All-aluminum alloy plate buckle type scaffold system

Abstract

The utility model relates to the technical field of scaffolds, in particular to an all-aluminum alloy plate buckle type scaffold system which comprises a vertical rod, a transverse rod, a diagonal draw bar, a starting sleeve, an adjustable base and an adjustable jacking, the vertical rod and the adjustable base are located at the two ends of the starting sleeve correspondingly, the adjustable jacking is located at the top of the vertical rod, and connecting plates are arranged on the starting sleeve and the vertical rod correspondingly; a plurality of pin holes are formed in the connecting discs in the circumferential direction of the axes of the connecting discs, the multiple connecting discs are arranged in the axis direction of the vertical rod, and plug pins are inserted into the ends of the cross rods and the diagonal draw bars and used for being matched with the pin holes in an inserted mode. The construction method has the effects of being light in weight, high in strength, easy to assemble and disassemble, high in construction efficiency and high in safety.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of scaffolds, in particular to a full-aluminum alloy disc-buckle type scaffold system. BACKGROUND

[0002] The disc-buckle type scaffold is a steel pipe support with a structure geometry invariant system formed by connecting a sleeve or a pipe socket, connecting a horizontal rod and an inclined rod by a rod end buckle joint, and connecting a wedge-shaped latch, and is mainly applied to tunnel engineering, workshops, stages and indoor and outdoor decoration.

[0003] A Chinese patent with the publication number CN221346276U discloses a wall fastener type scaffold wall connecting assembly, which comprises a wall body and a plurality of steel pipe bodies arranged on one side of the wall body and a plurality of fastener bodies arranged between the steel pipe bodies.

[0004] In the above technology, the construction personnel need to tighten the bolts on the fastener bodies to erect the steel pipe bodies into a scaffold, and the number of fastener bodies required on the scaffold is usually large, so the workload of the construction personnel in tightening the bolts on the fastener bodies is large. Even if the construction personnel use a power tool to tighten, the construction personnel need to hold the power tool for a long time, and the fastener bodies are usually made of cast iron and are heavy, so the construction personnel need to carry the fastener bodies and move them on the scaffold, which greatly consumes the physical strength and energy of the construction personnel, resulting in construction risks, which is a problem to be solved at present. Practical new type content

[0005] In order to improve the problems existing in the erection of the fastener type scaffold, the application provides a full-aluminum alloy disc-buckle type scaffold system.

[0006] The full-aluminum alloy disc-buckle type scaffold system provided by the application adopts the following technical scheme:

[0007] A full-aluminum alloy disc-buckle type scaffold system, which comprises a vertical rod, a horizontal rod, an inclined rod, a starting sleeve, an adjustable base and an adjustable top support, the vertical rod and the adjustable base are respectively located at two ends of the starting sleeve, the adjustable top support is located at the top of the vertical rod, the starting sleeve and the vertical rod are both provided with a connecting disc, a plurality of pin holes are formed on the connecting disc along the circumferential direction of the axis of the connecting disc, a plurality of connecting discs are arranged along the axis direction of the vertical rod, the end of the horizontal rod and the end of the inclined rod are both inserted with a latch, and the latch is used for inserting and cooperating with the pin hole.

[0008] By adopting the technical scheme, the construction personnel connects the vertical rods, the horizontal rods and the inclined rods through the pins, and installs the adjustable base and the adjustable support at the bottom and the top of the erected scaffold, so that the scaffold is quickly erected, the pin is light in weight, the construction personnel consumes less physical strength, the pin is convenient to plug, is self-locked by the gravity of the pin, the stability of the scaffold structure is ensured, and the safety and the erection efficiency of the scaffold are improved.

[0009] Optionally, the adjustable base comprises a bottom plate, a supporting screw rod is arranged on the bottom plate, a supporting nut is threadedly connected to the supporting screw rod, and the starting sleeve is coaxially sleeved on the supporting screw rod.

[0010] By adopting the technical scheme, when the construction ground is uneven, the construction personnel adjusts the distance between the starting sleeve and the construction ground by screwing the supporting nut, so that the starting sleeves on the same scaffold are at the same height, the stability of the scaffold structure is improved, and the safety of the scaffold is further improved.

