A mobile control counter fixing device

Abstract

The present invention relates to the technical field related to mobile control counters, and discloses a mobile control counter fixing device, which drives a one-way fastening sleeve to rotate in one direction through a pendulum driving mechanism and a series of transmission mechanisms, and then drives a fixing bolt to rotate in one direction. In this way, when encountering a large amplitude shaking, the metal pendulum in the pendulum driving mechanism will swing accordingly, driving the fixing bolt to rotate, so that the fixing bolt is locked. At the same time, the pendulum driving mechanism drives the pump air piston to move back and forth, and cooperates with the one-way valves at the suction port and the exhaust port to continuously pump the air in the bottom sealing groove to the outside, thereby forming a vacuum in the bottom sealing groove. In this way, the bottom sealing groove becomes a suction cup, which firmly absorbs and fixes the mobile control counter to the ground, thereby increasing the stability. In addition, it can also reduce the oxygen content in the bottom sealing groove, reduce the rust rate of the fixing bolts and other metal parts in harsh environments, and ensure the life of the device.

Description

Technical Field

[0001] The present invention relates to the technical field related to control counters, and in particular to a mobile control counter fixing device. Background Art

[0002] In complex and changing dynamic environments such as ships, offshore platforms, and mobile work vehicles, control cabinets are key equipment and their stability and safety are of vital importance. These environments are often accompanied by continuous vibration, shaking, and unstable ground conditions, which poses great challenges to the fixation of control cabinets.

[0003] Traditionally, control counters are often fixed directly to the base or deck with multiple sets of bolts in these situations to ensure that they are stable and immovable. However, although this fixing method can effectively prevent the control counter from tipping over under extreme conditions, it also brings significant limitations. The first is that the installation and disassembly caused by multiple sets of bolts seriously affect the flexibility of the mobile control counter. In addition, the bolts are easily loosened on a constantly shaking platform, resulting in the control counter being installed loosely. Summary of the invention

[0004] The purpose of the present invention is to provide a mobile control counter fixing device to solve the problem that the current traditional control counter fixing device will affect the flexibility of the mobile control counter and the bolt fixing is easy to loosen.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mobile control counter fixing device, comprising a control cabinet, a bottom sealing groove is provided at the bottom of the control cabinet, universal wheels are provided at the four corners of the bottom sealing groove, a spring telescopic rod is fixedly connected above the universal wheel, the upper end of the spring telescopic rod is fixedly connected to the bottom of the control cabinet, a fixing bolt passes through the top of the bottom sealing groove, the fixing bolt is threadedly connected to a fastening connector, and the fastening connector is fixedly installed on the ground;

[0006] A pendulum drive mechanism is arranged in the bottom sealing groove, and the pendulum drive mechanism comprises a fixing frame, the fixing frame is fixedly installed in the bottom sealing groove, a metal pendulum is rotatably connected to the fixing frame, the metal pendulum is penetrated by the left shaft and the right shaft, the metal pendulum is unidirectionally connected to the left shaft and the right shaft respectively through a ratchet, and the right shaft at the rightmost end is movably connected to the driving shaft;

[0007] A piston cylinder is provided in the bottom sealing groove, a reciprocating screw rod passes through the piston cylinder, a small pulley is fixedly connected to one end of the driving shaft, a large pulley is fixedly connected to one end of the reciprocating screw rod, the small pulley and the large pulley are connected by a synchronous belt transmission, a one-way fastening sleeve is provided on the outer sleeve of the fixing bolt, the one-way fastening sleeve is connected to the fixing bolt in one-way transmission through a ratchet, a first bevel gear is fixedly connected to the outer side of the one-way fastening sleeve, and a second bevel gear is fixedly connected to one end of the reciprocating screw rod, and the first bevel gear and the second bevel gear are meshed with each other.

[0008] Furthermore, a rubber sealing ring is embedded around the bottom sealing groove, and a sealing gasket is also arranged around the fixing bolt.

[0009] Furthermore, there are two groups of fixing frames, and each group of fixing frames is provided with five metal pendulums, and a group of left shafts and right shafts are provided at the left and right ends of the rotating shaft of each metal pendulum.

