Welding tool for S arm of hydraulic loader and using method

Abstract

The invention provides a hydraulic loader S arm welding tool and a using method.The tool comprises two side plate containing frames, a shaft sleeve containing frame and two positioning hydraulic systems, the shaft sleeve containing frame comprises a shaft sleeve containing table and a sliding way, a containing groove is formed in the shaft sleeve containing table, the containing groove is an arc-shaped groove matched with the side wall of a rotating shaft sleeve in shape, and the sliding way is matched with the side wall of the rotating shaft sleeve; the slideway is located above the shaft sleeve placing table, one end of the slideway is located on one side of the placing groove, and the slideway is obliquely arranged; the two side plate containing frames are located on the two sides of the shaft sleeve containing table correspondingly and symmetrically distributed, and the tops of the side plate containing frames are used for containing S-arm side plates. The two positioning hydraulic systems are located on the sides, away from the shaft sleeve containing table, of the two side plate containing frames correspondingly. Each positioning hydraulic system comprises two positioning oil cylinders and a pushing oil cylinder. By means of the S-arm welding device, it can be guaranteed that the rotating shaft sleeve and the S-arm side plate are accurate in position during welding, it is guaranteed that the welded and formed S-arm meets the requirement, the S-arm welding forming efficiency is improved, and the machining cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a hydraulic loader S-arm welding tool and a use method thereof. Background Art

[0002] As a kind of engineering machinery, the loader includes a working device mainly composed of a bucket, an H arm and an S arm. Figure 7 The working device is mainly used to shovel bulk materials such as soil, sand, lime, coal, etc. It can also perform light shoveling operations on ore, hard soil, etc.

[0003] The S arm is connected to the H arm of the loader working device through the S arm support, which is welded to the cross beam of the H arm. The S arm can rotate around the core shaft of the S arm support during operation. The S arm is a welded component consisting of two S arm side plates and a rotating sleeve. The rotating sleeve is the component that allows the S arm to rotate around the core shaft of the S arm support. Figure 6 and Figure 8 As shown, the S-arm side plate is provided with a cylinder shaft hole, a rotation hole and a connecting rod shaft hole. The cylinder shaft hole and the connecting rod shaft hole are respectively located at the two ends of the S-arm side plate, and are respectively used to connect with the cylinder that drives the S-arm to flip and the connecting rod that drives the bucket to flip. The rotation hole is coaxial with the rotating sleeve and is used to connect with the core shaft supported by the S-arm. In order to ensure that the S-arm can be used normally for loading work, the welded S-arm must ensure that the positions of the two S-arm side plates correspond, the positions of the holes that play the same role on the two S-arm side plates correspond, and the welding position of the rotating sleeve is accurate. In order to ensure that the welded S-arm meets the technical requirements and improve the welding efficiency, a hydraulic loader S-arm welding tool and a method of use are required. Summary of the invention

[0004] In order to solve the problems in the background technology, the present invention proposes a hydraulic loader S-arm welding tool, including a side plate placement frame, a sleeve placement frame and a positioning hydraulic system, the sleeve placement frame includes a sleeve placement table and a slideway for placing a rotating sleeve, the sleeve placement table is provided with a placement groove for placing a rotating sleeve, the placement groove is an arc groove matching the shape of the side wall of the rotating sleeve, the axial dimension of the placement groove is smaller than the axial dimension of the rotating sleeve, the slideway is located above the sleeve placement table, one end of the slideway is located on one side of the placement groove, and the position of the other end of the slideway is higher than the position of one end of the slideway close to the placement groove; There are two side panel placement racks, which are respectively located on both sides of the shaft sleeve placement platform and are symmetrically distributed, and the top of the side panel placement rack is used to place the S-arm side panel; There are two positioning hydraulic systems, which are respectively located on one side of the two side plate placement racks away from the sleeve placement platform. The positioning hydraulic system includes two positioning cylinders and a pushing cylinder for pushing the S-arm side plate; After the S-arm side plate is placed on the side plate placement rack, the telescopic rods of the two positioning cylinders are respectively coaxial with the cylinder shaft hole and the connecting rod shaft hole on the S-arm side plate, and the placement groove is coaxial with the rotation hole on the S-arm side plate. Preferably, a receiving groove matching the shape of the bottom of the S-arm side panel is provided on the top of the side panel placement rack.