[0011] Optionally, the adjustable support comprises a top plate in the shape of U in cross section, a jacking screw rod is arranged on the top plate, a stopper is threadedly connected to the jacking screw rod, the jacking screw rod is inserted into the top of the vertical rod, and the stopper is used to abut against the top of the vertical rod.

[0012] By adopting the technical scheme, the construction personnel adjusts the distance between the top plate and the top of the vertical rod by screwing the stopper, so that the top plates at the top of the scaffold are at the same height, and the objects placed on the top plates by the construction personnel are at the same height.

[0013] Optionally, the pin comprises a main pin body and an anti-drop piece, the anti-drop piece is rotationally connected to the main pin body, a spring piece is arranged between the anti-drop piece and the main pin body, a locking piece is arranged on the main pin body, and the locking piece fixes the anti-drop piece on the main pin body.

[0014] By adopting the technical scheme, when the construction personnel inserts the pin into the pin hole on the connecting disc, the construction personnel releases the locking effect of the locking piece, the spring piece restores the deformation and pops up the anti-drop piece, so that the possibility of accidental falling of the pin from the connecting disc is reduced, and the stability of the scaffold structure is improved.

[0015] Optionally, the locking member comprises an end block slidingly arranged on the kingpin, the end block is provided with a protrusion, the anti-disengaging sheet is provided with a groove for clamping the protrusion, the end block is provided with a guide rod, the guide rod is provided with a baffle, the kingpin is provided with a locking groove for sliding of the baffle, and the baffle and the locking groove of the kingpin are supported by a compression spring.

[0016] By adopting the above technical scheme, when the bolt passes through the pin hole on the connecting disc, the operator pulls the end block, the end block drives the baffle to press the compression spring through the guide rod, the compression spring is deformed under pressure, at the same time, the end block drives the protrusion to separate from the groove on the anti-disengaging sheet, the anti-disengaging sheet is unfolded under the action of the spring sheet, then the operator releases the end block, the compression spring restores the deformation and drives the end block to reset through the guide rod.

[0017] Optionally, the connecting disc is coaxially and rotatably provided with a positioning ring, a plurality of avoiding grooves are uniformly arranged on the positioning ring in the circumferential direction, and a disengaging groove is arranged on the bolt for clamping the positioning ring.

[0018] By adopting the above technical scheme, before the operator inserts the bolt, the operator rotates the positioning ring to make the avoiding grooves on the positioning ring communicate with the pin hole, then the operator inserts the bolt into the pin hole, in this process, the bolt and the avoiding grooves on the positioning ring are in sliding cooperation until the disengaging groove on the bolt communicates with the avoiding grooves on the positioning ring, then the operator rotates the positioning ring, the avoiding grooves on the positioning ring are dislocated with the disengaging groove on the bolt, at this time, the edge of the positioning ring is clamped at the disengaging groove on the bolt, thereby reducing the possibility of accidental disengagement of the bolt from the connecting disc.

[0019] Optionally, the diagonal pull rod comprises a first unit pipe and a second unit pipe, a guide column is coaxially arranged on the first unit pipe, the guide column is coaxially and slidingly matched with the second unit pipe, a plurality of ring grooves are uniformly arranged on the guide column along the axial direction of the guide column, a plurality of arc pieces are coaxially and uniformly arranged on the second unit pipe in the circumferential direction, the arc pieces are provided with tooth blocks, and the second unit pipe is provided with a pressing member for pressing the tooth blocks into the ring grooves on the guide column.

[0020] By adopting the above technical scheme, the operator pulls the first unit pipe, the first unit pipe drives the guide column and the second unit pipe to relatively slide, then the tooth blocks on the second unit pipe are clamped on the ring grooves on the guide column through the pressing member, so as to adjust the length between the first unit pipe and the second unit pipe, and further adapt to the needs of different diagonal pull distances on the scaffold.

[0021] Optionally, the pressing member comprises a pressing nut screwed on the second unit pipe, and a wedge is arranged on the side of the arc piece opposite to the tooth block, and a guide inclined surface is formed on the wedge, and the guide inclined surface is inclined downward toward the pressing nut along the direction from the wedge to the tooth block.

