Automatic bending forming equipment for vehicle door decoration strip

Abstract

The utility model discloses automatic bending forming equipment for a vehicle door trim. The two ends of the mounting frame are each rotationally provided with a rotating plate and a bent telescopic cylinder, and the output end of each bent telescopic cylinder is rotationally connected with the corresponding rotating plate. A sliding plate is slidably mounted on each rotating plate, a transverse pressing air cylinder is fixedly mounted on each rotating plate, and the output end of each transverse pressing air cylinder is fixedly connected with the corresponding sliding plate; a group of vertical driving mechanisms are fixedly mounted on each sliding plate; the middle of the mounting frame and the output ends of the two sets of vertical driving mechanisms are each fixedly provided with a set of clamping mechanism. Two groups of support frames are fixedly mounted on the mounting frame and are respectively positioned at two ends of the clamping mechanism in the middle of the mounting frame; compared with an existing bending forming device, the bending forming device is simple in structure, small in occupied area and high in workpiece bending forming speed, and when the device goes wrong, the device is convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts production and processing, in particular to an automatic bending and forming device for a door trim strip. Background Art

[0002] In the production process of door trims, in order to meet the shape of the door trims, the door trims usually need to be bent and shaped; the existing bending and shaping equipment can generally only perform 2D bending and shaping on the workpiece. Although there are existing equipment that can perform dual-axis and bidirectional 3D bending on the workpiece, the manufacturing cost is relatively high; for this reason, the utility model proposes an automated bending and shaping equipment for door trims. Compared with the existing bending and shaping equipment, it can not only perform dual-axis and bidirectional 3D bending on the workpiece at the same time, but also has a simple structure and a low manufacturing cost. Utility Model Content

[0003] The technical solution used in the utility model is: an automatic bending and forming device for a vehicle door trim strip, comprising: a mounting frame; a rotating plate is rotatably mounted on both ends of the mounting frame, and a bending and telescopic cylinder is rotatably mounted, and the output end of the bending and telescopic cylinder is rotatably connected to the rotating plate;

[0004] Each of the rotating plates is slidably mounted with a sliding plate, and is fixedly mounted with a transverse pressing cylinder, the output end of the transverse pressing cylinder is fixedly connected to the sliding plate; a rotating ring is rotatably mounted on the output end of the transverse pressing cylinder; each of the sliding plates is fixedly mounted with a set of vertical driving mechanisms;

[0005] A group of clamping mechanisms are fixedly installed in the middle of the mounting frame and at the output ends of the two groups of vertical drive mechanisms; a roller is rotatably installed on the clamping mechanisms at the output ends of the two groups of vertical drive mechanisms; a lateral limiting block and a longitudinal limiting block are fixedly installed at both ends of the mounting frame; one end of the lateral limiting block is an arc surface and faces the corresponding rotating ring; one end of the longitudinal limiting block is an inclined surface and faces the corresponding roller;

[0006] Two groups of support frames are fixedly mounted on the mounting frame, and are respectively located at two ends of the clamping mechanism in the middle of the mounting frame.

[0007] Furthermore, a slide is slidably mounted on each rotating plate, and the slide is fixedly connected to the corresponding output end of the transverse clamping cylinder; the sliding plate is fixedly connected to the corresponding slide; and the rotating ring is rotatably mounted on the corresponding slide.

[0008] Furthermore, the vertical driving mechanism includes: a vertical mounting frame; the vertical mounting frame is fixedly mounted on the sliding plate; a vertical push cylinder is fixedly mounted on the vertical mounting frame, and a vertical movable plate is slidably mounted, and the output end of the vertical push cylinder is fixedly connected to the vertical movable plate.

[0009] Furthermore, the clamping mechanism includes: a clamping mechanism mounting frame; the clamping mechanism mounting frame is fixedly mounted on the corresponding mounting frame or the vertical movable plate; a clamping push cylinder and a clamping fixed block are fixedly mounted on the clamping mechanism mounting frame, and a clamping movable plate is slidably mounted; the output end of the clamping push cylinder is fixedly connected to the clamping movable plate; a clamping movable block is fixedly mounted on the clamping movable plate.

[0010] Furthermore, the roller is rotatably mounted on the clamping mechanism mounting frame.