[0005] Preferably, a stop mechanism for controlling the falling / stopping of the rotating sleeve on the slide is provided at one end of the slide close to the placement groove.

[0006] Preferably, the delivery and stop mechanism includes a first delivery and stop plate, a second delivery and stop plate and a gear, a mounting plate is fixed above the slide, the gear is rotatably set on the mounting plate through a rotating shaft, the first delivery and stop plate is located on the side of the gear close to the sleeve placement table, and the second delivery and stop plate gear is located on the side away from the sleeve placement table, the first delivery and stop plates and the second delivery and stop plates are both provided with racks meshing with the gears on the sides close to the gears, one end of the first delivery and stop plates are both slidably connected to the mounting plate, the spacing between the first delivery and stop plates is not less than the diameter of the rotating sleeve and less than 1.5 times the diameter of the rotating sleeve, and the gear is driven to rotate by a driving mechanism.

[0007] Preferably, the driving mechanism comprises a stop-feed oil cylinder and a connecting rod, the stop-feed oil cylinder is fixedly connected to the mounting plate, the output end of the stop-feed oil cylinder is hinged to one end of the connecting rod, and the other end of the connecting rod is connected to the rotating shaft.

[0008] Preferably, baffles are provided on both sides of the slideway.

[0009] Preferably, the output end of the pushing oil cylinder is connected with a push plate, and the push plate corresponds to the position of the S-arm side plate.

[0010] A method for using a hydraulic loader S-arm welding tool comprises the following steps: S1. Place multiple S-arm side plates on two side plate placement racks respectively, and place multiple rotating sleeves on the slide along the length direction. In the initial state, the bottom of the first stop plate is close to the slide, and the bottom of the second stop plate is far away from the slide. The multiple rotating sleeves on the slide are located on the side of the first stop plate away from the sleeve placement platform, and the first stop plate limits the rotating sleeves on the slide; S2, start the driving mechanism, the driving mechanism drives the gear to rotate, the gear drives the two stop plates to move through the rack, the first stop plate is lifted, a rotating sleeve on the slideway close to the sleeve placement table loses its restriction and rolls into the placement groove, at the same time, the second stop plate moves down, and the second stop plate limits the remaining rotating sleeves on the slideway; S3, start the positioning cylinders, and the two positioning cylinders on each side extend the telescopic rod to the cylinder shaft hole and the connecting rod shaft hole of the S-arm side plate respectively, and then start the pushing cylinders, and the two pushing cylinders push and press the S-arm side plates on both sides onto the two sides of the rotating sleeve respectively; S4. Start the welding robot to weld the two S-arm side plates and the rotating sleeve into one body to form the S-arm of the loader.

[0011] Preferably, step S3 includes: the first stop plate is lifted, the second stop plate is moved downward, and after a rotating sleeve on the slide close to the sleeve placement table rolls down to the placement groove, the driving mechanism drives the gear to reverse, and the gear drives the second stop plate to lift, and the first stop plate is moved downward, so that the next rotating sleeve is located between the first stop plate and the second stop plate.

[0012] The beneficial effects of the present invention are: The present invention limits the position of the S-arm side plate by symmetrically arranged positioning cylinders, and the telescopic rods of each positioning cylinder are respectively coaxial with the cylinder shaft hole of the S-arm side plate and the connecting rod shaft hole of the S-arm side plate, thereby ensuring the accurate position of the two S-arm side plates of the S-arm. At the same time, the placement groove can position the rotating sleeve located therein, ensuring the accurate position of the rotating sleeve, thereby ensuring that the welded S-arm meets the requirements.

