covers the leading-in end of the lower fixed guide plate, so that the strip steel can smoothly pass through the butt joint between the turning plate body and the upper fixed guide plate and the butt joint between the turning plate body and the lower fixed guide plate, and the situation of machine halt caused by plate clamping is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of metallurgical machinery, and particularly relates to a pinch mechanism. BACKGROUND

[0002] The pinch roll mechanism is a device for clamping and feeding metal plates, strips, tubes, rods and the like.

[0003] The gap between the end of the turnover plate and the upper fixed guide plate and the lower fixed guide plate in the prior art pinch roll mechanism is too large. During the process of clamping and feeding the strip steel, the head of the strip steel is easily clamped into the gap between the turnover plate and the upper fixed guide plate or the gap between the turnover plate and the lower fixed guide plate when moving to the outlet end of the pinch roll mechanism, which causes the pinch roll mechanism to be clamped and stopped, and brings great safety hazards to production and production safety. Therefore, it is an urgent technical problem for those skilled in the art to invent a pinch roll structure which can effectively avoid clamping and stopping. SUMMARY

[0004] To solve the above technical problems, the application provides a pinch mechanism to solve the technical problem that the pinch roll mechanism in the prior art is easily clamped and stopped during the process of clamping and feeding the strip steel, which causes safety hazards.

[0005] The technical scheme adopted to achieve the purpose of the application is as follows:

[0006] A pinch mechanism comprises:

[0007] A pinch roll assembly for clamping and feeding strip steel;

[0008] A turnover plate body located on the outlet side of the pinch roll assembly, the lead-in end of the turnover plate body being connected with the lead-out end of the pinch roll assembly;

[0009] An upper fixed guide plate and a lower fixed guide plate, both located on the side of the turnover plate body away from the pinch roll assembly, the upper fixed guide plate and the lower fixed guide plate being spaced apart along the height direction, the length of the turnover plate body along the running direction of the strip steel being not greater than the distance from the lead-out end of the pinch roll assembly to the lead-in end of the upper fixed guide plate;

[0010] A driving assembly for driving the turnover plate body to act, so as to switch the turnover plate body between a first position and a second position;

[0011] The guide-out end of the turning plate body is located at a height greater than that of the guide-in end of the upper fixed guide plate, so that the turning plate body and the upper fixed guide plate form a first guide platform for the strip steel to pass through; and the guide-out end of the turning plate body covers the guide-in end of the lower fixed guide plate, so that the turning plate body and the lower fixed guide plate form a second guide platform for the strip steel to pass through.

[0012] In order to better realize the present application, the upper and lower surfaces of the turning plate body are respectively working surfaces and mounting surfaces, a receiving groove is arranged at the junction of the end surface of the guide-out end of the turning plate body and the mounting surface, and the guide-in end of the lower fixed guide plate is located in the receiving groove when the guide-out end of the turning plate body is connected with the guide-in end of the lower fixed guide plate.

[0013] In order to better realize the present application, the junction of the end surface of the guide-out end of the turning plate body and the working surface is chamfered.

[0014] In order to better realize the present application, the pinch roll assembly further comprises a pinch roll body.

[0015] The pinch roll assembly, the turning plate body, the upper fixed guide plate, the lower fixed guide plate and the driving assembly are arranged in the pinch roll body.

[0016] The pinch roll assembly comprises an upper pinch roll and a lower pinch roll, the upper pinch roll is located above the lower pinch roll, and the minimum distance between the outer side wall of the upper pinch roll and the outer side wall of the lower pinch roll is less than or equal to the thickness of the strip steel.

[0017] The inside of the pinch roll body is provided with a swing arm, the fixed end of the swing arm is hinged in the inside of the pinch roll body, the rotation axis of the swing arm coincides with the rotation axis of the lower pinch roll, the action end of the driving assembly is hinged with the free end of the swing arm, and the turning plate body is arranged on the swing arm.

[0018] In order to better realize the present application, the inside of the pinch roll body is provided with a swing arm, the fixed end of the swing arm is hinged in the inside of the pinch roll body, the rotation axis of the swing arm coincides with the rotation axis of the lower pinch roll, the action end of the driving assembly is hinged with the free end of the swing arm, and the turning plate body is arranged on the swing arm.

