A clamping and positioning mechanism for profile laser cutting equipment

Abstract

The present invention discloses a clamping and positioning mechanism for profile laser cutting equipment, which belongs to the field of cutting processing technology. It comprises: a pair of longitudinal clamping assemblies symmetrically installed on a turntable; the longitudinal clamping assembly comprises a longitudinal clamping block radially slidably installed; a pair of transverse clamping assemblies symmetrically installed on the turntable; the transverse clamping assembly comprises a transverse clamping block radially slidably installed, and the transverse clamping block is connected with a tension spring for pulling the transverse clamping block away from the center of the turntable; each longitudinal clamping assembly is connected with a push-pull assembly; the push-pull assembly drives the longitudinal clamping block and the transverse clamping block through the push-pull block, the driving pin and the connecting rod. When the driver pushes the push-pull block inward, the longitudinal clamping block and the transverse clamping block can be controlled to be clamped on the profile to achieve four-sided positioning of the profile, which is suitable for square profiles or long profiles; when the driver pulls the push-pull block outward, the transverse clamping block can be controlled to be clamped on the profile to achieve two-sided positioning of the profile, which is suitable for "U" profiles or "H" profiles.

Description

Technical Field

[0001] The invention relates to the technical field of cutting processing, and in particular to a clamping and positioning mechanism for profile laser cutting equipment. Background Art

[0002] In metal processing, building materials manufacturing and automated production lines, the accuracy and efficiency of profile cutting are crucial. However, traditional profile cutting equipment has significant limitations in clamping and positioning. These devices usually use a four-claw drive mechanism, which was originally designed to achieve positioning by clamping the four sides of the profile with four claws at the same time. However, faced with a variety of profile shapes (such as square, rectangular, U-shaped, H-shaped, etc.) and size changes, the four-claw drive mechanism seems to be unable to cope with it. When profiles of different shapes or sizes need to be replaced, it is often necessary to manually replace or adjust the clamping end, which is not only time-consuming and labor-intensive, but also greatly reduces cutting efficiency and increases production costs. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the present invention provides a clamping and positioning mechanism for profile laser cutting equipment, which has four-side positioning and face-to-face positioning clamping modes.

[0004] The present invention adopts the following technical solution: a clamping and positioning mechanism for profile laser cutting equipment, comprising:

[0005] A turntable, with a through hole in the center for the profile to pass through;

[0006] A pair of longitudinal clamping assemblies are symmetrically mounted on the front side of the turntable along the through hole; the longitudinal clamping assemblies include longitudinal clamping blocks radially slidably mounted on the front side of the turntable;

[0007] A pair of transverse clamping assemblies are symmetrically mounted on the front side of the turntable along the through hole; the transverse clamping assemblies include a transverse clamping block radially slidably mounted on the front side of the turntable, and the transverse clamping block is connected to a tension spring for pulling the transverse clamping block away from the through hole;

[0008] Each of the longitudinal clamping assemblies is connected to a push-pull assembly;

[0009] The push-pull assembly comprises:

[0010] A push-pull block is slidably mounted on the longitudinal clamping block, and the sliding direction of the push-pull block is parallel to that of the longitudinal clamping block;

[0011] A driver, fixed on the turntable, used for driving the push-pull block to move;

[0012] Two driving pins are cooperatively mounted on both sides of the push-pull block to drive the longitudinal clamping block to move;

[0013] Two connecting rods are arranged on both sides of the push-pull block and are correspondingly hinged to the driving pin on the same side; one end of the connecting rod away from the driving pin is hinged to the transverse clamping block on the same side.

[0014] The further feature is that the rear side of the turntable is rotatably mounted on a slewing support, and flanges for connecting to a frame are fixed on both sides of the slewing support.

[0015] A guide longitudinal wheel is arranged at one end of the longitudinal clamping block close to the through hole, and first U-shaped seats are respectively installed at both ends of the guide longitudinal wheel, and the first U-shaped seats are fixed on both sides of the end of the longitudinal clamping block.

[0016] The two sides of the longitudinal clamping block are respectively slidably connected to the longitudinal sliding bar, and the longitudinal sliding bar is fixed on the front side of the rotating disk.