[0013] The present invention can pre-place multiple S-arm side plates and multiple rotating sleeves without frequent loading. The pushing cylinder of the present invention not only moves the two S-arm side plates to the position to be processed, but also makes the S-arm side plates close to the rotating sleeves, thereby fixing the position of the S-arm side plates and facilitating welding. At the same time, the present invention pre-places the rotating sleeves by tilting the slideway, and the rotating sleeves can enter the placement groove by gravity potential energy, without the need to set a driving mechanism, thus saving costs. The delivery and stopping mechanism can enable the rotating sleeves to enter the placement groove one by one, thereby ensuring the orderliness of the rolling of the rotating sleeves. The present invention cooperates with the welding robot to improve the efficiency of S-arm welding and reduce processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 for Figure 1 A magnified view of the structure at center; Figure 4 It is a top view of the overall structure of the present invention; Figure 5 It is a schematic diagram of the structure of the side plate placement rack and the shaft sleeve placement rack of the present invention; Figure 6 It is a schematic diagram of the S-arm side panel structure; Figure 7 It is a schematic diagram of the structure of the loader working device; Figure 8 This is a schematic diagram of the loader S-arm structure.

[0015] Numbers in the figure: 1. Side panel placement rack; 2. Slide; 3. S-arm side panel; 31. Cylinder shaft hole; 32. Rotating hole; 33. Connecting rod shaft hole; 4. Rotating sleeve; 5. Positioning cylinder; 6. Pushing cylinder; 7. Gear; 8. Rack; 9. Second delivery and stop plate; 10. First delivery and stop plate; 11. Delivery and stop cylinder; 12. Connecting rod; 13. Mounting plate; 14. Baffle; 15. Sleeve placement table; 16. Placement slot; 17. Push plate. DETAILED DESCRIPTION

[0016] In order to make the present invention clearer and more understandable, the technical solution of the present invention is further described in detail below in combination with the accompanying drawings and embodiments. It should be understood that the given embodiment is only one of the implementation methods and does not represent all embodiments.

[0017] In this article, the terms "inside, outside, up, down" and so on are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, they cannot be understood as an absolute limitation on the scope of protection.

[0018] Combined with Figure 1 -Attached Figure 6 , a hydraulic loader S-arm welding tool, including a side plate placement frame 1, a sleeve placement frame and a positioning hydraulic system, the sleeve placement frame includes a sleeve placement platform 15 and a slideway 2 for placing a rotating sleeve 4, the sleeve placement platform 15 is provided with a placement groove 16 for placing the rotating sleeve 4, the placement groove 16 is an arc groove matching the shape of the side wall of the rotating sleeve 4, ensuring that after the rotating sleeve 4 falls into the placement groove 16, the rotating sleeve 4 fits with the placement groove 16, thereby ensuring the stability of the rotating sleeve 4 when it is located in the placement groove 16; the axial dimension of the placement groove 16 is smaller than the axial dimension of the rotating sleeve 4, reserving a welding working space for the welding robot, and avoiding the sleeve placement platform 15 hindering the welding action; the slideway 2 is located above the sleeve placement platform 15, one end of the slideway 2 is located on one side of the placement groove 16, and the position of the other end of the slideway 2 is higher than the position of one end of the slideway 2 close to the placement groove 16, so that the slideway 2 is tilted, and the rotating sleeve 4 located on the slideway 2 can fall along the slideway 2 under the action of gravitational potential energy.

[0019] There are two side panel placement racks 1, which are respectively located on both sides of the sleeve placement platform 15 and are symmetrically distributed. The top of the side panel placement rack 1 is used to place the S-arm side panel 3; specifically, the top of the side panel placement rack 1 is provided with a accommodating groove that matches the shape of the bottom of the S-arm side panel 3, and the accommodating groove is used to improve the placement stability and position accuracy of the S-arm side panel 3.