[0010] Furthermore, a first ratchet is provided on the left side of the rotating shaft of the metal pendulum, a second ratchet is provided on the left shaft, the first ratchet and the second ratchet are engaged with each other, a first spring is provided on the outer sleeve of the left shaft, and the first spring pushes the left shaft to the right.

[0011] Furthermore, a third ratchet is provided on the right side of the rotating shaft of the metal pendulum, and a fourth ratchet is provided on the right shaft. The third ratchet and the fourth ratchet are engaged with each other. A second spring is provided on the outer sleeve of the right shaft. The second spring pushes the right shaft to the left, and the left shaft and the right shaft are connected end to end in sequence.

[0012] Furthermore, the adjacent left shaft and right shaft are plugged into each other via a hexagonal pin, and the right shaft at the rightmost end is also plugged into a driving shaft via a hexagonal pin.

[0013] Furthermore, the metal pendulum is made of cast iron, and a thickened counterweight is provided at the lower end.

[0014] Furthermore, a pumping piston is provided in the piston cylinder, and the pumping piston is transmission-connected to the reciprocating screw rod. An air suction port is provided at the lower left side of the piston cylinder, and an exhaust port is provided at the upper left side of the piston cylinder, and the exhaust port is connected to the outer side of the top of the bottom sealing groove.

[0015] Furthermore, a first one-way valve is disposed in the air suction port, and a second one-way valve is disposed in the air exhaust port. The first one-way valve opens inwards, and the second one-way valve opens outwards.

[0016] Furthermore, a fifth ratchet is provided at the upper end of the one-way fastening sleeve, a sixth ratchet is provided on the outer side of the fixing bolt, the fifth ratchet and the sixth ratchet are engaged with each other, and a pressure spring is provided under the one-way fastening sleeve, and the pressure spring pushes the one-way fastening sleeve upward.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a fixing device for a mobile control counter. By setting a universal wheel with a spring telescopic rod, the mobile control counter can be moved freely to increase flexibility. When the fixing bolts and the fastening connectors are fixedly connected, the universal wheel can also be retracted into the bottom sealing groove without affecting the fixed installation of the control counter.

[0019] 2. The present invention provides a mobile control counter fixing device, which drives the one-way fastening sleeve to rotate unidirectionally through a pendulum driving mechanism and a series of transmission mechanisms, and then drives the fixing bolt to rotate unidirectionally. In this way, when encountering a large amplitude shaking, the metal pendulum in the pendulum driving mechanism will swing accordingly, and transmit the rotational torque unidirectionally through the ratchet wheel, and amplify the torque through the pulley and gear to act on the fixing bolt, so that the fixing bolt is locked. This not only prevents the loosening of the fixing bolt due to shaking, but also continuously provides pre-tightening force to increase the tightness of the fixing bolt.

[0020] 3. The present invention provides a fixing device for a mobile control counter, which drives the reciprocating screw to rotate through a pendulum driving mechanism, thereby driving the pump air piston to move back and forth, and cooperates with the one-way valves at the air suction port and the air exhaust port, so that the air in the bottom sealing groove can be continuously pumped out to the outside, thereby forming a vacuum in the bottom sealing groove. In this way, the bottom sealing groove becomes a suction cup, which firmly adsorbs and fixes the mobile control counter to the ground, thereby increasing the stability. In addition, it can also reduce the oxygen content in the bottom sealing groove, reduce the rust rate of the fixing bolts and other metal parts in harsh environments, and ensure the life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the control cabinet structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the bottom sealing groove structure of the present invention;

[0023] Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the bottom sealing groove of the present invention;

[0025] Figure 5 For the present invention Figure 4 The enlarged structural diagram at B in the middle;

[0026] Figure 6 For the present invention Figure 4 The enlarged structural diagram at C in the middle;

[0027] Figure 7 It is a schematic diagram of the structure of the pendulum driving mechanism of the present invention;

[0028] Figure 8 It is a schematic cross-sectional view of the pendulum driving mechanism of the present invention;

[0029] Fig. 9 It is a schematic diagram of the structure of the metal pendulum, the left shaft and the right shaft of the present invention;

[0030] Fig.10 This is a schematic diagram of the fixing bolt structure of the present invention;

[0031] Fig.11 It is a schematic diagram of the cross-sectional structure of the piston cylinder of the present invention.

