Lifting hook pulley anti-swing device for maritime work crane
By using a combination device of cable lock blocks and pins on the hook pulley of the offshore crane, the problem of irregular swing of the hook pulley in the non-working state is solved, the effective limit on the swing is achieved, and the safety of the equipment is improved.
Patent Information
- Application Number
- CN202422055604.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In the non-working state of the offshore crane, the hook pulley swings irregularly due to factors such as waves and wind, which can easily cause damage to the wire rope to jump out of the pulley rope groove, collision with the hook and the boom structure, and entanglement of the wire rope, seriously affecting the safety of lifting operations.
The cable lock block and latch are used to limit the lateral swing of the hook pulley through the cable lock block to ensure that the swing range of the hook pulley is limited in the non-working state, avoid damage, and improve safety.
It effectively limits the swing amplitude of the hook pulley in the non-working state, avoids equipment damage and safety risks, and improves the safety of lifting operations.
Smart Images
Figure CN223016321U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of offshore cranes, and particularly relates to an anti-sway device for a hook pulley of an offshore crane. Background Art
[0002] During the use of marine and offshore cranes, affected by factors such as waves and wind, the hook in the non-working state (i.e., the empty hook state) will swing irregularly with a large amplitude, which easily leads to phenomena such as the wire rope jumping out of the pulley groove and being damaged, the hook colliding with the boom structure and causing structural damage, and the wire ropes of other hanging hooks being entangled with each other and causing damage to the wire ropes. This will seriously affect the safety of the lifting operation. Therefore, how to limit the swing amplitude of the hook in the non-working state and improve the safety of the lifting operation has become a difficult problem that needs to be solved urgently at present. Summary of the Invention
[0003] The technical problem to be solved by the utility model is to provide an anti-sway device for a hook pulley of an offshore crane. By the combined use of a cable lock block and a pin, it is convenient to limit the lateral swing of the hook pulley through the cable lock block, thereby limiting the swing amplitude of the hook pulley in the non-working state, avoiding its damage, and ensuring safety.
[0004] To solve the above technical problem, the utility model adopts the following technical solutions: An anti-sway device for a hook pulley of an offshore crane of the utility model includes a boom, a fixing plate, a pulley, a fixed pulley shaft, and a hook pulley; the boom is horizontally and longitudinally arranged, and two vertically and longitudinally arranged fixing plates are symmetrically arranged at intervals on the left and right sides of its lower surface, and a fixed pulley shaft is horizontally and transversely arranged at the middle position between every two adjacent fixing plates; several pulleys are coaxially sleeved on the two fixed pulley shafts at intervals along their lengths, and the hook pulley is connected to the pulley through a wire rope to perform a lifting operation; the innovation lies in: it also includes a mounting plate, a cable lock block, a pin, and a guiding cone; mounting plates are coaxially sleeved at both ends of the two fixed pulley shafts respectively, each mounting plate is rotatably connected to the corresponding fixed pulley shaft through a bearing, and all the pulleys on the corresponding fixed pulley shaft are covered by every two adjacent mounting plates, and it is ensured that there is no interference with the movement of the pulley; cable lock blocks are vertically fixed on the lower surfaces of every two adjacent mounting plates respectively, and each cable lock block is a hollow cuboid structure that is open at the top and bottom and does not interfere with the movement of the pulley; pins that match the interiors of the corresponding cable lock blocks are vertically screwed on the upper surface of the hook pulley at positions corresponding to the two cable lock blocks, and by lifting the hook pulley upward, the two pins are respectively inserted into the corresponding cable lock blocks to limit the lateral swing of the hook pulley.
[0005] Preferably, the upper surface of each cable locking block is respectively and fixedly connected in a fitting manner with the lower surfaces of the corresponding two mounting plates, and the size of its internal space needs to ensure that the steel wire rope on the pulley extends out through the lower end surface of the corresponding cable locking block and is connected to the hook pulley, without affecting the action of the steel wire rope in pulling the hook pulley.
[0006] Preferably, the size of each pin and its position fixed on the hook pulley need to ensure that the pins are arranged at intervals inside relative to the steel wire rope, without affecting the action of the steel wire rope in pulling the hook pulley.