[0017] An avoidance groove is formed at one end of the push-pull block and the longitudinal clamping block away from the through hole, the length direction of the avoidance groove is parallel to the sliding direction of the longitudinal clamping block, and the driver is opposite to the avoidance groove in the radial direction of the rotating disk.

[0018] The push-pull block is respectively provided with a stepped slide groove penetrating the push-pull block, and the length direction of the stepped slide groove is parallel to the sliding direction of the longitudinal clamping block; at least two guide pins are passed through the stepped slide groove; the inner end of the guide pin shaft is fixed on the longitudinal clamping block, and a roller is rotatably installed on the outer end of the guide pin shaft; the roller is pressed on the step in the stepped slide groove, and the circumferential surface of the roller is in rolling contact with the side wall of one side of the stepped slide groove.

[0019] The longitudinal clamping block is provided with a first through slot, which is perpendicular to the sliding direction of the longitudinal clamping block; the push-pull block is provided with a second through slot opposite to the first through slot, and the two sides of the second through slot have symmetrical inclined surfaces; a sliding sleeve is mounted on the middle part of the driving pin, and a slider is fixed to the end of the driving pin away from the connecting rod; wherein, the driving pin is inserted into the first through slot and the second through slot, the sliding sleeve is in rolling contact with the inclined surfaces on the corresponding sides of the second through slot, and the slider is slidably installed in the first through slot.

[0020] The transverse clamping assembly and the longitudinal clamping assembly are arranged at an angle of 90 degrees. A guide wheel is arranged at one end of the transverse clamping block close to the through hole. Second U-shaped seats are respectively installed at both ends of the guide wheel. The second U-shaped seats are fixed on both sides of the end of the transverse clamping block.

[0021] The two sides of the transverse clamping block are respectively slidably connected to the transverse sliding bar, and the transverse sliding bar is fixed on the front side of the turntable; a fixing rod is fixed on the transverse clamping block, and one end of the connecting rod away from the driving pin is hinged on the fixing rod of the transverse clamping block on the same side.

[0022] A baffle is fixed to one end of the two transverse sliding bars away from the transverse clamping block; a spring mounting hole penetrating the transverse clamping block is opened on the transverse clamping block, and the spring mounting hole is parallel to the moving direction of the transverse clamping block; a sealing plate is fixed to one end of the transverse clamping block away from the baffle; the tension spring is passed through the spring mounting hole, and the two ends of the tension spring are respectively fixedly connected to the baffle and the sealing plate.

[0023] The beneficial effects of the present invention are:

[0024] When the driver pushes the push-pull block inward, the push-pull block and the connecting rod structure on both sides are used to realize the movement control of the two longitudinal clamping blocks and the two transverse clamping blocks, which makes the control more convenient; the design of the double through slots, the driving pin and the connecting rod makes it possible for the longitudinal clamping block to contact the profile during the closing movement. As the driver continues to push, the transverse clamping block will continue to move until it fits the profile. Therefore, when the profile switches between square profiles and long profiles, there is no need to adjust the clamping positioning mechanism;

[0025] When the driver pulls the push-pull block outward, it can control the two longitudinal clamping blocks and the two transverse clamping blocks to open, thereby loosening the profile; however, when the driver continues to pull the push-pull block outward, the push-pull block will pull the transverse clamping blocks inward through the driving pin and the connecting rod, so that the two transverse clamping blocks can be clamped on the two opposite sides of the profile to position the profile to be cut; this can be applied to profiles that can only be positioned on both sides, such as "U" profiles or "H" profiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a three-dimensional diagram of a clamping and positioning mechanism for a profile laser cutting device according to the present invention.

[0028] Figure 2 This is a front view of a clamping and positioning mechanism for profile laser cutting equipment of the present invention.

[0029] Figure 3 It is a stereoscopic view of the longitudinal clamping assembly and the push-pull assembly in the present invention.

[0030] Figure 4 It is a front view of the longitudinal clamping assembly and the push-pull assembly in the present invention.

[0031] Figure 5 It is a stereoscopic view of the transverse clamping assembly of the present invention from a first viewing angle.

