Rivet drawing device applied to riveting type bolt

Abstract

The invention provides a rivet drawing device applied to a riveting type bolt, and relates to the technical field of pressing rivet bolt fastening, the rivet drawing device comprises a correcting structure, a chuck and a rivet drawing device base, the correcting structure comprises a correcting tray, an erecting ring is integrally formed at the bottom of the correcting tray, a clamping shaft is integrally formed at one end of the erecting ring, and the clamping shaft is connected with the correcting tray. One end of the clamping shaft is clamped in the chuck, so that the correcting structure is vertically arranged; a plate is arranged at the top of the correcting tray, a plurality of positioning holes are formed in the plate, and pressing rivet bolts are arranged in the positioning holes; the technical key points are as follows: a pressing rivet bolt is in threaded connection with the interiors of a correcting tray and an erecting ring, so that the pressing rivet bolt presses a plate on the surface of the correcting tray through the head of the pressing rivet bolt, and the plate is kept in a horizontal state and is matched with the pressing rivet bolt which is in threaded connection with the interiors of the erecting ring and the correcting tray so as to keep a vertical state; and it is conveniently guaranteed that the plate and the pressing rivet bolt are perpendicular to each other after being riveted, and the machining quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of fastening riveted bolts, in particular to a riveting device applied to riveted bolts. Background Art

[0002] Compression rivet bolts are standard fasteners used for compression riveting. Compression rivet bolts are generally used in electronic mechanical equipment, metal sheet metal industry products, hardware stamping or copper, aluminum, plastic and other materials. When using and installing, the threaded end of the compression rivet bolt, that is, the tail end, needs to be pressed or other ways to squeeze it into the product material matrix.

[0003] The production process of self-clinching bolts is similar to that of ordinary screws. However, some self-clinching bolts are manufactured through lathe parts, and the specifications and dimensions obtained are more accurate and the tolerance range is more reasonable. Its production process is to first purchase the materials for producing self-clinching bolts, then order the corresponding molds, and then roll the threads after completing the heading work.

[0004] When existing self-clinching bolts are connected to plates, they mainly use stamped bolt heads to expand and squeeze into the circular holes of the plates, thereby achieving the effect of fixing the bolt heads and the plates. However, in the actual working process, there is a gap when the holes on the plates match the bolt heads. The part that the bolt heads first contact with the plates is difficult to always remain flat, and the bolts are easily tilted and fixed to the plates as a whole, resulting in the problem that the verticality between the bolts and the plates is difficult to meet the final application requirements. Summary of the invention

[0005] In order to overcome the problem that the existing self-clinching bolts are mainly connected to the plate by stamping the bolt head, so that it expands and squeezes into the circular hole of the plate. However, due to the gap between the hole on the plate and the bolt head, it is difficult to keep the part of the bolt head that first contacts the plate flat all the time, and it is easy for the bolt to be fixed to the plate as a whole, resulting in the verticality between the bolt and the plate being difficult to meet the final application requirements. The embodiment of the present application provides a riveting device for riveted bolts, which is threadedly connected to the inside of the correction tray and the mounting ring to allow the self-clinching bolt to pass through the correction tray and the mounting ring. The head of the plate is used to press the plate on the top of the correction drag ring, so that the first spring is compressed between the support plate and the correction drag ring. When the correction drag ring drops to the same plane as the correction drag plate, the auxiliary correction drag plate forms a support for the bottom surface of the plate, ensuring that the plate is kept horizontal through the correction of the correction drag plate and the correction drag ring, and cooperates with the rivet bolts that are threadedly connected to the inside of the mounting ring and the correction drag plate to maintain a vertical state. This makes it easy to ensure that the plate and the rivet bolts are perpendicular to each other after riveting, and the rivet bolts will not be tilted relative to the plate, thereby ensuring the processing quality.

[0006] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0007] A riveting device applied to riveted bolts comprises a correction structure, a chuck and a riveting device base, wherein the chuck is arranged at the bottom of the correction structure, the correction structure comprises a correction tray, a mounting ring is integrally formed at the bottom of the correction tray, a clamping shaft is integrally formed at one end of the mounting ring, and one end of the clamping shaft is clamped inside the chuck so that the correction structure is vertically arranged.