[0032] Numbers in the figure: 1, control cabinet; 2, bottom sealing groove; 201, rubber sealing ring; 3, universal wheel; 4, spring telescopic rod; 5, fixing bolt; 501, sealing gasket; 502, sixth ratchet; 6, fastening connector; 7, pendulum driving mechanism; 701, fixing frame; 702, metal pendulum; 703, left shaft; 704, right shaft; 705, first ratchet; 706, second ratchet; 707, first spring; 708, third ratchet; 709, fourth ratchet; 710, second spring; 711, hexagonal pin; 712, drive shaft; 8, piston cylinder; 9, reciprocating screw; 10, pump piston; 11, air suction port; 12, first one-way valve; 13, exhaust port; 14, second one-way valve; 15, small pulley; 16, large pulley; 17, synchronous belt; 18, one-way fastening sleeve; 1801, fifth ratchet; 19, first bevel gear; 20, second bevel gear; 21, pressure spring. DETAILED DESCRIPTION

[0033] 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.

[0034] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0035] Combination Figure 1 - Fig.11, a mobile control counter fixing device comprises a control cabinet 1, a bottom sealing groove 2 is arranged at the bottom of the control cabinet 1, and universal wheels 3 are arranged at the four corners of the bottom sealing groove 2. A spring telescopic rod 4 is fixedly connected above the universal wheel 3, and the upper end of the spring telescopic rod is fixedly connected to the bottom of the control cabinet 1. A fixing bolt 5 passes through the top of the bottom sealing groove 2, and the fixing bolt 5 is threadedly connected to a fastening connector 6, and the fastening connector 6 is fixedly installed on the ground. In this way, in an unfixed state, the spring telescopic rod 4 pushes the universal wheel 3 downward out of the bottom sealing groove 2, so that the entire control cabinet 1 can be supported and moved. When fixedly installed, the fastening connector 6 must first be fixedly installed on the ground, and then the control cabinet 1 is pushed above the fastening connector 6, and the fixing bolt 5 is rotated so that the fixing bolt 5 and the fastening connector 6 are fixedly locked by threads. At the same time, as the fixing bolt 5 is locked, the control cabinet 1 is also pulled downward, the spring telescopic rod 4 is compressed, and the universal wheel 3 retracts into the bottom sealing groove 2.

[0036] A pendulum drive mechanism 7 is arranged in the bottom sealing groove 2. The pendulum drive mechanism 7 includes a fixing frame 701. The fixing frame 701 is fixedly installed in the bottom sealing groove 2. A metal pendulum 702 is rotatably connected to the fixing frame 701. The metal pendulum 702 is made of cast iron and has a thickened counterweight at the lower end. The metal pendulum 702 is penetrated by a left shaft 703 and a right shaft 704. The metal pendulum 702 is connected to the left shaft 703 and the right shaft 704 in a one-way transmission manner through a ratchet. There are two groups of fixed frames 701, and each group of fixed frames 701 is provided with five metal pendulums 702, and a group of left-side shafts 703 and right-side shafts 704 are provided at the left and right ends of the rotating shaft of each metal pendulum 702, a first ratchet 705 is provided on the left side of the rotating shaft of the metal pendulum 702, a second ratchet 706 is provided on the left shaft 703, the first ratchet 705 and the second ratchet 706 are engaged with each other, a first spring 707 is provided on the outer sleeve of the left shaft 703, the first spring 707 pushes the left shaft 703 to the right, a third ratchet 708 is provided on the right side of the rotating shaft of the metal pendulum 702, a fourth ratchet 709 is provided on the right shaft 704, the third ratchet 708 and the fourth ratchet 709 are engaged with each other, and the right shaft 70 The outer sleeve is provided with a second spring 710, which pushes the right shaft 704 to the left, and the left shaft 703 and the right shaft 704 are connected end to end in sequence. The adjacent left shaft 703 and the right shaft 704 are plugged into each other through a hexagonal pin 711, and the right shaft 704 at the rightmost end is also plugged with a driving shaft 712 through the hexagonal pin 711. In this way, when the metal pendulum 702 in the pendulum driving mechanism 7 is shaken, and because the metal pendulum 702 is in contact with the left shaft 703 and the right shaft 704 through the ratchet, the metal pendulum 702 will drive the left shaft 703 and the right shaft 704 to rotate in one direction when swinging, and then drive the driving shaft 712 to rotate in one direction, and then drive the reciprocating screw rod 9 to rotate through the pulley transmission.

