Material discharging device for civil construction

Abstract

The invention relates to the technical field of civil engineering, and discloses a material discharging device for civil construction. The top of a stable bottom plate is fixedly connected with a main supporting column, the surface of the main supporting column is movably sleeved with a limiting lantern ring, the main supporting column is internally and fixedly sleeved with an auxiliary supporting column, and the position, located at the top end, of the surface of the auxiliary supporting column is fixedly sleeved with a lifting rod; and the left side of the lifting rod is fixedly connected with a balancing weight, the position, penetrating through the top of the lifting rod, of the auxiliary supporting column is in transmission connection with a servo motor, and the bottom of the servo motor is fixedly connected to the top of the lifting rod. The electronic weighing mechanism weighs the placed materials in real time, the situation that the discharging device is overweight and damaged due to the fact that the placed materials are high in weight is avoided, in the discharging process, the position of the conveyed materials is limited, and the situation that the conveyed materials shake in the conveying process and are collided and damaged is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and more specifically to a material unloading device for civil engineering construction. Background Art

[0002] Civil engineering is a general term for the science and technology of building various land engineering facilities. It refers to the materials and equipment used, as well as the technical activities such as survey, design, construction, maintenance and repair carried out, as well as the objects of engineering construction, that is, various engineering facilities built on the ground or underground or on land, which directly or indirectly serve human life, production, military and scientific research. Civil engineering refers to the various technical work such as survey, planning, design, construction, installation and maintenance carried out for the new construction, reconstruction or expansion of buildings, structures and related supporting facilities of various projects, in addition to house construction, and the completed engineering entities. In the process of civil engineering construction, some materials need to be transported in a quantitative and short distance, so material unloading devices are required.

[0003] With the existing material unloading devices for civil construction, when unloading materials to high or low construction locations, the transported materials will shake when moving in the air, and the shaking may cause the materials to collide and be damaged, thereby causing certain economic losses. In addition, when the materials shake and collide, they may become loose and fall, posing a major safety hazard. In addition, the weight of the materials cannot be controlled during the unloading and transportation of the materials, which may result in overweight, thereby increasing the load on the unloading device and reducing the service life of the device. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the implementation rules of the present invention provide a material unloading device for civil engineering construction to solve the technical problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a material unloading device for civil construction, comprising a stable base plate, characterized in that: a main support column is fixedly connected to the top of the stable base plate, a limiting collar is movably sleeved on the surface of the main support column, a secondary support column is fixedly sleeved inside the main support column, a lifting rod is fixedly sleeved on the surface of the secondary support column at the top position, a counterweight is fixedly connected to the left side of the lifting rod, the secondary support column is located at a position passing through the top of the lifting rod and is transmission-connected to a servo motor, the bottom of the servo motor is fixedly connected to the top position of the lifting rod, a mounting frame is provided on the side of the lifting rod away from the counterweight, a rotating wheel axle is movably connected inside the mounting frame, a rotating motor is fixedly connected to one side of the surface of the mounting frame, and the rotating The driving motor is connected to the rotating wheel axle through transmission, and a steel wire rope is fixedly connected to the surface of the rotating wheel axle, and the end of the steel wire rope away from the rotating wheel axle is fixedly connected to the first plate, and the bottom of the first plate is fixedly connected to an electronic weighing mechanism, and one side of the surface of the electronic weighing mechanism is fixedly connected to the end of the limiting ring away from the main support column. Through the limiting ring and the electronic weighing mechanism, it is beneficial to weigh the placed materials in real time through the electronic weighing mechanism when unloading civil construction materials, to prevent the placed materials from being overweight and damaged due to the high weight of the placed materials, to increase the service life of the unloading device, and in the process of unloading, limit the position of the conveyed materials to prevent the materials from shaking during the conveying process, which may cause the conveyed materials to be damaged by collision.