[0007] Preferably, a limiting plate is horizontally and fixedly arranged at a position near the lower surface inside each cable locking block, and a limiting hole matching the pin is vertically inserted and penetrated through the upper surface of each limiting plate at a position corresponding to each pin, so as to limit the action of the pin inserted into the corresponding cable locking block through the limiting hole and ensure that the pin does not collide with the inside of the corresponding cable locking block.
[0008] Preferably, several reinforcing plates are vertically arranged at intervals along the circumferential direction between the lower surface of each limiting plate and the inner wall of the corresponding cable locking block, and each reinforcing plate does not extend to the coverage range of the corresponding limiting hole, and the corresponding limiting plate is fixed and strengthened through the reinforcing plate.
[0009] Preferably, a guiding cone is vertically and aligned and fixedly arranged at the end surface of the insertion end of each pin. The lower surface of each guiding cone is the large-diameter end with the same cross-sectional area as the corresponding pin, and its upper surface is the small-diameter end, so as to guide the action of the pin inserted into the corresponding cable locking block through the guiding cone.
[0010] Preferably, it further includes a centering sensor; a centering sensor is horizontally arranged on the right inner wall of the leftmost cable locking block. The sensing end of the centering sensor is horizontally arranged towards the center of the corresponding cable locking block, and its installation position needs to ensure that when the centering sensor senses the pin, the upper half of the pin is inserted into the corresponding cable locking block through the limiting hole, and it needs to ensure that when the pin is inserted into the corresponding cable locking block, it does not collide with the centering sensor.
[0011] Preferably, a lower limit sensor is horizontally arranged on the right inner wall of the leftmost cable locking block directly below the centering sensor, and the sensing end of the lower limit sensor is horizontally arranged towards the center of the corresponding cable locking block, and the lower limit sensor is used in cooperation with the pin to monitor whether the pin is separated from the corresponding cable locking block; an upper limit sensor is horizontally arranged on the right inner wall of the leftmost cable locking block directly above the centering sensor, and the sensing end of the upper limit sensor is horizontally arranged towards the center of the corresponding cable locking block, and the upper limit sensor is used in cooperation with the pin to perform an upper limit on the upward lifting of the hook pulley, so as to ensure that the pin does not collide with the pulley under the boom.
[0012] Preferably, it further includes an electric push rod, an insertion block and a reinforcing rod; a jack is vertically and embeddedly provided on the outer side of each pin near its upper end, and the jack on the left side is arranged on the opposite side of the corresponding centering sensor. Each jack is conical, and the end near the center of the corresponding pin is the small-diameter end; an electric push rod is horizontally and transversely provided on the outer side of each cable lock block near its lower end, and the position of each electric push rod corresponds to the position of the jack when the centering sensor senses the pin; the pushing end of each electric push rod vertically extends into the corresponding cable lock block, and is fixedly connected to the corresponding insertion block by a flange plate and pushes the insertion block to reciprocate horizontally in the corresponding cable lock block; each insertion block matches the small-diameter end part of the corresponding jack, and under the push of the electric push rod, the insertion block is inserted into the corresponding jack, and during this process, the insertion action of the corresponding insertion block is guided by the large-diameter end of the jack, and then through the plug-in cooperation of the insertion block and the insertion block, the stability of the plug-in state of the pin and the cable lock block is ensured.
[0013] Preferably, when the pushing end of each electric push rod retracts to the limit position, it is necessary to ensure that the insertion block is not within the coverage range of the corresponding limit hole, so as to ensure that when the pin is inserted into the corresponding cable lock block, it does not collide with the corresponding insertion block; a reinforcing rod is obliquely and fixedly provided between the tail of each electric push rod and the outer side of the corresponding cable lock block, and the corresponding electric push rod is fixed and strengthened through the reinforcing rod.