[0037] A piston cylinder 8 is arranged in the bottom sealing groove 2, a reciprocating screw 9 runs through the piston cylinder 8, a pumping piston 10 is arranged in the piston cylinder 8, the pumping piston 10 is transmission-connected with the reciprocating screw 9, a suction port 11 is arranged at the lower left side of the piston cylinder 8, an exhaust port 13 is arranged at the upper left side of the piston cylinder 8, the exhaust port 13 is connected to the outer side of the top of the bottom sealing groove 2, a first one-way valve 12 is arranged in the suction port 11, a second one-way valve 14 is arranged in the exhaust port 13, the opening direction of the first one-way valve 12 faces inward, and the opening direction of the second one-way valve 14 faces outward. When the pendulum driving mechanism 7 drives the reciprocating screw 9 to rotate, it will drive the pumping piston 10 to reciprocate in the piston cylinder 8. When the pumping piston 10 moves to the right, the first one-way valve 12 opens, and the second one-way valve 14 opens. 14 is closed, so that the air in the bottom sealing groove 2 can be sucked into the piston cylinder 8. When the pump piston 10 moves to the left, the first one-way valve 12 is closed and the second one-way valve 14 is opened, so that the air in the piston cylinder 8 can be discharged outward through the exhaust port 13. In this way, the air in the bottom sealing groove 2 can be discharged reciprocatingly, so that a certain vacuum state is formed in the bottom sealing groove 2. The rubber sealing ring 201 around the bottom sealing groove 2 and the sealing gasket 501 at the fixing bolt 5 all play a role in strengthening the seal. In this way, the bottom sealing groove 2 forms a suction cup, which firmly adsorbs the control cabinet 1 to the ground, and can also reduce the oxygen content in the bottom sealing groove 2 and reduce metal rust, especially on ships, which can effectively reduce the corrosion of seawater.

[0038] One end of the driving shaft 712 is fixedly connected to a small pulley 15, one end of the reciprocating screw rod 9 is fixedly connected to a large pulley 16, the small pulley 15 and the large pulley 16 are connected by a synchronous belt 17, a one-way fastening sleeve 18 is provided on the outer sleeve of the fixing bolt 5, the one-way fastening sleeve 18 is connected to the fixing bolt 5 in one-way transmission through a ratchet, a first bevel gear 19 is fixedly connected to the outer side of the one-way fastening sleeve 18, one end of the reciprocating screw rod 9 is fixedly connected to a second bevel gear 20, the first bevel gear 19 and the second bevel gear 20 are meshed with each other, and a fifth ratchet 18 is provided on the upper end of the one-way fastening sleeve 18 01. A sixth ratchet 502 is arranged on the outside of the fixing bolt 5. The fifth ratchet 1801 and the sixth ratchet 502 are interlocked with each other. A pressure spring 21 is arranged under the one-way fastening sleeve 18. The pressure spring 21 pushes the one-way fastening sleeve 18 upward. When the reciprocating screw 9 rotates, it will drive the second bevel gear 20 to rotate. The second bevel gear 20 drives the first bevel gear 19 to rotate, and then drives the one-way fastening sleeve 18 to rotate. Since the one-way fastening sleeve 18 is connected to the fixing bolt 5 through the ratchet, the one-way fastening sleeve 18 will also drive the fixing bolt 5 to rotate unidirectionally and lock it.

[0039] Specifically, rubber sealing rings 201 are embedded around the bottom sealing groove 2, and sealing gaskets 501 are also arranged around the fixing bolts 5, which can effectively ensure the sealing effect of the bottom sealing groove 2, maintain the vacuum degree, increase the firmness, and prevent the moving parts from rusting quickly under harsh conditions such as seawater.