[0008] In a possible implementation, a motor is disposed inside the base of the riveting device, one end of the motor shaft is assembled with a power output gear, one end of the power output gear is meshingly connected with a control gear, a transmission sleeve is processed at the center of the control gear, an output shaft is sleeved inside the transmission sleeve, and one end of the output shaft is processed to one end of the chuck.

[0009] In a possible implementation, a second spring is sleeved inside the correction tray, a positioning rod is processed on the inner wall of one end of the transmission sleeve, the second spring is sleeved on the outside of the positioning rod, and the positioning rod is supported between one end of the output shaft and the transmission sleeve.

[0010] In a possible implementation, a plate is provided on the top of the correction tray, a plurality of positioning holes are processed inside the plate, and rivet bolts are provided inside the positioning holes. One end of the rivet bolts passes through the interior of the positioning holes and is threadedly connected to the interior of the mounting ring and the correction tray, and the surface of the correction tray is in contact with the bottom surface of the plate.

[0011] In a possible implementation, the correction drag plate is externally sleeved with a correction drag ring, a plurality of positioning slide rods are processed on the bottom of the correction drag ring, a first spring is externally sleeved with the plurality of positioning slide rods, a same support plate is externally sleeved with one end of the plurality of positioning slide rods, and a nut is threadedly connected to one end of the positioning slide rod so that the first spring is supported between the correction drag ring and the support plate.

[0012] In a possible implementation, a flange is assembled and connected to the outer wall of one end of the mounting ring, the support plate is sleeved on the outside of the mounting ring, and the flange and the support plate are fixed by bolts.

[0013] In a possible implementation, a safety ring is sleeved on the outside of the correction tray, and the safety ring is assembled to the top of the base of the riveting device. When the chuck moves from the top to the bottom, the safety ring forms support at the bottom.

[0014] In one possible implementation, a hydraulic cylinder is provided on the top of the chuck, and a pressure head is processed at one end of the hydraulic cylinder. The hydraulic cylinder controls the pressure head to move toward the bottom to pressurize the rivet bolt connected to the inside of the correction tray, so that the bolt head of the rivet bolt expands inside the positioning hole on the plate.

[0015] In a possible implementation, a vertical frame is assembled and connected to the top of one side of the base of the riveting device, two vertical plates are processed on the top of the vertical frame, and a fixed bracket is assembled and connected to one side of the two vertical plates, and the hydraulic cylinder is assembled to the top of the fixed bracket, and one end of the hydraulic cylinder passes through the interior of the fixed bracket.

[0016] The beneficial effects of this application are:

[0017] First, in this scheme, the rivet bolt is threadedly connected to the inside of the correction tray and the erection ring, so that the rivet bolt presses the plate on the top of the correction ring through its head, so that the first spring is compressed between the support plate and the correction ring. When the correction ring drops to the same plane as the correction tray, the auxiliary correction tray supports the bottom surface of the plate, ensuring that the plate is kept horizontal by the correction of the correction tray and the correction ring, and cooperates with the rivet bolt that is threadedly connected to the inside of the erection ring and the correction tray to keep it vertical, so that the plate and the rivet bolt are perpendicular to each other after riveting, and the rivet bolt will not be tilted relative to the plate, thereby ensuring the processing quality;

[0018] Second, in this solution, when the chuck drives the output shaft to move toward the bottom and compresses the second spring to the limit state, the safety ring assembled to the top of the base of the riveting device forms a support at the bottom to limit the chuck from continuing to move toward the bottom. This can correct the structure driving the chuck to move toward the bottom, which affects the coordination between the control gear and the power output gear, and eventually leads to abnormal transmission between the power output gear and the control gear.

[0019] Third, in this scheme, by utilizing a motor to control the rotation of the power output gear, and by using the control gear, transmission sleeve, output shaft, and chuck to drive the correction structure to rotate, one end of the plate can be controlled to be in a stationary state, so that the rivet bolts can be quickly withdrawn from the inside of the mounting ring and the correction tray without rotating the plate circle by circle. This is simple, convenient, and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a riveting device applied to a riveted bolt of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a correction structure of a riveting device applied to a riveted bolt of the present invention to correct the angle between the riveted bolt and the plate;

[0022] Figure 3 It is a schematic diagram of the installation position structure of a riveting device correction structure applied to a riveted bolt of the present invention;

[0023] Figure 4 This is one of the structural schematic diagrams of a correction structure of a riveting device applied to a riveted bolt of the present invention;

[0024] Figure 5 This is the second structural schematic diagram of a correction structure of a riveting device applied to a riveted bolt of the present invention.