[0032] Figure 6 It is a stereoscopic view of the transverse clamping assembly of the present invention from a second viewing angle.

[0033] Figure 7 It is the front view of the present invention in the initial state.

[0034] Figure 8 It is a front view of the present invention in the second clamping and positioning state.

[0035] Description of reference numerals:

[0036] 1. Turntable; 11. Through hole;

[0037] 2. Longitudinal clamping assembly; 21. Longitudinal clamping block; 211. First through slot; 22. Guide longitudinal wheel; 23. First U-shaped seat; 24. Longitudinal slide bar;

[0038] 3. Horizontal clamping assembly; 31. Horizontal clamping block; 311. Spring mounting hole; 32. Guide horizontal wheel; 33. Tension spring; 34. Second U-shaped seat; 35. Horizontal slide bar; 36. Fixed rod; 37. Stop bar; 38. Closing plate;

[0039] 4. Push-pull assembly; 41. Push-pull block; 411. Step slide; 412. Second through slot; 413. Inclined surface; 42. Driver; 43. Driving pin; 44. Connecting rod; 45. Guide pin shaft; 46. Roller; 47. Sliding sleeve; 48. Sliding block;

[0040] 5. Slewing bearing; 51. Flange;

[0041] 6. Profile. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Embodiment 1:

[0044] Combination Figure 1 and Figure 2As shown, the present invention provides a clamping and positioning mechanism for profile laser cutting equipment. A through hole 11 is provided in the center of the turntable 1 for the profile 6 to pass through. The turntable 1 is swivel mounted on the front side of the slewing bearing 5. Flanges 51 are fixed on both sides of the slewing bearing 5. The flanges 51 are fixed to the frame of the cutting equipment by bolts. Four longitudinal clamping assemblies 2 and transverse clamping assemblies 3 arranged at 90 degrees are installed on the front side of the turntable 1. The four longitudinal clamping assemblies 2 and transverse clamping assemblies 3 are closed by the push-pull assembly 4 to achieve clamping and positioning of the profile 6.

[0045] Combination Figures 1 to 4 As shown, two longitudinal clamping assemblies 2 are symmetrically installed on the front side of the turntable 1. The longitudinal clamping assembly 2 includes a pair of longitudinal slide bars 24 radially parallel to the turntable 1. The two sides of the longitudinal clamping block 21 are respectively slidably connected to the longitudinal slide bars 24. A dovetail groove type sliding matching structure is adopted between the longitudinal clamping block 21 and the longitudinal slide bar 24 to prevent the longitudinal clamping block 21 from being separated from the longitudinal slide bar 24. The axial extension line of the longitudinal slide bar 24 passes through the center of the turntable 1. A guide longitudinal wheel 22 is installed at the inner end of the longitudinal clamping block 21. When the longitudinal clamping block 21 moves inward, the guide longitudinal wheel 22 abuts against the side of the profile 6. An avoidance groove is provided at the outer end of the longitudinal clamping block 21 for installing the driver 42 in the push-pull assembly 4. A first through groove 211 perpendicular to the sliding direction of the longitudinal clamping block 21 is provided in the middle of the longitudinal clamping block 21. The first through groove 211 is used to cooperate with the push-pull assembly 4.

[0046] Combination Figures 1 to 6 As shown, two transverse clamping assemblies 3 are symmetrically installed on the front side of the turntable 1. The transverse clamping assembly 3 includes a pair of transverse slide bars 35 radially parallel to the turntable 1, and the two sides of the transverse clamping block 31 are respectively slidably connected to the transverse slide bars 35, and the axial extension line of the transverse clamping block 31 passes through the center of the turntable 1. The transverse clamping block 31 is perpendicular to the longitudinal clamping block 21 and staggered 90° around the center of the turntable 1. A guide transverse wheel 32 is installed at the inner end of the transverse clamping block 31. When the transverse clamping block 31 moves inward, the guide transverse wheel 32 abuts against the side of the profile 6. The transverse clamping block 31 is connected to a tension spring 33, which gives the transverse clamping block 31 a pulling force to slide toward the side away from the center of the turntable 1, which is used to cooperate with the push-pull assembly 4.