[0020] There are two positioning hydraulic systems, which are respectively located on one side of the two side panel placement racks 1 away from the sleeve placement platform 15. The positioning hydraulic system includes two positioning cylinders 5 and a pushing cylinder 6 for pushing the S-arm side panel 3; after the S-arm side panel 3 is placed on the side panel placement rack 1, the telescopic rods of the two positioning cylinders 5 are respectively coaxial with the cylinder shaft hole 31 and the connecting rod shaft hole 33 on the S-arm side panel 3, and the placement groove 16 is coaxial with the rotating hole 32 on the S-arm side panel 3. Specifically, the end of the slide 2 close to the placement groove 16 is provided with a delivery and stop mechanism for controlling the falling / stopping of the rotating sleeve 4 on the slide 2. The delivery and stop mechanism includes a first delivery and stop plate 10, a second delivery and stop plate 9 and a gear 7. A mounting plate 13 is fixed above the slide 2. The gear 7 is rotatably arranged on the mounting plate 13 through a rotating shaft. Specifically, the rotating shaft is rotatably connected with the mounting plate 13, and the gear 7 is coaxial with the rotating shaft and fixedly connected; the first delivery and stop plate 10 is located on the side of the gear 7 close to the sleeve placement platform 15, and the second delivery and stop plate 9 is located on the side of the gear 7 away from the sleeve placement platform 15. The first delivery and stop plates 10 and the second delivery and stop plates 9 are both provided with a rack 8 meshing with the gear 7 on the side close to the gear 7, and one end of the first delivery and stop plates 10 and the second delivery and stop plates 9 are both slidably connected with the mounting plate 13.

[0021] The spacing between the first stop plate 10 and the second stop plate 9 is not less than the diameter of the rotating sleeve 4 and less than 1.5 times the diameter of the rotating sleeve 4. The sizes of the first stop plate 10 and the second stop plate 9 are determined according to the moving stroke to ensure that when the first stop plate 10 or the second stop plate 9 moves up, the other stop plate just moves down to one side of the rotating sleeve 4 on the slide 2, and to ensure that when the bottom of the first stop plate 10 or the second stop plate 9 contacts the slide 2, the bottom of the other stop plate is located above the rotating sleeve 4 on the slide 2, so that the stop mechanism ensures that only one rotating sleeve 4 falls into the placement groove 16 each time; the gear 7 is driven to rotate by the driving mechanism.

[0022] Specifically, the driving mechanism includes a stop cylinder 11 and a connecting rod 12. The stop cylinder 11 is fixedly connected to a mounting plate 13. The output end of the stop cylinder 11 is hinged to one end of the connecting rod 12, and the other end of the connecting rod 12 is connected to a rotating shaft. When the output end of the stop cylinder 11 is extended or retracted, the connecting rod 12 drives the rotating shaft to rotate, and the rotating shaft drives the gear 7 to rotate.

[0023] Specifically, baffles 14 are provided on both sides of the slideway 2, and the baffles 14 prevent the rotating sleeve 4 from escaping from the slideway 2 from one side, and limit the sliding path of the rotating sleeve 4, so as to ensure that the rotating sleeve 4 accurately rolls down into the placement groove 16. More specifically, the spacing between the baffles 14 on both sides of the slideway 2 is slightly larger than the axial dimension of the rotating sleeve 4, that is, it is ensured that the baffles 14 on both sides do not clamp the rotating sleeve 4, and the rotating sleeve 4 can roll down along the slideway 2, and at the same time, it is prevented that the rotating sleeve 4 tilts when rolling down along the slideway 2 due to the excessive spacing between the baffles 14, which affects the accuracy of the rolling position of the rotating sleeve 4.

[0024] When the side plate placement racks 1 on both sides are placed with S-arm side plates 3, the end of the slideway 2 close to the placement groove 16 will be located between the S-arm side plates 3 on both sides. To ensure that the rotating sleeve 4 can roll down along the slideway 2, the width of the slideway 2 must be equal to or greater than the axial dimension of the rotating sleeve 4, and the distance between the two side baffles 14 will be greater than the axial dimension of the rotating sleeve 4, so that the part of the slideway 2 located between the S-arm side plates 3 hinders the movement of the S-arm side plates 3, that is, the S-arm side plates 3 are hindered by the slideway 2 and the baffle 14 and cannot contact the rotating sleeve 4 in the placement groove 16, affecting welding. To solve the above problem, the baffle 14 is set at the part of the slideway 2 that is not located between the S-arm side plates 3, and the width of the part of the slideway 2 located between the S-arm side plates 3 is equal to the axial dimension of the rotating sleeve 4, or consistent with the axial dimension of the placement groove 16. When welding is not performed, the distance between the two S-arm side plates 3 near the placement groove 16 on the side plate placement racks 1 is the same as the distance between the baffle plates 14 on both sides, or is larger than the distance between the baffle plates 14 on both sides and smaller than the distance between the two baffle plates 14 on the back sides. The part of the slide 2 without the baffle plates 14 limits the rotating shaft sleeve 4 through the S-arm side plates 3 on both sides.