[0014] The beneficial effects of the utility model are as follows:
[0015] (1) By the combined use of the cable lock block and the pin, the utility model is convenient to limit the lateral swing of the hook pulley through the cable lock block, so as to limit the swing amplitude of the hook pulley in the non-working state, avoid its damage, and ensure safety;
[0016] (2) By the combined use of the electric push rod, the insertion block and the jack, the utility model is convenient to position the upper and lower positions of the pin when the pin is inserted into the cable lock block, so as to ensure the stability of the plug-in state of the pin and the cable lock block;
[0017] (3) By setting the upper limit sensor and the lower limit sensor, the utility model can not only ensure that the pin does not collide with the pulley under the boom, but also avoid the pin from detaching from the cable lock block;
[0018] (4) By setting the guiding cone, the utility model is convenient to guide the action of inserting the pin into the cable lock block;
[0019] (5) By setting the limit plate, the utility model is convenient to limit the action of inserting the pin into the cable lock block, so as to avoid the pin from colliding with the insertion block, the upper limit sensor, the centering sensor or the lower limit sensor. Description of the Drawings
[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 It is a schematic structural diagram of an anti-sway device for a hook pulley of an offshore crane according to the present invention.
[0022] Figure 2 For Figure 1 An enlarged schematic diagram of the cable lock block part.
[0023] Figure 3 It is a schematic structural diagram when the cable lock block and the pin of the present invention are locked.
[0024] Figure 4 For Figure 3 An enlarged schematic diagram of the cable lock block part.
[0025] Wherein, 1 - boom; 2 - mounting plate; 3 - cable lock block; 4 - hook pulley; 5 - pin; 6 - guiding cone; 7 - limiting plate; 8 - limiting hole; 9 - reinforcing plate; 10 - fixed pulley shaft; 11 - fixing plate; 12 - jacking hole; 13 - electric push rod; 14 - reinforcing rod; 15 - inserting block; 16 - upper limit sensor; 17 - centering sensor; 18 - lower limit sensor. Specific embodiments
[0026] The following will clearly and completely describe the technical solutions of the present invention through specific embodiments.
[0027] An anti-sway device for a hook pulley of an offshore crane according to the present invention includes a boom 1, a fixing plate 11, a pulley, a fixed pulley shaft 10, a hook pulley 4, a mounting plate 2, a cable lock block 3, a pin 5 and a guiding cone 6; the specific structure is as Figures 1 - 4 shown. The boom 1 is horizontally and longitudinally arranged, and two vertically and longitudinally arranged fixing plates 11 are respectively symmetrically arranged at intervals on the left and right sides of its lower surface, and a fixed pulley shaft 10 is horizontally and transversely arranged at the middle position between every two adjacent fixing plates 11; several pulleys are respectively coaxially sleeved on the two fixed pulley shafts 10 at intervals along their lengths, and the hook pulley 4 is connected to the pulley through a steel wire rope to perform lifting operations; this part is prior art and is similar to a conventional crane, so it will not be described in detail here.
[0028] On the two fixed pulley shafts 10 of the present invention, mounting plates 2 are respectively coaxially sleeved at both ends thereof, as Figures 1 - 4As shown in the figure, each mounting plate 2 is rotatably connected to the corresponding fixed pulley shaft 10 through a bearing, and all the pulleys on the corresponding fixed pulley shaft 10 are covered by every two adjacent mounting plates 2, ensuring no interference with the movement of the pulleys; on the lower surfaces of every two adjacent mounting plates 2, cable lock blocks 3 are respectively vertically fixed, and each cable lock block 3 is a hollow rectangular parallelepiped structure that is open at the top and bottom, without interfering with the movement of the pulleys; among them, the upper surfaces of each cable lock block 3 are respectively fixedly connected to the lower surfaces of the corresponding two mounting plates 2 in a fitting manner, and the internal space size thereof needs to ensure that the steel wire rope on the pulley extends out from the lower end surface of the corresponding cable lock block 3 to be connected to the hook pulley 4, without affecting the action of the steel wire rope in pulling the hook pulley 4.
[0029] In the utility model, on the upper surface of the hook pulley 4, bolts 5 that match the interiors of the corresponding cable lock blocks 3 are respectively vertically screwed at positions corresponding to the two cable lock blocks 3, and by lifting the hook pulley 4 upward, the two bolts 5 are respectively inserted into the corresponding cable lock blocks 3, thereby limiting the lateral swing of the hook pulley 4; as Figures 1 - 4 shown in the figure, the size of each bolt 5 and its position fixed on the hook pulley 4 need to ensure that the bolts 5 are arranged at intervals on the inner side relative to the steel wire rope, without affecting the action of the steel wire rope in pulling the hook pulley 4; at a position near the lower surface inside each cable lock block 3, a limiting plate 7 is horizontally fixed, and at a position on the upper surface of each limiting plate 7 corresponding to each bolt 5, a limiting hole 8 that matches the bolt 5 is respectively vertically embedded and penetrated, thereby limiting the action of the bolt 5 inserted into the corresponding cable lock block 3 through the limiting hole 8, and ensuring that the bolt 5 does not collide with the interior of the corresponding cable lock block 3.