[0047] Combination Figures 1 to 4 As shown, the push-pull assembly 4 is used to drive the longitudinal clamping block 21 and the transverse clamping block 31 to move. The push-pull assembly 4 includes a push-pull block 41 slidably mounted on the longitudinal clamping block 21, and the push-pull block 41 is parallel to the sliding direction of the longitudinal clamping block 21. The outer end of the push-pull block 41 is also provided with an avoidance groove, and the driver 42 is fixed on the turntable 1 at a position opposite to the avoidance groove to shorten the length of the overall structure. The driver 42 can be a cylinder or a hydraulic cylinder, and the output end of the driver 42 is fixedly connected to the push-pull block 41 to drive the push-pull block 41 to move back and forth.

[0048] A step slot 411 is provided on both sides of the push-pull block 41. The step slot 411 passes through the push-pull block 41, and the length direction of the step slot 411 is parallel to the sliding direction of the longitudinal clamping block 21. Two guide pins 45 are inserted into the step slot 411, and the inner ends of the guide pins 45 are fixed to the longitudinal clamping block 21 through threaded connection. The roller 46 is rotatably mounted on the outer end of the guide pin 45, and the roller 46 is pressed on the step in the step slot 411, and the circumferential surface of the roller 46 is in rolling contact with the side wall of one side of the step slot 411. The rollers 46 on both sides are arranged in opposite directions and press against the step slot 411 in different directions, so as to ensure that the push-pull block 41 can move in a straight line; the roller 46 is pressed on the step in the step slot 411 to ensure that the push-pull block 41 and the longitudinal clamping block 21 are basically fitted to prevent the two from separating.

[0049] like Figure 3 and Figure 4 As shown, the driving pin 43 and the connecting rod 44 are key components for driving the longitudinal clamping block 21 and the transverse clamping block 31. The push-pull block 41 is provided with a second through slot 412 opposite to the first through slot 211 of the longitudinal clamping block 21, and the two sides of the second through slot 412 have symmetrical inclined surfaces 413. Two driving pins 43 are symmetrically arranged in the first through slot 211 and the second through slot 412, and the outer ends of the driving pins 43 are hinged to the connecting rod 44 on the corresponding side, and the inner ends of the driving pins 43 are fixed with a slider 48, and the slider 48 is slidably installed in the first through slot 211. A sliding sleeve 47 is sleeved in the middle of the driving pin 43, and the sliding sleeve 47 is in rolling contact with the inclined surface 413 on the corresponding side of the second through slot 412. A fixing rod 36 is fixed on the transverse clamping block 31, and the fixing rod 36 is hinged to the other end of the connecting rod 44. Under the action of the tension spring 33, the tension spring 33 pulls the transverse clamping block 31 and one end of the connecting rod 44 to move outward, thereby keeping the driving pin 43 at the other end of the connecting rod 44 in a close contact state with the inclined surface 413 in the second through groove 412.

[0050] When working, combine Figure 1 , Figure 2 and Figure 7 , Figure 8 As shown, Figure 2 Take the push-pull assembly 4 on the upper middle side as an example:

[0051] In the initial state, if Figure 2 As shown, the guide longitudinal wheel 22 at the end of the longitudinal clamping block 21 and the guide transverse wheel 32 at the end of the transverse clamping block 31 are both at a certain distance from the profile 6;

[0052] When the driver 42 pushes the push-pull block 41 downward, the inclined surface 413 at the lower part of the push-pull block 41 pushes the driving pin 43, so that the driving pin 43 moves downward and inward, and the driving pin 43 pushes the longitudinal clamping block 21 downward until the guide longitudinal wheel 22 at the lower end of the longitudinal clamping block 21 abuts against the profile 6;

[0053] When the guide longitudinal wheel 22 at the lower end of the longitudinal clamping block 21 abuts against the profile 6, as the driver 42 continues to push the push-pull block 41 downward, the inclined surface 413 at the lower part of the push-pull block 41 will push the driving pin 43 to move inward, and then pull the transverse clamping block 31 through the connecting rod 44, so that the transverse clamping block 31 overcomes the tension of the tension spring 33 and moves toward the profile 6 until the guide transverse wheel 32 at the end of the transverse clamping block 31 abuts against the profile 6, thereby achieving the clamping and positioning of the four sides of the profile 6, which is convenient for cutting the profile 6 to a fixed length, such as Figure 7 As shown; this clamping method can be applied to both square profiles and long profiles;

[0054] When the driver 42 pulls the push-pull block 41 upward, in contrast to the above process, the transverse clamping block 31 and the longitudinal clamping block 21 will gradually release the profile 6 and return to the initial state.