[0025] Reference numerals:

[0026] 1. Base of the riveting device; 2. Safety ring; 3. Clamp; 4. Riveting bolt; 5. Plate; 6. Press head; 7. Hydraulic cylinder; 8. Fixed bracket; 9. Vertical plate;

[0027] 10. Correction structure; 101. Setting ring; 102. Clamping shaft; 103. Correction drag plate; 104. Support plate; 105. Correction drag ring; 106. Positioning slide bar; 107. First spring; 108. Nut; 109. Flange;

[0028] 11. Stand; 12. Positioning hole; 13. Transmission sleeve; 14. Control gear; 15. Power output gear; 16. Motor; 17. Output shaft; 18. Positioning rod; 19. Second spring. DETAILED DESCRIPTION

[0029] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0030] Embodiment 1:

[0031] This embodiment introduces a specific structure of a riveting device for riveted bolts. Figure 1-Figure 5 As shown, it includes a correction structure 10, a clamp 3 and a riveting device base 1 arranged at the bottom of the correction structure 10, the clamp 3, the correction structure 10 includes a correction tray 103, the bottom of the correction tray 103 is integrally formed with a mounting ring 101, and one end of the mounting ring 101 is integrally formed with a clamping shaft 102;

[0032] like Figure 2 As shown, a plate 5 is disposed on the top of the correction tray 103, a plurality of positioning holes 12 are processed inside the plate 5, and a rivet bolt 4 is disposed inside the positioning hole 12;

[0033] Among them, by passing one end of the rivet bolt 4 through the interior of the positioning hole 12 and being threadedly connected to the interior of the erection ring 101 and the correction tray 103, when the surface of the correction tray 103 is fitted with the bottom surface of the plate 5, the contact surface between the correction tray 103 and the plate 5 is larger than the contact surface between the rivet bolt 4 and the plate 5. When the bolt head of the rivet bolt 4 is squeezed and interference-fitted into the interior of the positioning hole 12, it can be ensured that the direction of the axis of the rivet bolt 4 is the same as the direction of the axis of the positioning hole 12;

[0034] Secondly, by clamping one end of the clamping shaft 102 inside the clamp 3, the clamp 3 is vertically arranged to keep the correction structure 10 in a vertical downward state, so that when the bolt head of the rivet bolt 4 is squeezed into the positioning hole 12, the rivet bolt 4 is subjected to axial pressure, thereby ensuring the tightness of the riveting and the strength after the riveting.

[0035] Furthermore, in order to further ensure that the correction structure 10 corrects the plate 5 to a horizontal state, when the rivet bolt 4 is threadedly connected to the inside of the erection ring 101 and the correction tray 103, it can be ensured that the bolt head of the rivet bolt 4 is punched into the inside of the positioning hole 12, and the rivet bolt 4 is ensured to be perpendicular to the plate 5 as a whole, such as Figures 3 to 5 As shown, the correction drag ring 105 is sleeved on the outside of the correction drag plate 103, and a plurality of positioning slide bars 106 are processed on the bottom of the correction drag ring 105. The outsides of the plurality of positioning slide bars 106 are sleeved with first springs 107, and the outsides of one end of the plurality of positioning slide bars 106 are sleeved with the same support plate 104. By threading a nut 108 at one end of the positioning slide bar 106, when the first spring 107 is supported between the correction drag ring 105 and the support plate 104, one end of the positioning slide bar 106 is separated from the inside of the support plate 104;