[0030] As Figures 1 - 4 shown in the figure, between the lower surface of each limiting plate 7 and the inner wall of the corresponding cable lock block 3, several reinforcing plates 9 are evenly spaced and vertically arranged in the circumferential direction, and each reinforcing plate 9 does not extend to the coverage range of the corresponding limiting hole 8, and the corresponding limiting plate 7 is fixed and strengthened through the reinforcing plate 9.
[0031] As Figures 1 - 4 shown in the figure, on the end face of the insertion end of each bolt 5, a guiding cone 6 is respectively vertically and aligned and fixed, the lower surface of each guiding cone 6 is the large-diameter end that is consistent with the cross-sectional area of the corresponding bolt 5, and its upper surface is the small-diameter end, thereby guiding the action of the bolt 5 inserted into the corresponding cable lock block 3 through the guiding cone 6.
[0032] In the utility model, a centering sensor 17 is also horizontally arranged on the right inner wall of the left cable lock block 3, as Figures 1 - 4As shown in the figure, the sensing end of the centering sensor 17 is horizontally arranged towards the center of the corresponding cable lock block 3, and its installation position needs to ensure that when the centering sensor 17 senses the bolt 5, the upper half of the bolt 5 is inserted into the corresponding cable lock block 3 through the limit hole 8, and it is necessary to ensure that when the bolt 5 is inserted into the corresponding cable lock block 3, it does not collide with the centering sensor 17; on the right inner wall of the left cable lock block 3, a lower limit sensor 18 is also horizontally arranged directly below the centering sensor 17, and the sensing end of the lower limit sensor 18 is horizontally arranged towards the center of the corresponding cable lock block 3, and through the sensing cooperation between the lower limit sensor 18 and the bolt 5, it is monitored whether the bolt 5 is separated from the corresponding cable lock block 3; on the right inner wall of the left cable lock block 3, an upper limit sensor 16 is also horizontally arranged directly above the centering sensor 17, and the sensing end of the upper limit sensor 16 is horizontally arranged towards the center of the corresponding cable lock block 3, and through the sensing cooperation between the upper limit sensor 16 and the bolt 5, the upward lifting of the hook pulley 4 is limited, so as to ensure that the bolt 5 does not collide with the pulley under the boom 1.
[0033] In the present utility model, a jack 12 is vertically and embeddedly opened at the upper end position on the outer side of each bolt 5, and the left jack 12 is arranged on the opposite side of the corresponding centering sensor 17, as Figures 1 - 4 shown, each jack 12 is conical, and the end close to the center of the corresponding bolt 5 is the small-diameter end; on the outer side of each cable lock block 3, a horizontal electric push rod 13 is also horizontally arranged at the lower end position, and the installation position of each electric push rod 13 corresponds to the position of the jack 12 when the centering sensor 17 senses the bolt 5; the pushing end of each electric push rod 13 vertically extends into the corresponding cable lock block 3, and is fixedly connected to the corresponding plug 15 by a flange plate and pushes the plug 15 to perform horizontal reciprocating motion inside the corresponding cable lock block 3; each plug 15 matches the small-diameter end part of the corresponding jack 12, and under the push of the electric push rod 13, the plug 15 is inserted into the corresponding jack 12, and during this process, the insertion action of the corresponding plug 15 is guided by the large-diameter end of the jack 12, and thus, through the plug-in cooperation between the plug 15 and the plug 15, the stability of the plug-in state of the bolt 5 and the cable lock block 3 is ensured.