[0025] Specifically, the output end of the pushing oil cylinder 6 is connected with a push plate 17, and the push plate 17 corresponds to the position of the S-arm side plate 3. The push plate 17 increases the contact area with the S-arm side plate 3, thereby improving the stability of pushing.

[0026] A method for using a hydraulic loader S-arm welding tool comprises the following steps: S1. Place multiple S-arm side plates 3 on two side plate placement racks 1 respectively, place multiple rotating sleeves 4 on the slide 2 along the length direction, in the initial state, the bottom of the first stop plate 10 is close to the slide 2, the bottom of the second stop plate 9 is far away from the slide 2, and the multiple rotating sleeves 4 on the slide 2 are located on the side of the first stop plate 10 away from the sleeve placement platform 15, and the first stop plate 10 limits the rotating sleeves 4 on the slide 2; S2, start the driving mechanism, the driving mechanism drives the gear 7 to rotate, the gear 7 drives the two stop plates to move through the rack 8, the first stop plate 10 is lifted, a rotating sleeve 4 on the slide 2 close to the sleeve placement platform 15 loses its restriction and rolls into the placement groove 16, at the same time, the second stop plate 9 moves down, and the second stop plate 9 limits the remaining rotating sleeves 4 on the slide 2; S3, start the positioning cylinder 5, the two positioning cylinders 5 on each side respectively extend the telescopic rod to the cylinder shaft hole 31 and the connecting rod shaft hole 33 of the S-arm side plate 3, and then start the pushing cylinder 6, the two pushing cylinders 6 respectively push and press the S-arm side plates 3 on both sides onto the two side surfaces of the rotating sleeve 4; The first stop plate 10 is lifted, the second stop plate 9 is moved down, and after a rotating sleeve 4 on the slideway 2 near the sleeve placement platform 15 rolls down to the placement groove 16, the driving mechanism drives the gear 7 to reverse, and the gear 7 drives the second stop plate 9 to be lifted, and the first stop plate 10 is moved down, so that the next rotating sleeve 4 is located between the first stop plate 10 and the second stop plate 9; S4. Start the welding robot to weld the two S-arm side plates 3 and the rotating shaft sleeve 4 into one body to form the S-arm of the loader.

[0027] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic loader S-arm welding tool, characterized by: The invention comprises a side plate placement frame (1), a sleeve placement frame and a positioning hydraulic system, wherein the sleeve placement frame comprises a sleeve placement platform (15) and a slideway (2) for placing a rotating sleeve (4), wherein the sleeve placement platform (15) is provided with a placement groove (16) for placing the rotating sleeve (4), wherein the placement groove (16) is an arc-shaped groove matching the shape of the side wall of the rotating sleeve (4), wherein the axial dimension of the placement groove (16) is smaller than the axial dimension of the rotating sleeve (4), wherein the slideway (2) is located above the sleeve placement platform (15), wherein one end of the slideway (2) is located on one side of the placement groove (16), and the position of the other end of the slideway (2) is higher than the position of one end of the slideway (2) close to the placement groove (16); There are two side panel placement racks (1), which are respectively located on both sides of the shaft sleeve placement platform (15) and are symmetrically distributed, and the top of the side panel placement rack (1) is used to place the S-arm side panel (3); There are two positioning hydraulic systems, which are respectively located on one side of the two side plate placement frames (1) away from the sleeve placement platform (15), and the positioning hydraulic systems include two positioning cylinders (5) and a pushing cylinder (6) for pushing the S-arm side plate (3); After the S-arm side plate (3) is placed on the side plate placement frame (1), the telescopic rods of the two positioning oil cylinders (5) are respectively coaxial with the oil cylinder shaft hole (31) and the connecting rod shaft hole (33) on the S-arm side plate (3), and the placement groove (16) is coaxial with the rotation hole (32) on the S-arm side plate (3).

2. The hydraulic loader S-arm welding tool according to claim 1, characterized in that: The top of the side panel placement frame (1) is provided with a receiving groove that matches the shape of the bottom of the S-arm side panel (3).