[0040] Working principle: First, in the unfixed state, the spring telescopic rod 4 pushes the universal wheel 3 downward out of the bottom sealing groove 2, so that the entire control cabinet 1 can be supported and moved easily. When fixedly installed, the fastening connector 6 must first be fixed on the ground, and then the control cabinet 1 must be pushed above the fastening connector 6, and the fixing bolt 5 must be turned so that the fixing bolt 5 and the fastening connector 6 are fixed and locked by threads. At the same time, as the fixing bolt 5 is locked, the control cabinet 1 is also pulled downward, the spring telescopic rod 4 is compressed, and the universal wheel 3 is retracted into the bottom sealing groove 2, so that the rubber sealing ring 201 around the bottom sealing groove 2 contacts the ground and is pressed and sealed.

[0041] In this way, when encountering shaking, the metal pendulum 702 in the pendulum driving mechanism 7 will swing along with it. Since the metal pendulum 702 contacts the left shaft 703 and the right shaft 704 respectively through the ratchet, the metal pendulum 702 will drive the left shaft 703 and the right shaft 704 to rotate unidirectionally when it swings, thereby driving the driving shaft 712 to rotate unidirectionally, and then drive the reciprocating screw rod 9 to rotate through the pulley transmission, thereby driving the second bevel gear 20 to rotate, and the second bevel gear 20 drives the first bevel gear 19 to rotate, thereby driving the one-way fastening sleeve 18 to rotate. Since the one-way fastening sleeve 18 is connected to the fixing bolt 5 through the ratchet, the one-way fastening sleeve 18 will also drive the fixing bolt 5 to rotate unidirectionally and lock.

[0042] Since the transmission ratio of the small pulley 15 and the large pulley 16 is 1:4, and the transmission ratio of the second bevel gear 20 and the first bevel gear 19 is also 1:4, the torque from the metal pendulum 702 to the fixing bolt 5 is amplified sixteen times in total. With a total of ten metal pendulums 702, the fixing bolt 5 can be effectively locked.

[0043] When the pendulum drive mechanism 7 drives the reciprocating screw rod 9 to rotate, it also drives the pump air piston 10 to reciprocate in the piston cylinder 8. When the pump air piston 10 moves to the right, the first one-way valve 12 opens and the second one-way valve 14 closes, so that the air in the bottom sealing groove 2 can be sucked into the piston cylinder 8. When the pump air piston 10 moves to the left, the first one-way valve 12 closes and the second one-way valve 14 opens, so that the air in the piston cylinder 8 can be discharged outward through the exhaust port 13. In this way, the air in the bottom sealing groove 2 can be discharged reciprocatingly, so that a certain vacuum state is formed in the bottom sealing groove 2. The rubber sealing ring 201 around the bottom sealing groove 2 and the sealing gasket 501 at the fixing bolt 5 all play a role in strengthening the seal. In this way, the bottom sealing groove 2 forms a suction cup, which firmly adsorbs the control cabinet 1 to the ground, and can also reduce the oxygen content in the bottom sealing groove 2 and reduce the rust of the metal, especially on ships, which can effectively reduce the corrosion of seawater.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mobile control counter fixing device, comprising a control cabinet (1), characterized in that: The control cabinet (1) is provided with a bottom sealing groove (2) at the bottom, and universal wheels (3) are provided at the four corners of the bottom sealing groove (2). A spring telescopic rod (4) is fixedly connected above the universal wheel (3), and the upper end of the spring telescopic rod is fixedly connected to the bottom of the control cabinet (1). A fixing bolt (5) passes through the top of the bottom sealing groove (2), and the fixing bolt (5) is threadedly connected to a fastening connector (6), and the fastening connector (6) is fixedly installed on the ground; A pendulum drive mechanism (7) is arranged in the bottom sealing groove (2), and the pendulum drive mechanism (7) comprises a fixing frame (701), the fixing frame (701) is fixedly mounted in the bottom sealing groove (2), a metal pendulum (702) is rotatably connected to the fixing frame (701), the metal pendulum (702) is penetrated by a left shaft (703) and a right shaft (704), the metal pendulum (702) is unidirectionally connected to the left shaft (703) and the right shaft (704) via ratchets, and the right shaft (704) at the rightmost end is movably connected to a drive shaft (712); A piston cylinder (8) is arranged in the bottom sealing groove (2), a reciprocating screw rod (9) passes through the piston cylinder (8), one end of the driving shaft (712) is fixedly connected to a small pulley (15), one end of the reciprocating screw rod (9) is fixedly connected to a large pulley (16), the small pulley (15) and the large pulley (16) are connected in transmission via a synchronous belt (17), a one-way fastening sleeve (18) is provided on the outer sleeve of the fixing bolt (5), the one-way fastening sleeve (18) is connected in one-way transmission with the fixing bolt (5) via a ratchet, a first bevel gear (19) is fixedly connected to the outer side of the one-way fastening sleeve (18), one end of the reciprocating screw rod (9) is fixedly connected to a second bevel gear (20), and the first bevel gear (19) and the second bevel gear (20) are meshed with each other.