[0006] In a preferred embodiment, the limiting ring includes a ring body, the ring body is provided with a circular hole groove at the position of the movably sleeved main support column, the inner wall of the circular hole groove is provided with a circular inner groove, and the inside of the circular inner groove is movably connected with neatly arranged axial balls, and a limiting connecting rod is fixedly connected to one side of the surface of the ring body, and the limiting connecting rod is fixedly connected to a position on one side of the surface of the stable bottom plate away from one end of the ring body. Through the axial ball in the circular inner groove, it is beneficial to drive the limiting ring to one end of the surface of the main support column when the material is conveyed, so as to prevent the friction between the limiting rings from being too large and affecting the conveying of the material.

[0007] In a preferred embodiment, the lifting rod is provided with a circular through hole at the position where the secondary support column is fixedly connected, and the rotating wheel axle is provided with an axle groove at the position where the steel wire rope is fixedly connected. The axle groove provided by the rotating wheel axle facilitates the winding of the steel wire rope used for unloading, thereby completing the unloading operation.

[0008] In a preferred embodiment, the steel wire rope is fixedly connected to an auxiliary balancing block at one end close to the first plate, and auxiliary connecting ropes are fixedly connected to the surface of the auxiliary balancing block on all four sides, and the auxiliary connecting ropes are fixedly connected to the four corners of the top of the first plate at one end away from the auxiliary balancing block. The auxiliary balancing block and the auxiliary connecting rope are helpful to stably connect and fix the first plate for unloading, thereby preventing the first plate from tilting and affecting the safety of unloading.

[0009] In a preferred embodiment, the four corners of the first plate are fixedly connected with mounting pillars, the surface of the mounting pillars is fixedly connected with the second plate near the bottom, both sides of the top of the first plate are movably connected with auxiliary limiting plates, the inner position of one side of the surface of the first plate is movably connected with a clamping adjustment mechanism, circular holes are provided on the surfaces of the first plate and the second plate at the positions of the movably connected auxiliary limiting plates, and both sides of the bottom of the first plate are movably connected with clamping plates. The mounting pillars, the auxiliary limiting plates and the clamping plates are convenient for connecting the first plate and the second plate through the mounting pillars, limiting the material at the adjacent side of the first plate and the second plate through the auxiliary limiting plates, and fixing the material through the clamping plates to avoid the occurrence of safety hazards caused by the loosening and falling of the material during transportation.

[0010] In a preferred embodiment, the electronic weighing mechanism includes an electronic scale body, a display screen is provided on one side of the surface of the electronic scale body, an adjustment button is provided on the electronic scale body at the bottom of the display screen, a pressure rod is fixedly connected to the top of the electronic scale body, and a load-bearing plate is fixedly connected to the top of the pressure rod. The electronic weighing mechanism is conducive to real-time weight measurement of the conveyed material, avoiding the high weight of the conveyed material affecting the normal use of the device, thereby increasing the service life of the device.

[0011] In a preferred embodiment, a rectangular slider is fixedly connected to the top of the clamping plate at the position of the movable connection first plate, and a circular adjustment hole is opened inside the rectangular slider. The clamping plate is helpful to clamp and fix the conveyed material, preventing the material from sliding, tilting or even falling during the conveying process, thereby avoiding the occurrence of safety hazards.

[0012] In a preferred embodiment, the clamping adjustment mechanism includes a bidirectional threaded rod, both ends of the bidirectional threaded rod are fixedly connected to limit plates, the surface of the limit plate away from the bidirectional threaded rod is fixedly connected to a rotating handle, and the surface of the rotating handle is fixedly sleeved with an anti-slip leather cover. By rotating the handle and the anti-slip leather cover, it is beneficial to drive the limit plate and the bidirectional threaded rod to rotate, so that the bidirectional threaded rod drives the clamping plate to move to clamp and fix the conveyed material, and the anti-slip leather cover can prevent hands from sweating and slipping during rotation, thereby increasing practicality.