3. The hydraulic loader S-arm welding tool according to claim 1, characterized in that: One end of the slideway (2) close to the placement groove (16) is provided with a delivery and stopping mechanism for controlling the falling / stopping of the rotating shaft sleeve (4) on the slideway (2).

4. The hydraulic loader S-arm welding tool according to claim 3, characterized in that: The delivery and stop mechanism comprises a first delivery and stop plate (10), a second delivery and stop plate (9) and a gear (7); a mounting plate (13) is fixed above the slideway (2); the gear (7) is rotatably arranged on the mounting plate (13) via a rotating shaft; the first delivery and stop plate (10) is located on a side of the gear (7) close to the sleeve placement platform (15); the second delivery and stop plate (9) is located on a side of the gear (7) away from the sleeve placement platform (15); a rack (8) meshing with the gear (7) is provided on a side of the first delivery and stop plate (10) and a side of the second delivery and stop plate (9) close to the gear (7); one end of the first delivery and stop plate (10) and the second delivery and stop plate (9) are slidably connected to the mounting plate (13); a spacing between the first delivery and stop plate (10) and the second delivery and stop plate (9) is not less than a diameter of the rotating sleeve (4) and is less than 1.5 times the diameter of the rotating sleeve (4); the gear (7) is driven to rotate via a driving mechanism.

5. The hydraulic loader S-arm welding tool according to claim 4, characterized in that: The driving mechanism comprises a stop oil cylinder (11) and a linkage rod (12); the stop oil cylinder (11) is fixedly connected to a mounting plate (13); an output end of the stop oil cylinder (11) is hinged to one end of the linkage rod (12); and the other end of the linkage rod (12) is connected to a rotating shaft.

6. The hydraulic loader S-arm welding tool according to claim 1, characterized in that: Baffles (14) are provided on both sides of the slideway (2).

7. The hydraulic loader S-arm welding tool according to claim 1, characterized in that: The output end of the pushing oil cylinder (6) is connected to a push plate (17), and the push plate (17) corresponds to the position of the S-arm side plate (3).

8. A method for using the hydraulic loader S-arm welding tooling according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. A plurality of S-arm side plates (3) are placed on two side plate placement racks (1), and a plurality of rotating sleeves (4) are placed on the slideway (2) along the length direction. In an initial state, the bottom of the first stop plate (10) is close to the slideway (2), and the bottom of the second stop plate (9) is away from the slideway (2). The plurality of rotating sleeves (4) on the slideway (2) are located on a side of the first stop plate (10) away from the sleeve placement platform (15), and the first stop plate (10) limits the rotating sleeves (4) on the slideway (2); S2, start the driving mechanism, the driving mechanism drives the gear (7) to rotate, the gear (7) drives the two stop plates to move through the rack (8), the first stop plate (10) is lifted, a rotating sleeve (4) on the slideway (2) close to the sleeve placement platform (15) loses its restriction and rolls into the placement groove (16), and at the same time, the second stop plate (9) moves downward, and the second stop plate (9) limits the remaining rotating sleeves (4) on the slideway (2); S3, start the positioning cylinder (5), and the two positioning cylinders (5) on each side respectively extend the telescopic rod to the cylinder shaft hole (31) and the connecting rod shaft hole (33) of the S-arm side plate (3), and then start the pushing cylinder (6), and the two pushing cylinders (6) respectively push and press the S-arm side plates (3) on both sides onto the two side surfaces of the rotating sleeve (4); S4. Start the welding robot to weld the two S-arm side plates (3) and the rotating shaft sleeve (4) into one body, thereby forming the S-arm of the loader.

9. The method for using the hydraulic loader S-arm welding tooling according to claim 8, characterized in that: Step S3 comprises: the first stop plate (10) is lifted, the second stop plate (9) is moved downward, and after a rotating sleeve (4) on the slideway (2) close to the sleeve placement platform (15) rolls down to the placement groove (16), the driving mechanism drives the gear (7) to reverse, the gear (7) drives the second stop plate (9) to be lifted, and the first stop plate (10) is moved downward, so that the next rotating sleeve (4) is located between the first stop plate (10) and the second stop plate (9).

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