[0036] When the rivet bolt 4 is passed through the interior of the positioning hole 12 and is threadedly connected to the erection ring 101 and the correction tray 103, the plate 5 is pressed on the top of the correction tray 105, so that the positioning slide bar 106 slides to the bottom inside the support plate 104, and the first spring 107 is compressed between the correction tray 105 and the support plate 104, so that the entire correction structure 10 can lift the plate 5. On the premise of ensuring that the clamping head 3 at one end of the clamping shaft 102 is vertically set, it is beneficial for the plate 5 to be in a horizontal state, and the rivet bolt 4 is connected to the interior of the erection ring 101 and the correction tray 103, and must be kept vertical to the plate 5;

[0037] Furthermore, in order to facilitate fixing the support plate 104 to the outside of the erection ring 101, the correction drag ring 105 cooperates with the correction drag plate 103 to be supported on the bottom of the plate 5, as shown in FIG. Figure 5 As shown, the outer wall of one end of the mounting ring 101 is assembled with a flange 109. By making the support plate 104 sleeved on the outside of the mounting ring 101 and fixing the flange 109 and the support plate 104 with bolts, it can be ensured that the support plate 104 carrying the positioning slide rod 106, the first spring 107 and the correction drag ring 105 are located on the outside of the mounting ring 101.

[0038] Embodiment 2:

[0039] Based on Example 1, this example introduces a specific structure for controlling the rotation of the chuck 3, such as Figure 1 and Figure 2As shown, a motor 16 is arranged inside the base 1 of the riveting device, one end of the rotating shaft of the motor 16 is assembled and connected with a power output gear 15, one end of the power output gear 15 is meshed and connected with a control gear 14, a transmission sleeve 13 is processed at the center of the control gear 14, and an output shaft 17 is sleeved inside the transmission sleeve 13;

[0040] Among them, by processing one end of the output shaft 17 to one end of the chuck 3, after inserting one end of the output shaft 17 into the interior of the transmission sleeve 13, the motor 16 can control the power output gear 15 to rotate, thereby driving the control gear 14 to rotate, and finally controlling the output shaft 17 matched with the transmission sleeve 13 to rotate, so that the chuck 3 drives the correction structure 10 clamped at one end thereof to rotate;

[0041] Secondly, in order to prevent the clamp 3 from being subjected to pressure from the top to the bottom when clamping the correction structure 10, causing the control gear 14 and the power output gear 15 to make a mistake in matching, and eventually causing the gear teeth to break and other problems, such as Figure 3 As shown, the inside of the correction tray 103 is sleeved with a second spring 19, the inner wall of one end of the transmission sleeve 13 is processed with a positioning rod 18, and the outside of the correction tray 103 is sleeved with a safety ring 2. By sleeve-fitting the second spring 19 to the outside of the positioning rod 18, the positioning rod 18 is supported between one end of the output shaft 17 and the transmission sleeve 13, and the safety ring 2 is assembled to the top of the riveting device base 1. When the output shaft 17 is affected by the correction structure 10 at one end of the chuck 3 and moves from the top to the bottom, the second spring 19 can be pressed first, thereby avoiding direct rigid transmission, so that the control gear 14 moves to the bottom on one side of the power output gear 15;

[0042] At the same time, when the chuck 3 drives the output shaft 17 to move toward the bottom and compresses the second spring 19 to the limit state, the safety ring 2 assembled to the top of the riveting device base 1 can form a support at its bottom to prevent the output shaft 17 from moving inside the transmission sleeve 13 and still driving the control gear 14 fixed on the outside of the transmission sleeve 13 to move to the bottom on one side of the power output gear 15.

[0043] Embodiment 3:

[0044] Based on Example 1 and Example 2, this example introduces the specific structure of the chuck 3. A hydraulic cylinder 7 is provided on the top of the chuck 3, and a pressure head 6 is processed at one end of the hydraulic cylinder 7.

[0045] The hydraulic cylinder 7 controls the pressure head 6 to move toward the bottom to pressurize the rivet bolt 4 connected to the inside of the correction tray 103, so that the bolt head of the rivet bolt 4 expands inside the positioning hole 12 on the plate 5, thereby connecting and fixing the rivet bolt 4 to the plate 5;

[0046] At the same time, in order to carry the hydraulic cylinder 7 on the top of the correction structure 10, the hydraulic cylinder 7 is vertically pressed on the pressure riveting bolt 4 on the plate 5, such as Figure 1 As shown, a vertical frame 11 is assembled and connected to the top of one side of the base 1 of the riveting device, and two vertical plates 9 are processed on the top of the vertical frame 11. A fixed bracket 8 is assembled and connected to one side of the two vertical plates 9. By assembling the hydraulic cylinder 7 to the top of the fixed bracket 8 so that one end of the hydraulic cylinder 7 passes through the inside of the fixed bracket 8, one end of the rivet bolt 4 can be pressed against the inside of the positioning hole 12 on the plate 5 while ensuring that the fixed bracket 8 is set horizontally.