[0011] Furthermore, a No. 1 telescopic cylinder is fixedly mounted on the clamping fixed block in each group of the clamping mechanism, and a pushing frame is fixedly mounted on the output end of the No. 1 telescopic cylinder; and a groove matching the workpiece is provided on the pushing frame.

[0012] Furthermore, a No. 2 telescopic cylinder is fixedly installed on the output end of the No. 1 telescopic cylinder located on the sliding plate, and a vertical clamping frame that cooperates with the pushing frame is fixedly installed on the No. 2 telescopic cylinder; the No. 2 telescopic cylinder is vertically arranged to the No. 1 telescopic cylinder.

[0013] Furthermore, a cutting device is fixedly installed on the clamping movable plate in the clamping mechanism located on the mounting frame; the cutting device includes: a cutting cylinder mounting frame, the cutting cylinder mounting frame is fixedly installed on the clamping movable plate; a cutting cylinder is fixedly installed on the cutting cylinder mounting frame, and a tool rack is slidably installed, and the output end of the cutting cylinder is fixedly connected to the tool rack; a cutting knife is fixedly installed on the tool rack.

[0014] Furthermore, two grooving knives are fixedly mounted on the tool holder, and the two grooving knives are respectively located on both sides of the cutting knife.

[0015] Furthermore, a fixed plate is fixedly installed at both ends of the mounting frame; the two rotating plates are rotatably installed on the corresponding fixed plates; the two lateral limiting blocks and the longitudinal limiting blocks are fixedly installed on the corresponding fixed plates.

[0016] Since the utility model adopts the above technical solution, the utility model has the following beneficial effects: compared with the existing bending and forming equipment, the utility model has a simple structure, occupies a small area, has a fast bending and forming speed for the workpiece, and is convenient for repairing the equipment when problems occur in the equipment; in addition, after the workpiece is bent and formed, the workpiece can be automatically cut from the middle without the need to use other equipment for cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1-Figure 2 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 3 It is a schematic diagram of the position relationship between the vertical driving mechanism and the clamping mechanism of the utility model.

[0019] Figure 4 It is a schematic diagram of the connection relationship between the horizontal pressing cylinder and the vertical driving mechanism of the utility model.

[0020] Figure 5 For this utility model Figure 4 A schematic diagram of the enlarged structure in the middle.

[0021] Figure 6 It is a schematic diagram of the connection relationship between the bending and telescopic cylinder and the rotating plate of the utility model.

[0022] Figure 7 It is a schematic diagram of the specific structure of the clamping mechanism of the utility model.

[0023] Figure 8 It is a schematic diagram of the specific structure of the vertical drive mechanism of the utility model.

[0024] Fig. 9 It is a schematic diagram of the positional relationship among the sliding plate, the rotating ring and the sliding frame of the utility model.

[0025] Fig.10 It is a schematic diagram of the positional relationship between the cutting device and the clamping movable plate of the utility model.

[0026] Fig.11 It is a schematic diagram of the overall structure of the cutting device of the utility model.

[0027] Fig.12 It is a schematic diagram of the positional relationship between the No. 1 telescopic cylinder and the No. 2 telescopic cylinder of the utility model.

[0028] Figure markings: mounting frame 1; rotating plate 2; lateral pressing cylinder 3; bending telescopic cylinder 4; sliding plate 5; rotating ring 6; vertical driving mechanism 7; clamping mechanism 8; roller 9; lateral limiting block 10; longitudinal limiting block 11; supporting frame 12; sliding frame 13; No. 1 telescopic cylinder 14; No. 2 telescopic cylinder 15; cutting device 16; fixing plate 17; vertical mounting frame 71; vertical push cylinder 72; vertical moving plate 73; clamping mechanism mounting frame 81; clamping push cylinder 82; clamping moving plate 83; clamping fixed block 84; clamping moving block 85; pushing frame 141; vertical pressing frame 151; cutting cylinder mounting frame 161; cutting cylinder 162; cutting knife 163; grooving knife 164. DETAILED DESCRIPTION