[0013] Technical effects and advantages of the present invention: The present invention is provided with a limiting collar and an electronic weighing mechanism, which is conducive to real-time weighing of the placed materials through the electronic weighing mechanism when the civil construction materials are unloaded, thereby preventing the unloading device from being damaged due to overweight caused by the high weight of the placed materials, thereby increasing the service life of the unloading device, and limiting the position of the conveyed materials during the unloading process, thereby preventing the materials from shaking during the conveying process, thereby preventing the conveyed materials from being damaged by collision. The present invention is provided with an auxiliary limiting plate, a clamping plate and a clamping adjustment mechanism, which is conducive to controlling the clamping plate through the clamping plate during the material unloading and conveying process, so that the clamping plate clamps and fixes the conveyed material, thereby preventing the clamping plate from shaking during the conveying process, and preventing the material from falling off the position between the first plate and the second plate through the auxiliary limiting plate, thereby preventing the material from falling off and causing safety hazards; BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 3 It is a schematic cross-sectional view of the limiting collar structure of the present invention.

[0017] Figure 4 It is a schematic diagram of the lifting rod structure of the present invention.

[0018] Figure 5 It is a schematic diagram of the steel wire rope structure of the present invention.

[0019] Figure 6 It is a schematic diagram of the plate structure of the present invention.

[0020] Figure 7 It is a schematic diagram of the structure of the electronic weighing mechanism of the present invention.

[0021] Figure 8 It is a schematic diagram of the clamping plate structure of the present invention.

[0022] Fig. 9 It is a schematic diagram of the structure of the clamping and adjusting mechanism of the present invention.

[0023] The accompanying drawings are marked as follows: 1. Stable bottom plate; 2. Main support column; 3. Limiting collar; 301. Collar body; 302. Circular hole groove; 303. Circular inner groove; 304. Axis ball; 305. Limiting connecting rod; 4. Secondary support column; 5. Lifting rod; 501. Circular through hole; 6. Counterweight block; 7. Servo motor; 8. Mounting frame; 9. Rotating axle; 901. Axle groove; 10. Rotating motor; 11. Wire rope; 1101. Auxiliary balancing block; 1102. Auxiliary connecting rope; 12. First plate block; 1201, second plate; 13, electronic weighing mechanism; 1301, electronic scale body; 1302, display screen; 1303, adjustment button; 1304, pressure rod; 1305, load-bearing plate; 14, mounting support; 15, auxiliary limiting plate; 16, clamping adjustment mechanism; 1601, two-way threaded rod; 1602, limit plate; 1603, rotating handle; 1604, non-slip leather cover; 17, circular hole; 18, clamping plate; 1801, rectangular slider; 1802, circular adjustment hole. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The material unloading device for civil construction involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0025] Reference Figure 1-Figure 9 The present invention provides a material unloading device for civil engineering construction, including a stable base plate 1, characterized in that: a main support column 2 is fixedly connected to the top of the stable base plate 1, a limiting collar 3 is movably sleeved on the surface of the main support column 2, a secondary support column 4 is fixedly sleeved inside the main support column 2, a lifting rod 5 is fixedly sleeved on the surface of the secondary support column 4 at the top position, a counterweight block 6 is fixedly connected to the left side of the lifting rod 5, the secondary support column 4 is located at a position passing through the top of the lifting rod 5 and is transmission-connected to a servo motor 7, and the bottom of the servo motor 7 is fixedly connected to the top position of the lifting rod 5. A mounting frame 8 is provided on the side of the lifting rod 5 away from the counterweight block 6, and a rotating axle 9 is movably connected inside the mounting frame 8. A rotating motor 10 is fixedly connected to the surface of the mounting frame 8. The rotating motor 10 is transmission-connected to the rotating axle 9. A steel wire rope 11 is fixedly connected to the surface of the rotating axle 9. The end of the steel wire rope 11 away from the rotating axle 9 is fixedly connected to a first plate 12. An electronic weighing mechanism 13 is fixedly connected to the bottom of the first plate 12. One side of the surface of the electronic weighing mechanism 13 is fixedly connected to an end of the limiting ring 3 away from the main support column 2.

[0026] In this embodiment, by limiting the ring 3 and the electronic weighing mechanism 13, it is beneficial to weigh the placed materials in real time through the electronic weighing mechanism 13 when unloading civil construction materials, to prevent the unloading device from being overweight and damaged due to the high weight of the placed materials, to increase the service life of the unloading device, and to limit the position of the conveyed materials during the unloading process to prevent the materials from shaking during the conveying process, which may cause the conveyed materials to be damaged by collision.