[0019] The mounting surface is provided with a mounting plate, the plane of the mounting plate is parallel to the plane of the fixing seat, the mounting plate is provided with a second through hole, the flap body is slidingly arranged on the swing arm along the length direction of the swing arm, and the flap body is fixed by a lock bolt penetrating through the first through hole and the second through hole and connected with a nut, and an adjusting gasket is arranged between the mounting plate and the fixing seat.

[0020] In order to better realize the present application, the leading end of the flap body is provided with a matching inclined surface, the distance between the side of the matching inclined surface close to the working surface and the leading end of the flap body is greater than the distance between the side of the matching inclined surface close to the mounting surface and the leading end of the flap body.

[0021] In order to better realize the present application, the leading end of the flap body is provided with a guiding inclined surface, one side of the guiding inclined surface is connected with the working surface, the other side of the guiding inclined surface is connected with the matching inclined surface, and the side of the guiding inclined surface away from the working surface is inclined to the direction of the mounting surface.

[0022] In order to better realize the present application, the angle between the guiding inclined surface and the working surface is 5°.

[0023] In order to better realize the present application, the connecting part of the guiding inclined surface and the matching inclined surface is chamfered.

[0024] In order to better realize the present application, the driving assembly includes a hydraulic cylinder and a transmission rod, and the telescopic end of the hydraulic cylinder is drivingly connected with the flap body through the transmission rod.

[0025] According to the above technical solution, the length of the flap body in the pinch mechanism along the running direction of the strip steel is not greater than the distance from the leading end of the upper fixed guide plate to the leading end of the lower fixed guide plate, when the driving assembly drives the flap body to switch to the first position, the strip steel can smoothly pass through the joint of the leading end of the flap body and the leading end of the upper fixed guide plate, and when the driving assembly drives the flap body to switch to the second position, the leading end of the flap body covers the leading end of the lower fixed guide plate, eliminating the gap between the flap body and the lower fixed guide plate in the running direction of the strip steel, so that the strip steel can smoothly pass through the joint of the flap body and the lower fixed guide plate, to avoid the situation of carding and stopping, thereby effectively reducing the safety hidden trouble of the pinch mechanism in the production process. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structure diagram of the connection between the flap body and the lower fixed guide plate in the pinch mechanism of the present application.

[0027] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0028] Figure 3 This is a schematic diagram of the structure of a clamping mechanism according to this application when the flap body is connected to the upper fixed guide plate;

[0029] Figure 4 This is a schematic diagram of the structure of the flap body in a clamping mechanism according to this application;

[0030] Figure 5 This is a side view of the flap body in a clamping mechanism according to this application;

[0031] Figure 6 This is a schematic diagram of the inlet end of the flap body in a clamping mechanism according to this application;

[0032] Figure 7 This is a schematic diagram of the structure of a clamping mechanism in this application when the swing arm and the flap body are engaged.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-Clamping body, 11-Upper clamping roller, 12-Lower clamping roller, 13-Upper fixed guide plate, 14-Lower fixed guide plate;

[0035] 2-Flip plate body, 21-Receiving groove, 22-Fitting slope, 23-Guide slope, 24-Mounting plate;

[0036] 3-Swing arm, 31-Fixed seat;

[0037] 4-Adjusting shims;

[0038] 5-Drive assembly; 51-Hydraulic cylinder; 52-Transmission rod. Detailed Implementation

[0039] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] In the embodiments of this application, such as Figures 1 to 7 As shown, the clamping mechanism includes a clamping roller assembly, a flip plate body 2, an upper fixed guide plate 13, a lower fixed guide plate 14, and a drive assembly 5, wherein,

[0041] The pinch roll assembly can pinch and feed the strip steel, causing the strip steel to run in one direction;