[0029] Examples, such as Figure 1-12 As shown, an automatic bending and forming equipment for a vehicle door trim strip comprises: a mounting frame 1; a rotating plate 2 is rotatably mounted on both ends of the mounting frame 1, and a bending and telescopic cylinder 4 is rotatably mounted, and the output end of the bending and telescopic cylinder 4 is rotatably connected to the rotating plate 2; the bending and telescopic cylinder 4 is a hydraulic cylinder, and is connected to a hydraulic station in a factory area through a pipeline;

[0030] A sliding plate 5 is slidably mounted on each rotating plate 2, and a transverse pressing cylinder 3 is fixedly mounted thereon, and the output end of the transverse pressing cylinder 3 is fixedly connected to the sliding plate 5; a rotating ring 6 is rotatably mounted on the output end of the transverse pressing cylinder 3; a set of vertical driving mechanisms 7 is fixedly mounted on each sliding plate 5; the transverse pressing cylinder 3 is connected to the air supply device inside the plant area through a pipeline;

[0031] A set of clamping mechanisms 8 are fixedly installed in the middle of the mounting frame 1 and at the output ends of the two sets of vertical driving mechanisms 7; a roller 9 is rotatably installed on the clamping mechanisms 8 at the output ends of the two sets of vertical driving mechanisms 7; a lateral limiting block 10 and a longitudinal limiting block 11 are fixedly installed at both ends of the mounting frame 1; one end of the lateral limiting block 10 is an arc surface and faces the corresponding rotating ring 6; one end of the longitudinal limiting block 11 is an inclined surface and faces the corresponding roller 9;

[0032] Two sets of support frames 12 are fixedly mounted on the mounting frame 1, respectively located at the two ends of the clamping mechanism 8 in the middle of the mounting frame 1; the lateral pressing cylinder 3, the bending telescopic cylinder 4, the vertical driving mechanism 7, and the clamping mechanism 8 are all electrically connected to the control device inside the factory area; when the workpiece is bent and formed, the workpiece is placed on the mounting frame 1 by a mechanical arm or manually, and the workpiece is clamped by three sets of clamping mechanisms 8; the bending angle of the support frame 12 is equal to the bending angle of the workpiece to be finally formed, and fits the shape of the workpiece to be finally formed;

[0033] After the clamping mechanism 8 clamps the workpiece, the transverse pressing cylinder 3, the bending telescopic cylinder 4 and the vertical driving mechanism 7 are started; under the action of the transverse pressing cylinder 3, the rotating ring 6 is always in close contact with the transverse limiting block 10, and under the action of the vertical driving mechanism 7, the roller 9 is always in close contact with the inclined surface of the upper end of the longitudinal limiting block 11; the bending telescopic cylinder 4 drives the rotating plate 2 to rotate toward the rear end, thereby driving the end of the workpiece to rotate backward through the clamping mechanism 8, and bending the workpiece backward; in the process of the bending telescopic cylinder 4 driving the rotating plate 2 to rotate, the vertical The driving mechanism 7 applies a downward force to the clamping mechanism 8, and the clamping mechanism 8 moves downward along the inclined track on the longitudinal limiting block 11 through the roller 9. The transverse pressing cylinder 3 applies an inward force to the clamping mechanism 8, and the clamping mechanism 8 moves along the arc surface of the transverse limiting block 10 under the action of the bending telescopic cylinder 4 through the rotating ring 6. In this way, the bending telescopic cylinder 4 can realize the simultaneous bending of the workpiece end in two directions, backward and downward, through the limiting cooperation of the support frame 12 during the process of bending the workpiece through the clamping mechanism 8.

[0034] After the bending forming is completed, the clamping mechanism 8 is released and no longer clamps the workpiece. The workpiece is then taken out and the bending telescopic cylinder 4 and the vertical driving mechanism 7 are reset.

[0035] Specifically, a slide 13 is slidably mounted on each rotating plate 2 , and the slide 13 is fixedly connected to the output end of the corresponding transverse pressing cylinder 3 ; the sliding plate 5 is fixedly connected to the corresponding slide 13 ; and the rotating ring 6 is rotatably mounted on the corresponding slide 13 .