[0027] Reference Figure 3 As shown, the limiting collar 3 includes a collar body 301, the collar body 301 is provided with a circular hole 302 at a position where the main support column 2 is movably sleeved, the inner wall of the circular hole 302 is provided with a circular inner groove 303, and the inner part of the circular inner groove 303 is movably connected with neatly arranged axial balls 304, and a limiting connecting rod 305 is fixedly connected to one side of the surface of the collar body 301, and the end of the limiting connecting rod 305 away from the collar body 301 is fixedly connected to one side of the surface of the stable base plate 1. In this embodiment, the axial ball 304 in the circular inner groove 303 is conducive to driving the limiting ring 3 on one end of the surface of the main support column 2 when the material is transported, thereby preventing the friction between the limiting rings 3 from being too large and affecting the transportation of the material.

[0028] Reference Figure 4 The lifting rod 5 is located at a position where it is fixedly sleeved with the auxiliary support column 4 and is provided with a circular through hole 501 , and the rotating axle 9 is located at a position where it is fixedly connected with the wire rope 11 and is provided with an axle groove 901 .

[0029] In this embodiment, the axle groove 901 formed by rotating the axle 9 is conducive to winding up the wire rope 11 used for unloading, thereby completing the unloading operation.

[0030] Reference Figure 5 As shown, the end of the steel wire rope 11 close to the first plate 12 is fixedly connected to an auxiliary balancing block 1101, and auxiliary connecting ropes 1102 are fixedly connected to the surface of the auxiliary balancing block 1101 on all four sides. The ends of the auxiliary connecting ropes 1102 away from the auxiliary balancing block 1101 are fixedly connected to the four corners of the top of the first plate 12.

[0031] In this embodiment, the auxiliary balancing block 1101 and the auxiliary connecting rope 1102 are used to stably connect and fix the first plate 12 for blanking, thereby preventing the first plate 12 from tilting and affecting the safety of blanking.

[0032] Reference Figure 5-Figure 6As shown, the four corners of the first plate 12 are fixedly connected to mounting pillars 14, the surface of the mounting pillars 14 is fixedly connected to the second plate 1201 near the bottom, both sides of the top of the first plate 12 are movably connected to auxiliary limiting plates 15, a clamping adjustment mechanism 16 is movably connected to an inner position on one side of the surface of the first plate 12, circular holes 17 are provided on the surfaces of the first plate 12 and the second plate 1201 at the positions where the auxiliary limiting plates 15 are movably connected, and clamping plates 18 are movably connected to both sides of the bottom of the first plate 12.

[0033] In this embodiment: by installing the pillar 14, the auxiliary limiting plate 15, and the clamping plate 18, it is beneficial to connect the first plate 12 and the second plate 1201 through the installing pillar 14, and limit the material to the adjacent side position of the first plate 12 and the second plate 1201 through the auxiliary limiting plate 15, and fix the material through the clamping plate 18 to avoid the occurrence of safety hazards caused by the loosening and falling of the material during transportation.

[0034] Reference Figure 7 As shown, the electronic weighing mechanism 13 includes an electronic scale body 1301, a display screen 1302 is provided on one side of the surface of the electronic scale body 1301, an adjustment button 1303 is provided at the bottom of the display screen 1302 of the electronic scale body 1301, a pressure rod 1304 is fixedly connected to the top of the electronic scale body 1301, and a load-bearing plate 1305 is fixedly connected to the top of the pressure rod 1304.

[0035] In this embodiment, the electronic weighing mechanism 13 is used to measure the weight of the conveyed material in real time, thereby preventing the conveyed material from having a high weight and affecting the normal use of the device, thereby increasing the service life of the device.

[0036] Reference Figure 8 As shown, a rectangular slider 1801 is fixedly connected to the top of the clamping plate 18 at a position movably connected to the first plate 12 , and a circular adjustment hole 1802 is opened inside the rectangular slider 1801 .

[0037] In this embodiment, the clamping plate 18 is used to clamp and fix the conveyed material, thereby preventing the material from sliding, tilting or even falling during the conveying process, thereby avoiding the occurrence of safety hazards.