[0042] See Figure 4, the flip plate body 2 is a plate structure, the upper and lower surfaces of the flip plate body 2 are respectively a working surface and a mounting surface, the two ends of the flip plate body 2 are respectively an import end and an export end, the flip plate body 2 is mounted on the outlet side of the pinch roll assembly through the mounting surface thereof, and the import end of the flip plate body 2 is connected with the export end of the pinch roll assembly; it is worth noting that the import end of the flip plate body 2 does not contact the pinch roll assembly and the spacing is small, and the length of the flip plate body 2 along the running direction of the strip is always tangent to the circumferential outer wall of the lower pinch roll 12 in the pinch roll assembly, which can ensure that the strip can smoothly pass through the gap between the pinch roll assembly and the flip plate body 2 without affecting the normal operation of the pinch roll assembly;

[0043] The driving end of the driving assembly 5 is in transmission connection with the flip plate body 2, for driving the flip plate body 2 to switch between the first position and the second position, so that the export end of the flip plate body 2 switches between the two states of being connected with the upper fixed guide plate 13 and being connected with the lower fixed guide plate 14; and when the flip plate body 2 is located at the first position, the height of the export end of the flip plate body 2 is greater than the height of the import end of the upper fixed guide plate 13, so that the flip plate body 2 and the upper fixed guide plate 13 form a first guide platform for the strip to pass through; when the flip plate body 2 is located at the second position, the export end of the flip plate body 2 covers the import end of the lower fixed guide plate 14, so that the flip plate body 2 and the lower fixed guide plate 14 form a second guide platform for the strip to pass through.

[0044] When the export end of the flip plate body 2 is connected with the import end of the lower fixed guide plate 14, the head of the strip sent by the pinch roll assembly will fall on the working surface of the flip plate body 2 and move along the second guide platform;

[0045] And when the head of the strip moves to the export end of the flip plate body 2, since the gap between the flip plate body 2 and the lower fixed guide plate 14 in the running direction of the strip is covered by the export end of the flip plate body 2, referring to Figure 1 and Figure 2 , the head of the strip can smoothly fall on the lower fixed guide plate 14 through the export end of the flip plate body 2, avoiding the occurrence of the situation of strip jamming and shutdown, thereby effectively reducing the safety hidden trouble of the pinch sending mechanism in the production process.

[0046] It is worth noting that the length of the flip plate body 2 along the running direction of the strip is less than or equal to the spacing between the export end of the pinch roll assembly and the import end of the upper fixed guide plate 13, so that the flip plate body 2 can be smoothly connected with the upper fixed guide plate 13 under the driving of the driving assembly 5, so that the strip can be sent to the upper fixed guide plate 13 through the flip plate body 2, and sent to the designated position or equipment through the upper fixed guide plate 13.

[0047] To avoid the strip getting stuck in the gap between the outlet end of the flap body 2 and the upper fixed guide plate 13, the height of the outlet end of the flap body 2 can be adjusted by the drive assembly 5 when the flap body 2 is connected to the inlet end of the upper fixed guide plate 13, so that the height of the outlet end of the flap body 2 is greater than the height of the inlet end of the upper fixed guide plate 13. Figure 3 As shown; when the head of the strip moves out from the guide end of the flip plate body 2, the head of the strip will fall under the action of gravity. At the same time, the clamping roller assembly continuously clamps the strip, so that the head of the strip directly crosses the gap between the guide end of the flip plate body 2 and the upper fixed guide plate 13 during the falling process and falls smoothly onto the upper fixed guide plate 13, avoiding the occurrence of plate jamming and machine stoppage.

[0048] In some embodiments, a receiving groove 21 is provided at the connection between the end face of the leading end of the flap body 2 and the mounting surface of the flap body 2, such as... Figure 5 As shown, when the outlet end of the flap body 2 is connected to the inlet end of the lower fixed guide plate 14, the inlet end of the lower fixed guide plate 14 is located in the receiving groove 21. (See Figure 2) Figure 2 The inclusion groove 21 reduces the height difference between the working surface of the flap body 2 and the upper end surface of the lower fixed guide plate 14, making the strip feeding more stable. Preferably, the connection between the end face of the flap body 2 at the outlet end and the working surface is rounded, so that the passing strip can fall more smoothly onto the lower fixed guide plate 14, further improving the stability of strip feeding.