[0036] Specifically, the vertical driving mechanism 7 includes: a vertical mounting frame 71; the vertical mounting frame 71 is fixedly mounted on the sliding plate 5; a vertical push cylinder 72 is fixedly mounted on the vertical mounting frame 71, and a vertical movable plate 73 is slidably mounted, and the output end of the vertical push cylinder 72 is fixedly connected to the vertical movable plate 73; the clamping mechanisms 8 on both sides are respectively fixedly mounted on the corresponding vertical movable plates 73; the vertical push cylinder 72 is a hydraulic cylinder, which is connected to the hydraulic station inside the factory through a pipeline, and is electrically connected to the control device inside the factory; the vertical push cylinder 72 drives the vertical movable plate 73 to move downward, thereby applying a downward force to the end of the workpiece through the clamping mechanism 8.

[0037] Specifically, the clamping mechanism 8 includes: a clamping mechanism mounting frame 81; the clamping mechanism mounting frame 81 is fixedly mounted on the corresponding mounting frame 1 or the vertical movable plate 73; a clamping push cylinder 82 and a clamping fixed block 84 are fixedly mounted on the clamping mechanism mounting frame 81, and a clamping movable plate 83 is slidably mounted; the output end of the clamping push cylinder 82 is fixedly connected to the clamping movable plate 83; a clamping movable block 85 is fixedly mounted on the clamping movable plate 83; the clamping push cylinder 82 is a hydraulic cylinder, which is connected to the hydraulic station in the factory through a pipeline, and is electrically connected to the control device inside the factory; the clamping movable block 85 is driven by the clamping push cylinder 82 to move close to or away from the clamping fixed block 84, thereby achieving clamping and fixing of the workpiece.

[0038] Specifically, the roller 9 is rotatably mounted on the clamping mechanism mounting frame 81 .

[0039] Specifically, in order to achieve a better bending effect, a No. 1 telescopic cylinder 14 is fixedly installed on the clamping and fixing block 84 in each group of clamping mechanisms 8, and a pushing frame 141 is fixedly installed on the output end of the No. 1 telescopic cylinder 14; the pushing frame 141 is provided with a groove adapted to the workpiece; when placing the workpiece, the workpiece is first placed inside the pushing frame 141, and then the No. 1 telescopic cylinders 14 at both ends are started, and the workpiece is driven to bend a certain angle through the pushing frame 141, and then each No. 1 telescopic cylinder 14 drives the corresponding pushing frame 141 to move, push the workpiece into the clamping mechanism 8, and make the workpiece fit the clamping and fixing block 84; the workpiece is in a straight state before bending, and in order to better bend the workpiece and make the bending curve of the workpiece smoother to achieve a better forming effect, the clamping end face of the clamping and fixing block 84 has a certain angle, which is not parallel to the straight workpiece in the initial state, so the workpiece is initially bent a small amount by the No. 1 telescopic cylinder 14 and the pushing frame 141, so that the workpiece can fit the clamping and fixing block 84;

[0040] Specifically, in order to make the workpiece more stable during the initial small-scale bending of the workpiece by the No. 1 telescopic cylinder 14, the output end of the No. 1 telescopic cylinder 14 (that is, the No. 1 telescopic cylinder 14 located at both ends) located on the sliding plate 5 is fixedly installed with the No. 2 telescopic cylinder 15, and the No. 2 telescopic cylinder 15 is fixedly installed with a vertical clamping frame 151 that cooperates with the pushing frame 141; the No. 2 telescopic cylinder 15 is vertically arranged with the No. 1 telescopic cylinder 14; the No. 1 telescopic cylinder 14 and the No. 2 telescopic cylinder 15 are both cylinders, which are connected to the air supply device inside the factory through pipelines, and are electrically connected to the control device inside the factory; after the workpiece is placed inside the pushing frame 141, the No. 2 telescopic cylinder 15 drives the vertical clamping frame 151 to move downward, and through the cooperation with the pushing frame 141, the two ends of the workpiece are restricted to prevent the workpiece from being ejected from the pushing frame 141 during the initial small-scale bending of the workpiece by the No. 1 telescopic cylinder 14.