[0038] Reference Fig. 9 As shown, the clamping adjustment mechanism 16 includes a bidirectional threaded rod 1601, both ends of which are fixedly connected to limiting plates 1602, and the surface of the limiting plate 1602 away from the bidirectional threaded rod 1601 is fixedly connected to a rotating handle 1603, and the surface of the rotating handle 1603 is fixedly sleeved with an anti-slip leather cover 1604.

[0039] In this embodiment: by rotating the handle 1603 and the anti-slip leather cover 1604, it is helpful to drive the limit plate 1602 and the bidirectional threaded rod 1601 to rotate, so that the bidirectional threaded rod 1601 drives the clamping plate 18 to move to clamp and fix the conveyed material, and the anti-slip leather cover 1604 can prevent the hands from sweating and slipping during rotation, thereby increasing practicality.

[0040] The working principle of the present invention is as follows: first, when using the electronic scale, the auxiliary limiting plates 15 on both sides of the top of the first plate 12 are pulled out upwards, so that the auxiliary limiting plates 15 are away from the first plate 12 and the circular holes 17 opened in the second plate 1201, and then the material to be unloaded is placed on the top of the second plate 1201. At this time, the material squeezes the load-bearing plate 1305, so that the load-bearing plate 1305 squeezes the pressure rod 1304, and then the weight is measured by the electronic scale body 1301, and then the weight of the material can be observed on the display screen 1302 on the surface of the electronic scale body 1301. When the material reaches the weight limit, the auxiliary limiting plates 15 are pulled back. The auxiliary limiting plate 15 limits the material on the top of the second plate 1201, and then the non-slip leather cover 1604 on the surface of the rotating handle 1603 is held and rotated, so that the rotating handle 1603 drives the limiting plate 1602 and the two-way threaded rod 1601 to rotate. At this time, the rotation of the two-way threaded rod 1601 drives the rectangular slider 1801 to move. At this time, the clamping plate 18 clamps and fixes the material. Then, after the clamping is completed, the rotating motor 10 is turned on so that the rotating motor 10 drives the rotating wheel shaft 9 inside the mounting frame 8 to rotate. At this time, the rotation of the rotating wheel shaft 9 causes the wheel shaft groove 901 to reel in the wire rope 11. At this time, the wire rope 11 brings The materials on the top of the first plate 12 and the second plate 1201 are moved up. At this time, the limiting connecting rod 305 fixed on one side of the electronic weighing mechanism 13 at the bottom of the second plate 1201 is sleeved on the surface of the main support column 2 through the collar body 301, so that the electronic weighing mechanism 13 limits the position of the second plate 1201. At this time, the second plate 1201 rises smoothly to avoid shaking when the second plate 1201 rises. Then the rising of the second plate 1201 makes the axial ball 304 in the circular inner groove 303 on the inner wall of the collar body 301 rotate in the circular inner groove 303 and the surface of the main support column 2, thereby reducing the collar body 301 and the main support column 2. The friction between the surfaces is reduced to prevent the ring body 301 from affecting the lifting of the second plate 1201. Then, when the material on the top of the second plate 1201 needs to be transported to other positions, the servo motor 7 is turned on to make the servo motor 7 drive the lifting rod 5 to rotate, and the counterweight of the counterweight block 6 keeps the lifting rod 5 stable to avoid tilting. After the turning is completed, the servo motor 7 is turned off, and then the rotating motor 10 is turned on again to reel in or lower the wire rope 11 so that the second plate 1201 reaches the conveying position. At this time, the auxiliary limiting plate 15 is removed, and then the clamping adjustment mechanism 16 is rotated in the opposite direction again so that the clamping plate 18 stops clamping the material.