[0022] By adopting the above technical scheme, the construction personnel twists the pressing nut, the pressing nut approaches and gradually abuts against the guide inclined surface on the wedge, the reaction force of the wedge abutting against the pressing nut causes the arc piece to drive the tooth block to be clamped in the ring groove on the guide column, so that the length between the first unit pipe and the second unit pipe is extended.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The construction personnel connects the vertical rods, the horizontal rods and the inclined rods through the pins, and installs the adjustable bases and the adjustable jacks at the bottom and the top of the erected scaffold, so that the scaffold is quickly erected, the pins are light in weight, the construction personnel consumes less physical strength, the pin is convenient to plug, is self-locked by relying on the gravity of the pin, the stability of the scaffold structure is ensured, and the safety and the erection efficiency of the scaffold are improved.

[0025] 2. When the pin passes through the pin hole on the connecting disc, the construction personnel pulls the end block, the end block drives the baffle to extrude the compression spring through the guide rod, the compression spring is deformed under pressure, the end block drives the convex block to be separated from the recess on the anti-dropping piece, the anti-dropping piece is unfolded under the action of the spring piece, then the construction personnel releases the end block, the compression spring restores the deformation and drives the end block to reset through the guide rod.

[0026] 3. Before the construction personnel inserts the pin, the construction personnel rotates the positioning ring, so that the avoiding slot on the positioning ring is in communication with the pin hole, then the construction personnel inserts the pin into the pin hole, in this process, the pin and the avoiding slot on the positioning ring are in sliding fit, until the anti-dropping slot on the pin is in communication with the avoiding slot on the positioning ring, then the construction personnel rotates the positioning ring, the avoiding slot on the positioning ring is dislocated with the anti-dropping slot on the pin, at this time, the edge of the positioning ring is clamped at the anti-dropping slot on the pin, so that the possibility that the pin is accidentally dropped from the connecting disc is reduced.

[0027] 4. The construction personnel twists the pressing nut, the pressing nut approaches and gradually abuts against the guide inclined surface on the wedge, the reaction force of the wedge abutting against the pressing nut causes the arc piece to drive the tooth block to be clamped in the ring groove on the guide column, so that the length between the first unit pipe and the second unit pipe is extended. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic view of embodiment 1 of the present application.

[0029] Figure 2 isFigure 1 Enlarged view of part A.

[0030] Figure 3 Figure 1 Enlarged view of part B.

[0031] Figure 4 It is a structural schematic diagram of the position relationship of the main pin body, the anti-drop sheet and the end block in the embodiment 2 of the present application.

[0032] Figure 5 It is a sectional view of the position relationship of the spring sheet, the guide rod and the compression spring in the embodiment 2 of the present application.

[0033] Figure 6 It is a structural schematic diagram of the position relationship of the positioning ring, the bolt and the connecting disc in the embodiment 3 of the present application.

[0034] Figure 7 It is a sectional view of the position relationship of the compression nut, the guide column and the arc sheet in the embodiment 4 of the present application.

[0035] BRIEF DESCRIPTION OF THE DRAWINGS: 1, vertical rod; 2, horizontal rod; 3, diagonal rod; 31, first unit pipe; 32, second unit pipe; 33, guide column; 34, ring groove; 35, arc sheet; 36, tooth block; 37, compression part; 371, compression nut; 372, wedge block; 373, guide inclined surface; 4, starting sleeve; 5, adjustable base; 51, bottom plate; 52, support screw; 53, support nut; 6, adjustable top support; 61, top plate; 62, jacking screw; 63, stop block; 7, connecting disc; 8, pin hole; 9, bolt; 91, main pin body; 92, anti-drop sheet; 93, spring sheet; 10, locking part; 101, end block; 102, protruding block; 103, recess; 104, guide rod; 105, baffle; 106, locking groove; 107, compression spring; 11, positioning ring; 12, avoiding notch; 13, anti-drop notch; 14, rib plate. DETAILED DESCRIPTION

[0036] The following will be described in detail in combination with the accompanying drawings. Figures 1-7 The present application will be further described in detail.

[0037] The embodiment of the present application discloses a full aluminum alloy disc buckle type scaffold system.

[0038] Embodiment 1

[0039] Referring to Figure 1 A full aluminum alloy disc buckle type scaffold system comprises a vertical rod 1, a horizontal rod 2, a diagonal rod 3, a starting sleeve 4, an adjustable base 5 and an adjustable top support 6, and the vertical rod 1, the horizontal rod 2, the diagonal rod 3 and the starting sleeve 4 can be made of aluminum alloy material in the prior art.