[0055] In the initial state, when the driver 42 pulls the push-pull block 41 upward, the push-pull block 41 will drive the driving pin 43 to move upward. At this time, the driving pin 43 can also pull the transverse clamping block 31 through the connecting rod 44, so that the transverse clamping block 31 overcomes the tension of the tension spring 33 and moves toward the profile 6 until the guide horizontal wheel 32 at the end of the transverse clamping block 31 abuts against the profile 6, so that the profile 6 is clamped and positioned relative to the two sides. Figure 8 As shown, this can be applied to profiles which can only be positioned on two sides, such as "U" profiles or "H" profiles.

[0056] Embodiment 2:

[0057] Based on the above embodiment 1, Figures 3 to 6 As shown, two guide longitudinal wheels 22 are provided, and the ends of the two guide longitudinal wheels 22 are rotatably mounted on the first U-shaped seat 23. Two raised support plates are provided at the ends of the longitudinal clamping block 21, and the first U-shaped seat 23 is fitted on the support plates and fixed to the support plates by bolts. This structure facilitates the quick replacement of the guide longitudinal wheels 22. Similarly, the two ends of the two guide transverse wheels 32 are rotatably mounted on the second U-shaped seat 34, and the second U-shaped seat 34 is connected with the support plates at the ends of the transverse clamping block 31.

[0058] Embodiment three:

[0059] Based on the above embodiment 1, Figure 5 , Figure 6As shown, a stopper 37 is fixed to one end of the two transverse slide bars 35 away from the transverse clamp block 31. The stopper 37 can limit the transverse clamp block 31 to prevent the transverse clamp block 31 from sliding out of the transverse slide bar 35. A pair of spring mounting holes 311 penetrating the transverse clamp block 31 are provided on the transverse clamp block 31. The spring mounting holes 311 are parallel to the moving direction of the transverse clamp block 31. A tension spring 33 is inserted in each spring mounting hole 311. A sealing plate 38 is fixed to the inner end of the transverse clamp block 31 to seal the end of the spring mounting hole 311. The two ends of the tension spring 33 are fixedly connected to the stopper 37 and the sealing plate 38 respectively. By inserting the tension spring 33 in the transverse clamp block 31, the overall length of the transverse clamp assembly 3 can be shortened.