[0034] As Figures 1 - 4 shown, the retraction limit position of the pushing end of each electric push rod 13 needs to ensure that the plug 15 is not within the coverage range of the corresponding limit hole 8, so as to ensure that when the bolt 5 is inserted into the corresponding cable lock block 3, it does not collide with the corresponding plug 15; between the tail of each electric push rod 13 and the outer side of the corresponding cable lock block 3, a reinforcing rod 14 is also obliquely fixed, and the corresponding electric push rod 13 is fixed and strengthened through the reinforcing rod 14.
[0035] Working principle of the utility model: When the hook pulley 4 is in a non-working state, the hook pulley 4 is lifted upward by a steel wire rope, so that the pin 5 is inserted into the corresponding cable locking block 3 through the limit hole 8, and the guide cone 6 is used for guiding during this process; when the centering sensor 17 senses the pin 5, the hook pulley 4 stops moving. At this time, under the push of the electric push rod 13, the insertion block 15 is inserted into the insertion hole 12 of the corresponding pin 5 to ensure the stability of the insertion state of the pin 5 and the cable locking block 3, thereby limiting the lateral swing of the hook pulley 4 through the cable locking block 3.
[0036] Advantages of the utility model:
[0037] (1) By the combined use of the cable locking block 3 and the pin 5 in the utility model, it is convenient to limit the lateral swing of the hook pulley 4 through the cable locking block 3, so as to limit the swing amplitude of the hook pulley 4 in the non-working state, avoid its damage, and ensure safety;
[0038] (2) By the combined use of the electric push rod 13, the insertion block 15 and the insertion hole 12 in the utility model, it is convenient to position the vertical position of the pin 5 when the pin 5 is inserted into the cable locking block 3, so as to ensure the stability of the insertion state of the pin 5 and the cable locking block 3;
[0039] (3) By arranging the upper limit sensor 16 and the lower limit sensor 18 in the utility model, it can not only ensure that the pin 5 does not collide with the pulley under the boom 1, but also avoid the pin 5 from disengaging from the cable locking block 3;
[0040] (4) By arranging the guide cone 6 in the utility model, it is convenient to guide the action of inserting the pin 5 into the cable locking block 3;
[0041] (5) By arranging the limit plate 7 in the utility model, it is convenient to limit the action of inserting the pin 5 into the cable locking block 3, so as to avoid the pin 5 from colliding with the insertion block 15, the upper limit sensor 16, the centering sensor 17 or the lower limit sensor 18.
[0042] The above-described embodiments are only described as the preferred embodiments of the utility model, and do not limit the concept and scope of the utility model. Without departing from the design concept of the utility model, various modifications and improvements made by ordinary engineering and technical personnel in the field to the technical solution of the utility model should fall within the protection scope of the utility model. The technical content claimed by the utility model has been fully recorded in the claims.
Claims
1. A hook block anti-sway device for an offshore crane, comprising a boom, a fixed plate, a pulley, a fixed pulley shaft and a hook block; the boom is arranged horizontally and longitudinally, and two vertically arranged fixed plates are symmetrically arranged at left and right intervals on the left and right sides of its lower surface, and a fixed pulley shaft is horizontally and transversely arranged in the middle position between each two adjacent fixed plates; a plurality of pulleys are respectively arranged on the two fixed pulley shafts in sequence and spaced coaxially along the length direction thereof, and the hook block is connected to the pulley by a steel wire rope, so as to perform a lifting operation; it is characterized in that: The cam is a substantially parallelepiped structure, and the cam is adapted to engage with the two fixed pulley shafts and engage with the two fixed pulley shafts to engage with the two fixed pulley shafts.
2. The anti-sway device for the hook block of an offshore crane according to claim 1, characterized in that: The upper surface of each cable lock block is respectively fitted and fixedly connected to the lower surfaces of the corresponding two mounting plates, and the size of the internal space is required to ensure that the steel wire rope on the pulley extends through the lower end surface of the corresponding cable lock block and is connected to the hook pulley, and does not affect the action of retracting the steel wire rope and pulling the hook pulley.
3. The anti-sway device for the hook block of an offshore crane according to claim 1, characterized in that: The size of each of the latches and the position of the latches fixed on the hook block must ensure that the latches are spaced on the inside relative to the wire rope and do not affect the action of the wire rope retracting and pulling the hook block.