[0040] ​The aluminum alloy material is used to make the scaffold, so that the scaffold has the effects of light weight and corrosion resistance, the frequency of maintaining the scaffold is reduced, the total cost is reduced, and the non-magnetic property of the aluminum alloy can adapt to the non-magnetic requirement of special projects.

[0041] With reference to Figure 1 , Figure 2 and Figure 3 , the vertical rod 1 and the adjustable base 5 are located at two ends of the starting sleeve 4 respectively, the adjustable base 5 comprises a bottom plate 51, a vertical supporting screw rod 52 is welded on the bottom plate 51, a supporting nut 53 is threadedly connected on the supporting screw rod 52, the starting sleeve 4 is coaxially sleeved on the supporting screw rod 52, and the supporting nut 53 is used for abutting against the starting sleeve 4.

[0042] With reference to Figure 1 , Figure 2 and Figure 3 , the adjustable top support 6 is located at the top of the vertical rod 1, the adjustable top support 6 comprises a top plate 61 in the shape of U, a vertical jacking screw rod 62 is welded on the top plate 61, a rib plate 14 is welded between the top plate 61 and the jacking screw rod 62, a stop block 63 is threadedly connected on the jacking screw rod 62, the jacking screw rod 62 is inserted into the top of the vertical rod 1, and the stop block 63 is used for abutting against the top of the vertical rod 1.

[0043] With reference to Figure 1 , Figure 2 and Figure 3 , the starting sleeve 4 and the vertical rod 1 are both welded with a connecting disc 7, a plurality of pin holes 8 are formed on the connecting disc 7 in the circumferential direction along the axis of the connecting disc 7, a plurality of the connecting disc 7 are welded along the axis direction of the vertical rod 1, the end portions of the cross rod 2 and the inclined pull rod 3 are both inserted with a plug pin 9, and the plug pin 9 is used for plug pin cooperation with the pin hole 8.

[0044] The construction personnel sleeves the starting sleeve 4 on the supporting screw rod 52 and abuts the starting sleeve 4 against the supporting nut 53, a plurality of starting sleeves 4 are repeatedly operated and installed, then the cross rod 2 is fixed on the connecting disc 7 of the starting sleeve 4 through the plug pin 9, then the supporting nut 53 is screwed to make the plurality of starting sleeves 4 at the same height, so as to form the bottom foundation of the scaffold.

[0045] Then the vertical rod 1 is inserted on the starting sleeve 4, and the plurality of vertical rods 1 are fixed and connected through the plug pin 9 and the cross rod 2, then the inclined pull rod 3 is fixed on the vertical rod 1 through the plug pin 9, the scaffold is repeatedly operated and erected, finally the jacking screw rod 62 is inserted into the top of the vertical rod 1 at the uppermost of the scaffold, and then the stop block 63 is screwed to adjust the position of the top plate 61.

[0046] The implementation principle of the embodiment 1 is that the aluminum alloy material is used to make the scaffold, so that the scaffold has the effects of light weight and corrosion resistance, the frequency of maintaining the scaffold is reduced, the total cost is reduced, and the non-magnetic property of the aluminum alloy can adapt to the non-magnetic requirement of special projects.

[0047] The construction personnel put the starting sleeves 4 on the supporting screw rods 52 and make the starting sleeves 4 abut against the supporting nuts 53, repeatedly install multiple starting sleeves 4, then fix the cross bars 2 on the connecting plates 7 on the starting sleeves 4 through the pins 9, then twist the supporting nuts 53 to make the multiple starting sleeves 4 at the same height, thereby forming the bottom foundation of the scaffold.

[0048] Then the vertical rods 1 are inserted on the starting sleeves 4 and fixed and connected between the multiple vertical rods 1 through the pins 9 and the cross bars 2, then the diagonal rods 3 are fixed on the vertical rods 1 through the pins 9, the scaffold is repeatedly erected, finally the jacking screw rod 62 is inserted into the top of the vertical rod 1 at the uppermost of the scaffold, then the stopper 63 is twisted to adjust the position of the top plate 61.