[0060] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A clamping and positioning mechanism for profile laser cutting equipment, characterized in that: include: A turntable (1) having a through hole (11) at the center for the profile (6) to pass through; A pair of longitudinal clamping assemblies (2) are symmetrically mounted on the front side of the turntable (1) along the through hole (11); the longitudinal clamping assemblies (2) include longitudinal clamping blocks (21) radially slidably mounted on the front side of the turntable (1); A pair of transverse clamping assemblies (3) are symmetrically mounted on the front side of the turntable (1) along the through hole (11); the transverse clamping assemblies (3) include a transverse clamping block (31) radially slidably mounted on the front side of the turntable (1), and the transverse clamping block (31) is connected to a tension spring (33) for pulling the transverse clamping block (31) away from the through hole (11); Each of the longitudinal clamping components (2) is connected to a push-pull component (4); The push-pull assembly (4) comprises: A push-pull block (41) is slidably mounted on the longitudinal clamping block (21), wherein the sliding directions of the push-pull block (41) and the longitudinal clamping block (21) are parallel; A driver (42) fixed on the turntable (1) and used for driving the push-pull block (41) to move; Two driving pins (43) are cooperatively mounted on both sides of the push-pull block (41) and are used to drive the longitudinal clamping block (21) to move; Two connecting rods (44) are disposed on both sides of the push-pull block (41) and are correspondingly hinged to the driving pin (43) on the same side; The push-pull block (41) is provided with a stepped slot (411) penetrating the push-pull block (41) on both sides, and the length direction of the stepped slot (411) is parallel to the sliding direction of the longitudinal clamping block (21); at least two guide pins (45) are passed through the stepped slot (411); the inner end of the guide pin (45) is fixed on the longitudinal clamping block (21), and the outer end of the guide pin (45) is rotatably mounted with a roller (46); the roller (46) is pressed on the step in the stepped slot (411), and the circumferential surface of the roller (46) is in rolling contact with the side wall of one side of the stepped slot (411); The longitudinal clamping block (21) is provided with a first through slot (211), and the first through slot (211) is perpendicular to the sliding direction of the longitudinal clamping block (21); The push-pull block (41) is provided with a second through slot (412) opposite to the first through slot (211), and two sides of the second through slot (412) are provided with symmetrical inclined surfaces (413); A sliding sleeve (47) is sleeved on the middle of the driving pin (43), and a sliding block (48) is fixed to one end of the driving pin (43) away from the connecting rod (44); The driving pin (43) is inserted into the first through slot (211) and the second through slot (412), the sliding sleeve (47) is in rolling contact with the inclined surface (413) on the corresponding side of the second through slot (412), and the sliding block (48) is slidably installed in the first through slot (211); The two sides of the transverse clamping block (31) are respectively slidably connected to the transverse sliding bar (35), and the transverse sliding bar (35) is fixed to the front side of the turntable (1); a fixing rod (36) is fixed to the transverse clamping block (31), and one end of the connecting rod (44) away from the driving pin (43) is hinged to the fixing rod (36) of the transverse clamping block (31) on the same side; A stop bar (37) is fixed to one end of the two transverse sliding bars (35) away from the transverse clamping block (31); a spring mounting hole (311) penetrating the transverse clamping block (31) is provided on the transverse clamping block (31), and the spring mounting hole (311) is parallel to the moving direction of the transverse clamping block (31); a sealing plate (38) is fixed to one end of the transverse clamping block (31) away from the stop bar (37); the tension spring (33) is inserted into the spring mounting hole (311), and the two ends of the tension spring (33) are respectively fixedly connected to the stop bar (37) and the sealing plate (38).

2. The clamping and positioning mechanism for profile laser cutting equipment according to claim 1, characterized in that: The rear side of the turntable (1) is rotatably mounted on a slewing bearing (5), and flanges (51) for connecting to a frame are fixed on both sides of the slewing bearing (5).

3. The clamping and positioning mechanism for profile laser cutting equipment according to claim 1, characterized in that: A guide longitudinal wheel (22) is provided at one end of the longitudinal clamping block (21) close to the through hole (11), and first U-shaped seats (23) are respectively installed at both ends of the guide longitudinal wheel (22). The first U-shaped seats (23) are fixed on both sides of the end of the longitudinal clamping block (21).

4. The clamping and positioning mechanism for profile laser cutting equipment according to claim 1, characterized in that: The two sides of the longitudinal clamping block (21) are respectively slidably connected to the longitudinal sliding bar (24), and the longitudinal sliding bar (24) is fixed on the front side of the rotating disk (1).

5. The clamping and positioning mechanism for profile laser cutting equipment according to claim 1, characterized in that: An escape groove is formed at one end of the push-pull block (41) and the longitudinal clamping block (21) away from the through hole (11), the length direction of the escape groove is parallel to the sliding direction of the longitudinal clamping block (21), and the driver (42) is opposite to the escape groove in the radial direction of the rotating disk (1).

6. The clamping and positioning mechanism for profile laser cutting equipment according to claim 1, characterized in that: The transverse clamping assembly (3) and the longitudinal clamping assembly (2) are arranged at an angle of 90 degrees, and a guide transverse wheel (32) is provided at one end of the transverse clamping block (31) close to the through hole (11). Second U-shaped seats (34) are respectively installed at both ends of the guide transverse wheel (32), and the second U-shaped seats (34) are fixed on both sides of the end of the transverse clamping block (31).

Images