[0041] Specifically, a cutting device 16 is fixedly mounted on the clamping movable plate 83 in the clamping mechanism 8 on the mounting frame 1; the cutting device 16 comprises: a cutting cylinder mounting frame 161, which is fixedly mounted on the clamping movable plate 83; a cutting cylinder 162 is fixedly mounted on the cutting cylinder mounting frame 161, and a tool holder is slidably mounted, and the output end of the cutting cylinder 162 is fixedly connected to the tool holder; a cutting knife 163 is fixedly mounted on the tool holder; the cutting cylinder 162 is a hydraulic cylinder, which is connected to the hydraulic station inside the factory through a pipeline, and is electrically connected to the control device inside the factory; after the workpiece is bent and formed, the cutting cylinder 162 is started to drive the cutting knife 163 to move toward the workpiece, thereby cutting the workpiece, cutting the workpiece from the middle, so that the workpiece is divided into two;

[0042] Two grooving knives 164 are also fixedly installed on the tool holder, and the two grooving knives 164 are respectively located on both sides of the cutting knife 163; when the cutting cylinder 162 drives the cutting knife 163 to cut the workpiece, the grooving knife 164 moves simultaneously to perform grooving processing on both ends of the cutting position of the workpiece.

[0043] Specifically, a fixed plate 17 is fixedly installed at both ends of the mounting frame 1; the two rotating plates 2 are rotatably installed on the corresponding fixed plates 17; the two lateral limiting blocks 10 and the longitudinal limiting block 11 are fixedly installed on the corresponding fixed plates 17.

[0044] Working principle: When the workpiece is bent, the workpiece is placed on the three push racks 141 on the mounting frame 1, and the three push racks 141 support the workpiece. Then, the No. 2 telescopic cylinders 15 at both ends are started, driving the vertical clamping frames 151 to move downward, and the two ends of the workpiece are clamped and fixed in cooperation with the push racks 141. The No. 1 telescopic cylinders 14 at both ends are simultaneously moved backwards for a certain distance to perform the initial bending on the workpiece, until the two ends of the workpiece are in contact with the corresponding end faces of the clamping and fixing blocks 84, and then the clamping push cylinder 82 is started, driving the clamping moving block 85 to move, and the workpiece is clamped and fixed;

[0045] Start the bending telescopic cylinder 4, the transverse pressing cylinder 3 and the vertical pushing cylinder 72. The bending telescopic cylinder 4 drives the rotating plate 2 to rotate inward. During the rotation, the workpiece is bent inward and downward at the same time through the cooperation between the rotating ring 6 and the transverse limiting block 10 and the cooperation between the roller 9 and the longitudinal limiting block 11. The bending of the workpiece is completed under the limiting support of the support frame 12. During actual use, the transverse pressing cylinder 3 always maintains a certain pressure. During the movement of the rotating ring 6 along the transverse limiting block 10, since the bending telescopic rod 4 is a hydraulic cylinder, its push-pull force is much greater than that of the cylinder, and due to the compressibility of the gas, the output end of the transverse pressing cylinder 3 will retract a certain length, and the close contact between the rotating ring 6 and the transverse limiting block 10 is maintained through the principle of gas compressibility.

[0046] After the bending is completed, the cutting cylinder 162 is started to drive the cutting knife 163 and the grooving knife 164 to cut and groove the workpiece; after the cutting is completed, the two No. 2 telescopic cylinders 15 drive the vertical clamping frame 151 to move upward, and then the three No. 1 telescopic cylinders 14 are started at the same time, and the workpiece is pushed out through the three pushing frames 141 to complete the bending, forming and cutting of the workpiece.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic bending and forming equipment for door trim strips, characterized in that: include: A mounting frame (1); a rotating plate (2) is rotatably mounted on each of the two ends of the mounting frame (1), and a bending and telescopic cylinder (4) is rotatably mounted thereon; an output end of the bending and telescopic cylinder (4) is rotatably connected to the rotating plate (2); A sliding plate (5) is slidably mounted on each rotating plate (2), and a transverse pressing cylinder (3) is fixedly mounted thereon, the output end of the transverse pressing cylinder (3) being fixedly connected to the sliding plate (5); a rotating ring (6) is rotatably mounted on the output end of the transverse pressing cylinder (3); and a set of vertical driving mechanisms (7) is fixedly mounted on each sliding plate (5); A group of clamping mechanisms (8) are fixedly mounted on the middle part of the mounting frame (1) and the output ends of the two groups of vertical drive mechanisms (7); a roller (9) is rotatably mounted on the clamping mechanisms (8) at the output ends of the two groups of vertical drive mechanisms (7); a transverse limiting block (10) and a longitudinal limiting block (11) are fixedly mounted on both ends of the mounting frame (1); one end of the transverse limiting block (10) is an arc surface and faces the corresponding rotating ring (6); one end of the longitudinal limiting block (11) is an inclined surface and faces the corresponding roller (9); Two groups of support frames (12) are fixedly mounted on the mounting frame (1), respectively located at two ends of a clamping mechanism (8) in the middle of the mounting frame (1).