[0049] Embodiment 2

[0050] With reference to Figure 4 and Figure 5 , the difference between this embodiment and embodiment 1 is that the pin 9 comprises a main pin body 91 and an anti-falling piece 92, the anti-falling piece 92 is rotationally connected to the main pin body 91, a spring piece 93 is arranged between the anti-falling piece 92 and the main pin body 91, the main pin body 91 is arranged with the locking piece 10, and the locking piece 10 fixes the anti-falling piece 92 on the main pin body 91.

[0051] With reference to Figure 4 and Figure 5 , the locking piece 10 comprises an end block 101 which is slidably arranged on the main pin body 91, the end block 101 is integrally formed with a protruding block 102, the anti-falling piece 92 is provided with a recessed groove 103 for clamping the protruding block 102, the end block 101 is welded with a guide rod 104, the guide rod 104 is welded with a baffle 105, the main pin body 91 is provided with a locking groove 106 for sliding of the baffle 105, and the baffle 105 and the locking groove 106 on the main pin body 91 are supported by a compression spring 107.

[0052] The implementation principle of embodiment 2 is that when the construction personnel inserts the pin 9 into the pin hole 8 on the connecting plate 7, the construction personnel pulls the end block 101, the end block 101 drives the baffle 105 to press the compression spring 107 through the guide rod 104, the compression spring 107 is deformed under pressure, at the same time, the end block 101 drives the protruding block 102 to separate from the recessed groove 103 on the anti-falling piece 92, the spring piece 93 restores the deformation, the anti-falling piece 92 is unfolded under the restoring force of the spring piece 93, then the construction personnel releases the end block 101, the compression spring 107 restores the deformation and drives the end block 101 to reset through the guide rod 104, thereby preventing the pin 9 from accidentally falling off the connecting plate 7.

[0053] Embodiment 3

[0054] With reference to Figure 6The difference between the embodiment and the embodiment 1 is that the coaxial rotating sleeve on the connecting disc 7 is provided with a positioning ring 11, a plurality of avoiding notches 12 are uniformly arranged on the positioning ring 11 in the circumferential direction, and a anti-loosing notch 13 is arranged on the bolt 9, and the anti-loosing notch 13 is used for clamping the positioning ring 11.

[0055] The implementation principle of the embodiment 4 is that the construction personnel pull the first unit pipe 31, the first unit pipe 31 drives the guide column 33 to relatively slide with the second unit pipe 32, then the construction personnel twist the compression nut 371, the compression nut 371 is close to and gradually abuts against the guide inclined surface 373 on the wedge block 372, the reaction force of the wedge block 372 abutting against the compression nut 371 makes the arc piece 35 drive the tooth block 36 to be clamped on the annular groove 34 on the guide column 33, so that the length of the inclined pull rod 3 is changed.

[0056] Embodiment 4

[0057] Reference Figure 7 The difference between the embodiment and the embodiment 1 is that the inclined pull rod 3 comprises a first unit pipe 31 and a second unit pipe 32, a guide column 33 is coaxially welded on the first unit pipe 31, the guide column 33 is coaxially and slidingly matched with the second unit pipe 32, a plurality of annular grooves 34 are uniformly arranged on the guide column 33 along the axial direction, a plurality of arc pieces 35 are coaxially and uniformly welded on the second unit pipe 32 in the circumferential direction, the arc piece 35 can be made of elastic metal material, and a tooth block 36 is welded on the arc piece 35.

[0058] Reference Figure 7 The second unit pipe 32 is provided with a compression member 37, the compression member 37 is used for compressing the tooth block 36 in the annular groove 34 on the guide column 33, the compression member 37 comprises a compression nut 371 which is screwed on the second unit pipe 32, a wedge block 372 is welded on the side of the arc piece 35 which is away from the tooth block 36, a guide inclined surface 373 is arranged on the wedge block 372, and the guide inclined surface 373 is inclined downward towards the compression nut 371 along the direction from the wedge block 372 to the tooth block 36.

[0059] The implementation principle of the embodiment 4 is that the construction personnel pull the first unit pipe 31, the first unit pipe 31 drives the guide column 33 to relatively slide with the second unit pipe 32, then the construction personnel twist the compression nut 371, the compression nut 371 is close to and gradually abuts against the guide inclined surface 373 on the wedge block 372, the reaction force of the wedge block 372 abutting against the compression nut 371 makes the arc piece 35 drive the tooth block 36 to be clamped on the annular groove 34 on the guide column 33, so that the length of the inclined pull rod 3 is changed.