[0049] In some embodiments, the drive assembly 5 includes a hydraulic cylinder 51 and a transmission rod 52, wherein the telescopic end of the hydraulic cylinder 51 is connected to the flap body 2 via the transmission rod 52. Preferably, the transmission rod 52 includes a "V"-shaped swing rod and an arc-shaped push rod, see [reference needed]. Figure 1 and Figure 3 The middle part of the swing rod is hinged inside the clamping body 1, and the opening of the swing rod faces downward. One end of the swing rod is connected to the actuating end of the hydraulic cylinder 51, and the other end of the swing rod is hinged to the push rod. The end of the push rod away from the swing rod is hinged to the flip plate body 2.

[0050] When the extension end of the hydraulic cylinder 51 extends, it pushes the swing rod to rotate around its hinge point. The swing rod then drives the push rod to move the flap body 2 towards the upper fixed guide plate 13, allowing the outlet end of the flap body 2 to engage with the inlet end of the upper fixed guide plate 13. This switches the flap body 2 to the first position. (See [reference]). Figure 3 ;

[0051] When the retracting end of the hydraulic cylinder 51 is retracted, the retracting end of the hydraulic cylinder 51 will pull the swing lever to rotate around its hinge, and the swing lever will pull the push rod to pull the flap body 2 to move towards the upper fixed guide plate 13, so that the leading end of the flap body 2 can be connected with the leading end of the lower fixed guide plate 14, that is, the flap body 2 is switched to the second position, see Figure 1 .

[0052] In some embodiments, the pinch mechanism further comprises a pinch body 1, as shown in Figure 1 and 7 ; wherein,

[0053] The pinch roller assembly, the flap body 2, the upper fixed guide plate 13, the lower fixed guide plate 14 and the driving assembly 5 are all arranged in the pinch body 1;

[0054] The pinch roller assembly comprises an upper pinch roller 11 and a lower pinch roller 12, both of which are rotatably arranged in the pinch body 1, and the upper pinch roller 11 is above the lower pinch roller 12, and the minimum distance between the outer side wall of the upper pinch roller 11 and the outer side wall of the lower pinch roller 12 is less than or equal to the thickness of the strip steel, so as to pinch the strip steel by friction;

[0055] The fixed end of the swing arm 3 is hinged in the pinch body 1, and the rotation axis of the swing arm 3 coincides with the rotation axis of the lower pinch roller 12, the action end of the driving assembly 5 is hinged with the free end of the swing arm 3, and the flap body 2 is arranged on the swing arm 3, and the position of the flap body 2 can be adjusted by rotating the free end of the swing arm 3 around its rotation axis driven by the action end of the driving assembly 5, so that the leading end of the flap body 2 can be connected with the leading end of the upper fixed guide plate 13 or the leading end of the lower fixed guide plate 14, thereby completing the switching between the first position and the second position.

[0056] In some embodiments, the swing arm 3 is provided with a fixed seat 31, see Figure 7 , and the fixed seat 31 is provided with a first through hole, and the axis of the first through hole is parallel to the length direction of the swing arm 3;

[0057] The mounting surface is provided with a mounting plate 24, see Figure 4 and Figure 5 , the plane where the mounting plate 24 is located is parallel to the plane where the fixed seat 31 is located, and the mounting plate 24 is provided with a second through hole;

[0058] In the installation of the flap body 2, the flap body 2 can be erected on the swing arm 3, and the first and second through holes are sequentially locked by the locking bolt and the nut to realize the fixation of the flap body 2. Preferably, the adjusting washer 4 can be added between the fixing seat 31 and the mounting plate 24 to adjust the gap between the leading end of the flap body 2 and the lower pinch roll 12. Specifically, if there is no gap between the leading end of the flap body 2 and the lower pinch roll 12, that is, the leading end of the flap body 2 contacts the circumferential sidewall of the lower pinch roll 12, the lower pinch roll 12 and the flap body 2 will rub during the working process of the pinch mechanism, resulting in wear of the lower pinch roll 12 and the flap body 2. At this time, the thickness of the adjusting washer 4 can be increased between the fixing seat 31 and the mounting plate 24 to move the flap body 2 away from the lower pinch roll 12 until the gap between the leading end of the flap body 2 and the lower pinch roll 12 meets the working requirements.