2. A mobile control counter fixing device according to claim 1, characterized in that: A rubber sealing ring (201) is embedded around the bottom sealing groove (2), and a sealing gasket (501) is also arranged around the fixing bolt (5).

3. The mobile control counter fixing device according to claim 1 is characterized in that: There are two groups of fixed frames (701) in total, and each group of fixed frames (701) is provided with five metal pendulums (702), and a group of left shafts (703) and right shafts (704) are provided at the left and right ends of the rotation axis of each metal pendulum (702).

4. The mobile control counter fixing device according to claim 1 is characterized in that: A first ratchet (705) is arranged on the left side of the rotating shaft of the metal pendulum (702), a second ratchet (706) is arranged on the left side shaft (703), the first ratchet (705) and the second ratchet (706) are engaged with each other, and a first spring (707) is arranged on the outer sleeve of the left side shaft (703), and the first spring (707) pushes the left side shaft (703) to the right.

5. The mobile control counter fixing device according to claim 1 is characterized in that: A third ratchet (708) is arranged on the right side of the rotating shaft of the metal pendulum (702), a fourth ratchet (709) is arranged on the right side shaft (704), the third ratchet (708) and the fourth ratchet (709) are interlocked, a second spring (710) is arranged on the outer sleeve of the right side shaft (704), the second spring (710) pushes the right side shaft (704) to the left, and the left side shaft (703) and the right side shaft (704) are connected end to end in sequence.

6. The mobile control counter fixing device according to claim 1, characterized in that: The adjacent left shafts (703) and right shafts (704) are plugged into each other via a hexagonal pin (711), and the right shaft (704) at the rightmost end is also plugged into a driving shaft (712) via the hexagonal pin (711).

7. The mobile control counter fixing device according to claim 1 is characterized in that: The metal pendulum (702) is made of cast iron, and a thickened counterweight is provided at the lower end.

8. The mobile control counter fixing device according to claim 7 is characterized in that: A pumping piston (10) is arranged in the piston cylinder (8), and the pumping piston (10) is drivingly connected to the reciprocating screw (9). A suction port (11) is arranged at the lower left side of the piston cylinder (8), and an exhaust port (13) is arranged at the upper left side of the piston cylinder (8). The exhaust port (13) is connected to the outer side of the top of the bottom sealing groove (2).

9. The mobile control counter fixing device according to claim 8, characterized in that: A first one-way valve (12) is arranged in the air suction port (11), and a second one-way valve (14) is arranged in the air exhaust port (13); the first one-way valve (12) opens inwards, and the second one-way valve (14) opens outwards.

10. The mobile control counter fixing device according to claim 1, characterized in that: A fifth ratchet (1801) is arranged at the upper end of the one-way fastening sleeve (18), a sixth ratchet (502) is arranged on the outer side of the fixing bolt (5), the fifth ratchet (1801) and the sixth ratchet (502) are engaged with each other, and a pressure spring (21) is arranged below the one-way fastening sleeve (18), the pressure spring (21) pushes the one-way fastening sleeve (18) upwards.

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