[0047] Specifically, when the riveting device applied to the riveted bolt is used to connect the rivet bolt 4 and the plate 5:

[0048] First, the rivet bolt 4 is passed through the positioning hole 12 (which is processed to the inside of the plate 5) to determine the matching state of the rivet bolt 4 and the plate 5;

[0049] Then, one end of the clamping shaft 102 on the correction structure 10 is clamped on the top of the clamping head 3, so that the clamping shaft 102 drives the entire correction structure 10 vertically downward; the rivet bolt 4 is threadedly connected to the inside of the correction drag plate 103 and the erection ring 101, so that the rivet bolt 4 presses the plate 5 on the top of the correction drag ring 105 through its head, so that the first spring 107 is compressed between the support plate 104 and the correction drag ring 105 (the positioning slide rod 106 moves from the top to the bottom along with the correction drag ring 105). The top of the plate 5 moves and slides inside the support plate 104 until the correction ring 105 drops to the same plane as the correction tray 103. The auxiliary correction tray 103 supports the bottom surface of the plate 5 to ensure that the plate 5 is kept horizontal by the correction of the correction tray 103 and the correction ring 105. The rivet bolt 4 is threadedly connected to the inside of the erection ring 101 and the correction tray 103, thereby maintaining a vertical state, which is convenient for ensuring that the plate 5 and the rivet bolt 4 remain vertical.

[0050] Next, the hydraulic cylinder 7 assembled to the top of one side of the fixed bracket 8 is started. When one end of the hydraulic cylinder 7 extends from the inside of the fixed bracket 8 and presses the bolt head of the rivet bolt 4, the rivet bolt 4 is directly pressurized, driving the correction structure 10 to move toward the top as a whole, and compressing the second spring 19 with the help of the output shaft 17 on the chuck 3 (because one end of the clamping shaft 102 on the correction structure 10 is clamped on one end of the chuck 3, and the output shaft 17 at the other end of the chuck 3 is sleeved in the inside of the transmission sleeve 13);

[0051] At the same time, when the chuck 3 drives the output shaft 17 to move toward the bottom and compresses the second spring 19 to the limit state, the safety ring 2 assembled to the top of the riveting device base 1 forms a support at the bottom thereof, limiting the chuck 3 from continuing to move toward the bottom, thereby preventing the output shaft 17 from moving inside the transmission sleeve 13 and still driving the control gear 14 fixed outside the transmission sleeve 13 to move toward the bottom on one side of the power output gear 15, thereby affecting the coordination between the control gear 14 and the power output gear 15, and finally causing problems such as gear tooth collapse;

[0052] Finally, by using the base 1 of the riveting device, the safety ring 2, the chuck 3 and the correction structure 10 to form a support at the bottom of the plate 5, the rivet bolt 4 can be deformed and expanded in the positioning hole 12 on the plate 5, thereby fixing the rivet bolt 4 and the plate 5. It is only necessary to control the plate 5 to drive the rivet bolt 4 to rotate and unscrew the threaded part of the rivet bolt 4 from the inside of the mounting ring 101 and the correction tray 103.

[0053] In addition, when the hydraulic cylinder 7 presses the rivet bolt 4 into the positioning hole 12 on the plate 5 through the pressure head 6, the plate 5 is pressed against the surface of the correction tray 103 by threading the setting ring 101 and the correction tray 103 on the outside of the rivet bolt 4 (i.e., simulating the traditional riveting action, but without a core rod, so that the end of the rivet bolt 4 fits the surface of the plate 5), which can ensure that the riveting work is completed smoothly. After completion, the motor 16 is started to control the power output gear 15 to rotate, thereby driving the control gear 14 to rotate, and finally controlling the output shaft 17 matched with the transmission sleeve 13 to rotate, so that the chuck 3 drives the correction structure 10 clamped at one end thereof to rotate, so that when controlling one end of the plate 5, the rivet bolt 4 can be quickly withdrawn from the inside of the setting ring 101 and the correction tray 103 without rotating the plate 5 circle by circle.