[0059] If the gap between the leading end of the flap body 2 and the lower pinch roll 12 is too large, the head of the strip steel can be clamped into the gap between the leading end of the flap body 2 and the lower pinch roll 12 during the working process of the pinch mechanism, resulting in the pinch mechanism being clamped and stopped. At this time, the thickness of the adjusting washer 4 between the fixing seat 31 and the mounting plate 24 can be reduced to move the flap body 2 closer to the lower pinch roll 12 until the gap between the leading end of the flap body 2 and the lower pinch roll 12 meets the working requirements.

[0060] In some embodiments, the leading end of the flap body 2 is provided with a fitting slope 22, as shown in Figure 6 The distance between the side of the fitting slope 22 close to the working surface and the leading end of the flap body 2 is greater than the distance between the side of the fitting slope 22 close to the mounting surface and the leading end of the flap body 2. The fitting slope 22 can avoid the friction between the leading end of the flap body 2 and the lower pinch roll 12, ensuring the production safety of the pinch mechanism and reducing the wear of the equipment. Preferably, the angle between the fitting slope 22 and the mounting surface is 45°.

[0061] In some embodiments, the leading end of the flap body 2 is provided with a guide slope 23 for guiding the strip steel, as shown in Figure 6 The guide slope 23 can further avoid the strip steel being clamped in the gap between the leading end of the flap body 2 and the lower pinch roll 12, so that the strip steel passing through the pinch roll assembly can smoothly enter the flap body 2.

[0062] Specifically, one side of the guide slope 23 is connected with the working surface, the other side of the guide slope 23 is connected with the abutting slope 22, and the side of the guide slope 23 away from the working surface is inclined to the direction of the installation surface; when the strip steel passing through the pinch roll assembly falls to the guide slope 23, the pinch roll assembly will continuously pinch and feed the strip steel, so that the head of the strip steel moves along the guide slope 23 and enters the working surface of the turning plate body 2, avoiding the situation that the head of the strip steel directly abuts against the working surface of the turning plate body 2 to cause the strip steel to be clamped, so as to ensure the stability of the pinch and feed mechanism. Preferably, the included angle between the guide slope 23 and the working surface is 5°.

[0063] In some embodiments, the connection between the guide slope 23 and the abutting slope 22 is chamfered.

[0064] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0065] 1) The length of the turning plate body 2 in the pinch and feed mechanism along the running direction of the strip steel is not greater than the distance from the leading end of the pinch roll assembly to the trailing end of the upper fixed guide plate 13; when the driving assembly 5 drives the turning plate body 2 to switch to the first position, the strip steel can smoothly pass through the joint between the trailing end of the turning plate body 2 and the leading end of the upper fixed guide plate 13; and when the driving assembly 5 drives the turning plate body 2 to switch to the second position, the trailing end of the turning plate body 2 covers the leading end of the lower fixed guide plate 14, eliminating the gap between the turning plate body 2 and the lower fixed guide plate 14 in the running direction of the strip steel, so that the strip steel can smoothly pass through the joint between the turning plate body 2 and the leading end of the lower fixed guide plate 14, avoiding the situation of clamping and stopping, thereby effectively reducing the safety hazards of the pinch and feed mechanism in the production process.

[0066] 2) The joint between the end surface of the trailing end of the turning plate body 2 and the working surface is chamfered, so that the passing strip steel can more smoothly fall onto the lower fixed guide plate 14, and the pinch and feed of the strip steel is more stable.

[0067] 3) The leading end of the turning plate body 2 is provided with a guide slope 23 for guiding the strip steel, so as to further avoid the situation that the strip steel is clamped between the leading end of the turning plate body 2 and the lower pinch roll 12, and the strip steel passing through the pinch roll assembly can smoothly enter the turning plate body 2.

[0068] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the present application.