4. The anti-sway device for the hook block of an offshore crane according to claim 1, characterized in that: A limit plate is horizontally fixed inside each cable lock block near its lower surface, and a limit hole matching the plug is vertically embedded and penetrated through the upper surface of each limit plate relative to each plug position, so that the action of inserting the plug into the corresponding cable lock block is limited through the limit hole, and it is ensured that the plug does not collide with the inside of the corresponding cable lock block.
5. The anti-sway device for the hook block of an offshore crane according to claim 4, characterized in that: A plurality of reinforcing plates are evenly spaced and vertically arranged between the lower surface of each limiting plate and the inner wall of the corresponding cable lock block in the circumferential direction, and each reinforcing plate does not extend to the coverage range of the corresponding limiting hole, and the corresponding limiting plate is fixed and reinforced by the reinforcing plates.
6. The anti-sway device for the hook block of an offshore crane according to claim 1, characterized in that: A guide cone is vertically aligned and fixed on the end surface of the insertion end of each of the pins, the lower surface of each guide cone is a large diameter end consistent with the cross-sectional area of the corresponding pin, and the upper surface is a small diameter end, so that the action of inserting the pin into the corresponding cable lock block is guided by the guide cone.
7. The anti-sway device for the hook block of an offshore crane according to claim 4, characterized in that: It also includes a centering sensor; a centering sensor is also horizontally arranged on the right inner wall of the cable lock block on the left side, and the sensing end of the centering sensor is horizontally arranged toward the center direction of the corresponding cable lock block, and its arrangement position needs to ensure that when the centering sensor senses the pin, the upper part of the pin is inserted into the corresponding cable lock block through the limiting hole, and it needs to ensure that when the pin is inserted into the corresponding cable lock block, it does not collide with the centering sensor.
8. The anti-sway device for the hook block of an offshore crane according to claim 7, characterized in that: A lower limit sensor is also horizontally provided on the right inner wall of the cable lock block on the left side, directly below the centering sensor, and the sensing end of the lower limit sensor is horizontally arranged toward the center direction of the corresponding cable lock block, and the lower limit sensor cooperates with the induction of the latch to monitor whether the latch is detached from the corresponding cable lock block; an upper limit sensor is also horizontally provided on the right inner wall of the cable lock block on the left side, directly above the centering sensor, and the sensing end of the upper limit sensor is horizontally arranged toward the center direction of the corresponding cable lock block, and the upper limit sensor cooperates with the induction of the latch to limit the upward lifting of the hook pulley, thereby ensuring that the latch does not collide with the pulley under the boom.
9. The anti-sway device for hook block of offshore crane according to claim 7, characterized in that: The utility model also includes an electric push rod, an insert block and a reinforcing rod; a plug hole is vertically embedded and opened on the outer side surface of each of the plug pins near its upper end, and the plug hole on the left side is arranged on the opposite side of the corresponding centering sensor, each of the plug holes is conical, and the end thereof near the center of the corresponding plug pin is a small diameter end; an electric push rod is horizontally and transversely arranged on the outer side surface of each of the cable lock blocks near its lower end, and the setting position of each of the electric push rods corresponds to the position of the plug hole when the centering sensor senses the plug pin; the pushing end of each of the electric push rods vertically extends to the inside of the corresponding cable lock block, and is screwed and fixed with the corresponding insert block through a flange plate, and pushes the insert block to perform horizontal transverse reciprocating motion inside the corresponding cable lock block; each of the insert blocks matches the small diameter end part of the corresponding plug hole, and under the push of the electric push rod, the plug block is inserted into the corresponding plug hole, and in the process, the insertion action of the corresponding plug block is guided by the large diameter end of the plug hole, and then the plug-in cooperation of the plug block and the plug block ensures the stability of the plug-in state of the plug pin and the cable lock block.
10. The anti-sway device for the hook block of an offshore crane according to claim 9, characterized in that: When the pushing end of each electric push rod is retracted to the extreme position, it is necessary to ensure that the plug block is not located within the coverage range of the corresponding limit hole, thereby ensuring that the pin does not collide with the corresponding plug block when inserted into the corresponding cable lock block; a reinforcement rod is also obliquely fixed between the tail of each electric push rod and the outer side surface of the corresponding cable lock block, and the corresponding electric push rod is fixed and strengthened by the reinforcement rod.