2. The door trim strip bending automation equipment according to claim 1, characterized in that: A slide (13) is slidably mounted on each rotating plate (2), and the slide (13) is fixedly connected to the output end of the corresponding transverse pressing cylinder (3); the sliding plate (5) is fixedly connected to the corresponding slide (13); and the rotating ring (6) is rotatably mounted on the corresponding slide (13).

3. The door trim strip bending automation equipment according to claim 1, characterized in that: The vertical drive mechanism (7) comprises: a vertical mounting frame (71); the vertical mounting frame (71) is fixedly mounted on the sliding plate (5); a vertical push cylinder (72) is fixedly mounted on the vertical mounting frame (71), and a vertical movable plate (73) is slidably mounted thereon, and an output end of the vertical push cylinder (72) is fixedly connected to the vertical movable plate (73).

4. The door trim strip bending automation equipment according to claim 3, characterized in that: The clamping mechanism (8) comprises: a clamping mechanism mounting frame (81); the clamping mechanism mounting frame (81) is fixedly mounted on the corresponding mounting frame (1) or the vertical movable plate (73); a clamping push cylinder (82) and a clamping fixed block (84) are fixedly mounted on the clamping mechanism mounting frame (81), and a clamping movable plate (83) is slidably mounted; the output end of the clamping push cylinder (82) is fixedly connected to the clamping movable plate (83); and a clamping movable block (85) is fixedly mounted on the clamping movable plate (83).

5. The door trim strip bending automation equipment according to claim 4, characterized in that: The roller (9) is rotatably mounted on the clamping mechanism mounting frame (81).

6. The door trim strip bending automation equipment according to claim 4, characterized in that: A No. 1 telescopic cylinder (14) is fixedly mounted on the clamping fixed block (84) in each group of the clamping mechanisms (8), and a pushing frame (141) is fixedly mounted on the output end of the No. 1 telescopic cylinder (14); the pushing frame (141) is provided with a groove adapted to fit the workpiece.

7. The door trim strip bending automation equipment according to claim 6, characterized in that: A No. 2 telescopic cylinder (15) is fixedly mounted on the output end of the No. 1 telescopic cylinder (14) located on the sliding plate (5), and a vertical pressing frame (151) that cooperates with the pushing frame (141) is fixedly mounted on the No. 2 telescopic cylinder (15); the No. 2 telescopic cylinder (15) is vertically arranged with respect to the No. 1 telescopic cylinder (14).

8. The door trim strip bending automation equipment according to claim 4, characterized in that: A cutting device (16) is fixedly mounted on a clamping movable plate (83) in the clamping mechanism (8) located on the mounting frame (1); the cutting device (16) comprises: a cutting cylinder mounting frame (161), the cutting cylinder mounting frame (161) being fixedly mounted on the clamping movable plate (83); a cutting cylinder (162) being fixedly mounted on the cutting cylinder mounting frame (161), and a tool holder being slidably mounted on the cutting cylinder mounting frame (161), the output end of the cutting cylinder (162) being fixedly connected to the tool holder; and a cutting knife (163) being fixedly mounted on the tool holder.

9. The door trim strip bending automation equipment according to claim 8, characterized in that: Two grooving knives (164) are also fixedly mounted on the tool holder, and the two grooving knives (164) are respectively located on both sides of the cutting knife (163).

10. The door trim strip bending automation equipment according to claim 1, characterized in that: A fixed plate (17) is fixedly mounted on each of the two ends of the mounting frame (1); the two rotating plates (2) are rotatably mounted on the corresponding fixed plates (17); and the two transverse limiting blocks (10) and the longitudinal limiting block (11) are fixedly mounted on the corresponding fixed plates (17).

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