[0069] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A pinch mechanism, characterized by, The utility model relates to a strip steel guiding device, including: A pinch roll assembly is used for clamping strip steel; A turnover plate body (2) is located at the outlet side of the pinch roll assembly, and the leading-in end of the turnover plate body (2) is connected with the leading-out end of the pinch roll assembly; An upper fixed guide plate (13) and a lower fixed guide plate (14) are located at the side of the turnover plate body (2) away from the pinch roll assembly, the upper fixed guide plate (13) and the lower fixed guide plate (14) are arranged at intervals along the height direction, and the length of the turnover plate body (2) along the strip steel running direction is not greater than the distance from the leading-out end of the pinch roll assembly to the leading-in end of the upper fixed guide plate (13); A driving assembly (5) is used for driving the turnover plate body (2) to act, so that the turnover plate body (2) is switched between a first position and a second position; When the turnover plate body (2) is located at the first position, the height of the leading-out end of the turnover plate body (2) is greater than the height of the leading-in end of the upper fixed guide plate (13), so that the turnover plate body (2) and the upper fixed guide plate (13) form a first guide platform for strip steel to pass through; when the turnover plate body (2) is located at the second position, the leading-out end of the turnover plate body (2) covers the leading-in end of the lower fixed guide plate (14), so that the turnover plate body (2) and the lower fixed guide plate (14) form a second guide platform for strip steel to pass through.

2. The pinch mechanism of claim 1, wherein, The upper and lower surfaces of the turnover plate body (2) are respectively a working surface and a mounting surface, a receiving groove (21) is arranged at the connection between the end face of the leading-out end of the turnover plate body (2) and the mounting surface, and when the leading-out end of the turnover plate body (2) is connected with the leading-in end of the lower fixed guide plate (14), the leading-in end of the lower fixed guide plate (14) is located in the receiving groove.

3. The pinch mechanism of claim 2, wherein, The connection between the end face of the leading-out end of the turnover plate body (2) and the working surface is chamfered.

4. The pinch mechanism of claim 2, wherein, The utility model also includes a pinch roll main body (1); The pinch roll assembly, the turnover plate body (2), the upper fixed guide plate (13), the lower fixed guide plate (14) and the driving assembly (5) are arranged in the pinch roll main body (1); The pinch roll assembly includes an upper pinch roll (11) and a lower pinch roll (12), the upper pinch roll (11) is located above the lower pinch roll (12), and the minimum distance between the outer side wall of the upper pinch roll (11) and the outer side wall of the lower pinch roll (12) is less than or equal to the thickness of the strip steel; The inside of the pinch roll main body (1) is provided with a swing arm (3), the fixed end of the swing arm (3) is hinged in the inside of the pinch roll main body (1), the rotation axis of the swing arm (3) coincides with the rotation axis of the lower pinch roll (12), the action end of the driving assembly (5) is hinged with the free end of the swing arm (3), and the turnover plate body (2) is arranged on the swing arm (3).

5. The pinch mechanism of claim 4, wherein, A fixed seat (31) is arranged on the side wall of the swing arm (3), and a first through hole is arranged on the fixed seat (31), and the axis of the first through hole is parallel to the length direction of the swing arm (3). The installation surface is provided with an installation plate (24), a plane where the installation plate (24) is located is parallel to a plane where the fixing base (31) is located, the installation plate (24) is provided with a second through hole, the flap body (2) is slidingly arranged on the swing arm (3) along a length direction of the swing arm (3), and is fixed by a lock bolt, a nut and connection of the first through hole and the second through hole, and an adjusting gasket (4) is arranged between the installation plate (24) and the fixing base (31).

6. The pinch mechanism according to any one of claims 2 to 5, wherein, The leading end of the flap body (2) is provided with a fitting slope (22), a distance between the side of the fitting slope (22) close to the working surface and the leading end of the flap body (2) is greater than a distance between the side of the fitting slope (22) close to the installation surface and the leading end of the flap body (2).

7. The pinch mechanism of claim 6, wherein, The leading end of the flap body (2) is provided with a guide slope (23), one side of the guide slope (23) is connected with the working surface, the other side of the guide slope (23) is connected with the fitting slope (22), and the side of the guide slope (23) far away from the working surface is inclined to the direction where the installation surface is located.

8. The pinch mechanism of claim 7, wherein, An included angle between the guide slope (23) and the working surface is 5°.

9. The pinch mechanism of claim 8, wherein, The connecting position between the guide slope (23) and the fitting slope (22) is chamfered.

10. The pinch mechanism of claim 1, wherein, The driving assembly (5) comprises a hydraulic cylinder (51) and a transmission rod (52), and the telescopic end of the hydraulic cylinder (51) is in transmission connection with the flap body (2) through the transmission rod (52).

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