[0054] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A riveting device for riveted bolts, characterized in that: include: Correction structure (10); A chuck (3) disposed at the bottom of the correction structure (10); A riveting device base (1); The correction structure (10) comprises a correction tray (103), a mounting ring (101) is integrally formed at the bottom of the correction tray (103), a clamping shaft (102) is integrally formed at one end of the mounting ring (101), and one end of the clamping shaft (102) is clamped inside the chuck (3), so that the correction structure (10) is arranged vertically.

2. A riveting device for riveted bolts according to claim 1, characterized in that: A motor (16) is arranged inside the base (1) of the riveting device, one end of the rotating shaft of the motor (16) is assembled and connected to a power output gear (15), one end of the power output gear (15) is meshingly connected to a control gear (14), a transmission sleeve (13) is processed at the center of the control gear (14), an output shaft (17) is sleeved inside the transmission sleeve (13), and one end of the output shaft (17) is processed to one end of the chuck (3).

3. A riveting device for riveted bolts according to claim 2, characterized in that: A second spring (19) is sleeved inside the correction tray (103), and a positioning rod (18) is processed on the inner wall of one end of the transmission sleeve (13); The second spring (19) is sleeved on the outside of the positioning rod (18), and the positioning rod (18) is supported between one end of the output shaft (17) and the transmission sleeve (13).

4. A riveting device for riveted bolts according to claim 1, characterized in that: A plate (5) is arranged on the top of the correction tray (103), a plurality of positioning holes (12) are processed inside the plate (5), and rivet bolts (4) are arranged inside the positioning holes (12); One end of the rivet bolt (4) passes through the interior of the positioning hole (12) and is threadedly connected to the interior of the mounting ring (101) and the correction tray (103), and the surface of the correction tray (103) is in contact with the bottom surface of the plate (5).

5. The riveting device for riveted bolts according to claim 1, characterized in that: The correction drag plate (103) is sleeved with a correction drag ring (105) on its exterior, and a plurality of positioning slide bars (106) are processed on the bottom of the correction drag ring (105). The exteriors of the plurality of positioning slide bars (106) are sleeved with a first spring (107). The exteriors of one end of the plurality of positioning slide bars (106) are sleeved with a same support plate (104). One end of the positioning slide bar (106) is threadedly connected to a nut (108) so that the first spring (107) is supported between the correction drag ring (105) and the support plate (104).

6. A riveting device for riveted bolts according to claim 5, characterized in that: The outer wall of one end of the mounting ring (101) is assembled with a flange (109), the support plate (104) is sleeved on the outside of the mounting ring (101), and the flange (109) and the support plate (104) are fixed by bolts.

7. A riveting device for riveted bolts according to claim 1, characterized in that: The correction tray (103) is sleeved with a safety ring (2) on its exterior. The safety ring (2) is assembled to the top of the riveting device base (1). When the clamp (3) moves from the top to the bottom, the safety ring (2) forms support at its bottom.

8. The riveting device for riveted bolts according to claim 1, characterized in that: A hydraulic cylinder (7) is arranged on the top of the chuck (3), and a pressure head (6) is processed on one end of the hydraulic cylinder (7); The hydraulic cylinder (7) controls the pressure head (6) to move toward the bottom to apply pressure to the rivet bolt (4) connected to the inside of the correction tray (103), so that the bolt head of the rivet bolt (4) expands inside the positioning hole (12) on the plate (5).

9. A riveting device for riveted bolts according to claim 8, characterized in that: A stand (11) is assembled and connected to the top of one side of the base (1) of the riveting device, two stand plates (9) are processed on the top of the stand (11), and a fixed bracket (8) is assembled and connected to one side of the two stand plates (9); The hydraulic cylinder (7) is assembled to the top of the fixed bracket (8), and one end thereof passes through the interior of the fixed bracket (8).

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