[0041] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A material unloading device for civil engineering construction, comprising a stable base plate (1), characterized in that: The top of the stable base plate (1) is fixedly connected to a main support column (2), a limiting ring (3) is movably sleeved on the surface of the main support column (2), a secondary support column (4) is fixedly sleeved inside the main support column (2), a lifting rod (5) is fixedly sleeved on the surface of the secondary support column (4) at the top position, a counterweight (6) is fixedly connected to the left side of the lifting rod (5), the secondary support column (4) is located at a position passing through the top of the lifting rod (5) and is transmission-connected to a servo motor (7), the bottom of the servo motor (7) is fixedly connected to the top of the lifting rod (5), and a mounting hole is provided on the side of the lifting rod (5) away from the counterweight (6). A mounting frame (8), wherein a rotating axle (9) is movably connected inside the mounting frame (8), a rotating motor (10) is fixedly connected to one side of the surface of the mounting frame (8), the rotating motor (10) is transmission-connected to the rotating axle (9), a steel wire rope (11) is fixedly connected to the surface of the rotating axle (9), an end of the steel wire rope (11) away from the rotating axle (9) is fixedly connected to a first plate (12), an electronic weighing mechanism (13) is fixedly connected to the bottom of the first plate (12), and one side of the surface of the electronic weighing mechanism (13) is fixedly connected to an end of the limiting ring (3) away from the main support column (2).

2. A material unloading device for civil engineering construction according to claim 1, characterized in that: The limiting collar (3) comprises a collar body (301), wherein the collar body (301) is provided with a circular hole groove (302) at a position where the collar body (301) is movably connected to the main support column (2), wherein the inner wall of the circular hole groove (302) is provided with a circular inner groove (303), wherein the inner part of the circular inner groove (303) is movably connected with neatly arranged axial balls (304), and a limiting connecting rod (305) is fixedly connected to one side of the surface of the collar body (301), and the limiting connecting rod (305) is fixedly connected to one side of the surface of the stabilizing base plate (1) at one end away from the collar body (301).

3. The material unloading device for civil engineering construction according to claim 1, characterized in that: The lifting rod (5) is provided with a circular through hole (501) at a position where it is fixedly sleeved on the auxiliary support column (4), and the rotating wheel axle (9) is provided with a wheel axle groove (901) at a position where it is fixedly connected to the steel wire rope (11).

4. The material unloading device for civil engineering construction according to claim 1, characterized in that: An end of the steel wire rope (11) close to the first plate (12) is fixedly connected to an auxiliary balancing block (1101), and auxiliary connecting ropes (1102) are fixedly connected to the surface of the auxiliary balancing block (1101) on all four sides, and ends of the auxiliary connecting ropes (1102) away from the auxiliary balancing block (1101) are fixedly connected to the four corners of the top of the first plate (12).

5. The material unloading device for civil engineering construction according to claim 1, characterized in that: The first plate (12) is fixedly connected to mounting pillars (14) at the four corners, the second plate (1201) is fixedly connected to the surface of the mounting pillar (14) near the bottom, auxiliary limiting plates (15) are movably connected to the two sides of the top of the first plate (12), a clamping adjustment mechanism (16) is movably connected to the inner position of one side of the surface of the first plate (12), circular holes (17) are provided on the surfaces of the first plate (12) and the second plate (1201) at the positions movably connected to the auxiliary limiting plates (15), and clamping plates (18) are movably connected to the two sides of the bottom of the first plate (12).

6. The material unloading device for civil engineering construction according to claim 1, characterized in that: The electronic weighing mechanism (13) comprises an electronic scale body (1301), a display screen (1302) is provided on one side of the surface of the electronic scale body (1301), an adjustment button (1303) is provided at the bottom of the display screen (1302) of the electronic scale body (1301), a pressure rod (1304) is fixedly connected to the top of the electronic scale body (1301), and a load-bearing plate (1305) is fixedly connected to the top of the pressure rod (1304).

7. The material unloading device for civil engineering construction according to claim 5, characterized in that: A rectangular slider (1801) is fixedly connected to the top of the clamping plate (18) at a position movably connected to the first plate (12), and a circular adjustment hole (1802) is provided inside the rectangular slider (1801).

8. The material unloading device for civil engineering construction according to claim 5, characterized in that: The clamping adjustment mechanism (16) comprises a bidirectional threaded rod (1601), both ends of the bidirectional threaded rod (1601) are fixedly connected to a limit plate (1602), a rotating handle (1603) is fixedly connected to the surface of the limit plate (1602) away from the bidirectional threaded rod (1601), and a non-slip leather cover (1604) is fixedly sleeved on the surface of the rotating handle (1603).

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