[0060] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. An all-aluminum alloy disc-bolted scaffold system, characterized by: The utility model provides a kind of adjustable support, including vertical pole (1), crossbar (2), inclined pull rod (3), starting sleeve (4), adjustable base (5) and adjustable top support (6), the vertical pole (1) and the adjustable base (5) are located at the two ends of the starting sleeve (4) respectively, the adjustable top support (6) is located at the top of the vertical pole (1), the starting sleeve (4) and the vertical pole (1) are provided with connecting disc (7), a plurality of pin holes (8) are opened in the circumferential direction of the axis of connecting disc (7), connecting disc (7) is provided with multiple along the axis direction of vertical pole (1), the end of crossbar (2) and inclined pull rod (3) is inserted with insertion pin (9), and insertion pin (9) is used to be inserted with pin hole (8) matched.

2. An all-aluminum alloy disc-bolt scaffold system according to claim 1, characterized in that: The adjustable base (5) includes a bottom plate (51), the bottom plate (51) is provided with a support screw (52), the support screw (52) is threadedly connected with a support nut (53), the starting sleeve (4) is coaxially sleeved on the support screw (52), and the support nut (53) is used to abut against the starting sleeve (4).

3. The all-aluminum alloy disc buckle type scaffold system according to claim 1, characterized in that: The adjustable top support (6) includes a top plate (61) with a U-shaped cross section, the top plate (61) is provided with a jacking screw (62), the jacking screw (62) is threadedly connected with a stop block (63), the jacking screw (62) is inserted into the top of the vertical pole (1), and the stop block (63) is used to abut against the top of the vertical pole (1).

4. The all-aluminum alloy disc buckle type scaffold system according to claim 1, characterized in that: The insertion pin (9) includes a main pin body (91) and an anti-drop piece (92), the anti-drop piece (92) is rotatably connected to the main pin body (91), a spring piece (93) is arranged between the anti-drop piece (92) and the main pin body (91), the main pin body (91) is provided with a locking member (10), and the locking member (10) fixes the anti-drop piece (92) on the main pin body (91).

5. An all-aluminum alloy disc-bolt scaffold system according to claim 4, characterized in that: The locking member (10) includes an end block (101) slidably arranged on the main pin body (91), the end block (101) is provided with a protruding block (102), the anti-drop piece (92) is provided with a groove (103) for clamping the protruding block (102), the end block (101) is provided with a guide rod (104), the guide rod (104) is provided with a baffle (105), the main pin body (91) is provided with a locking groove (106) for sliding the baffle (105), and the baffle (105) and the locking groove (106) on the main pin body (91) are supported by a compression spring (107).

6. An all-aluminum alloy disc-bolt scaffold system according to claim 1, characterized in that: A positioning ring (11) is coaxially rotatably arranged on the connecting disc (7), a plurality of avoiding notches (12) are uniformly arranged on the positioning ring (11) in the circumferential direction, and an anti-drop notch (13) is arranged on the insertion pin (9) for clamping the positioning ring (11).

7. An all-aluminum alloy disc-bolt scaffold system according to claim 1, wherein: The inclined pull rod (3) comprises a first unit pipe (31) and a second unit pipe (32), a guide column (33) is coaxially arranged on the first unit pipe (31), the guide column (33) is coaxially and slidingly matched with the second unit pipe (32), a plurality of ring grooves (34) are uniformly arranged on the guide column (33) along the axial direction of the guide column (33), a plurality of arc pieces (35) are uniformly arranged on the second unit pipe (32) in a coaxial and circumferential manner, a tooth block (36) is arranged on the arc piece (35), and a pressing piece (37) is arranged on the second unit pipe (32), the pressing piece (37) is used for pressing the tooth block (36) into the ring groove (34) on the guide column (33).

8. An all-aluminum alloy disc-bolt scaffold system according to claim 7, characterized in that: The pressing piece (37) comprises a pressing nut (371) which is threadedly connected to the second unit pipe (32), a wedge block (372) is arranged on one side of the arc piece (35) which is away from the tooth block (36), a guide inclined surface (373) is arranged on the wedge block (372), and the guide inclined surface (373) is inclined downward toward the pressing nut (371) along the direction from the wedge block (372) to the tooth block (36).

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