Coal mine transportation device with anti-falling function

Abstract

The invention provides a coal mine transportation device with an anti-falling function, and belongs to the technical field of coal mining and transportation. Comprising a bottom fixing plate component, a wheel frame component, a hopper component, a foldable protective cover assembly and a portable manual operation assembly, Z-shaped elastic pieces are evenly connected between the bottom fixing plate component and the wheel frame component, the purposes of elastic supporting and damping can be achieved, and the problem that a coal mine falls in the transportation process is solved to a certain extent; overturning arms are further rotationally connected between the outer sides of the two ends of the hopper, and a hand-operated wheel arranged at the lower end of one side of the hopper rotates, so that bottom connecting gears which are symmetrically distributed can be synchronously driven to rotate, the bottom connecting gears and outer large gears form matched transmission, and the two overturning arms are driven to synchronously rotate; and the sliding column is gradually and elastically connected to the position which is elastically tangent to the arc-shaped connecting frame in a sliding mode, so that the folding cover can be driven to be safely and stably unfolded, the exposed position of the top of the hopper is covered, and the purpose of preventing coal ore from falling in the transportation process is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining and transportation, and in particular to a coal transportation device with an anti-falling function. Background Art

[0002] Coal is the main solid fuel and a type of combustible organic rock. Coal mines are reasonable spaces dug by humans when digging geological layers rich in coal, usually including tunnels, shafts, and mining faces. After the coal mining is completed, it is necessary to use the tracks laid in the tunnels and transport carts to transport the coal to the surface.

[0003] Most existing transport carts are equipped with a hoistable open hopper. After the transport cart carrying coal ore moves to the surface, the coal ore can be unloaded by hoisting the hopper. However, in order to increase production, the coal ore is usually loaded into the hopper with a pointed tip, which causes the coal ore to fall from the hopper in a bumpy state during transportation, resulting in a large amount of waste in the transportation process. Summary of the invention

[0004] In view of the above problems, the present invention provides a coal mine transportation device with an anti-falling function, comprising a bottom fixing plate component, a wheel frame component, a hopper component, a foldable shield assembly and a portable hand-operated assembly, wherein the bottom fixing plate component comprises a bottom fixing plate, the wheel frame component comprises a wheel frame body, the hopper component comprises a hopper, the foldable shield assembly comprises a sliding column, and the portable hand-operated assembly comprises a hand-operated wheel;

[0005] The wheel frame bodies are symmetrically arranged, and the top of each group of wheel frame bodies is fixedly connected to a group of Z-shaped spring pieces, and the outer bottom end of the bottom fixing plate is fixedly connected to the top of the group of Z-shaped spring pieces;

[0006] A hopper can be placed on the top of the bottom fixing plate, and arc-shaped connecting frames are symmetrically fixedly connected at both ends of the top opening of the hopper;

[0007] The two outer ends of the hopper are symmetrically connected with flip arms, and a folding cover is connected between the outer ends of the two groups of flip arms and the outside of the hopper. With the rotation of the flip arms, the folding cover can be retracted or completely cover the space above the hopper.

[0008] The outer end of each group of the flip arms is also elastically inserted with a slider inwardly, and the slide column is rotatably connected in the slider, and as the flip arms rotate, the slide column slides to the outer arc surface of the arc-shaped connecting frame;

[0009] An outer large gear is fixedly connected to the rotating shaft of each set of the flip arms, the hand-operated wheel is screwed to the middle part of one side of the outer bottom surface of the bottom fixing plate, and the hand-operated wheel is drivingly connected to the two sets of outer large gears.

[0010] Furthermore, the hopper placement groove in the bottom fixing plate component is opened on the top of the main body of the bottom fixing plate.

[0011] Furthermore, axle seats are fixedly installed at the front and rear ends of each group of wheel frame bodies in the wheel frame structure, axles are rotatably connected in each group of the wheel axle seats, and the load-bearing wheels are plugged and fixed at the outer ends of the axles.

[0012] Furthermore, the flip seats in the foldable shield assembly are symmetrically fixedly connected to the middle of the two outer ends of the hopper, each group of the flip seats is rotatably connected to a flip shaft, and the inner end of the flip arm is inserted and fixed in the flip shaft;

[0013] The open limit seat is symmetrically fixedly connected to one side of the two outer ends of the hopper, and the closed limit seat is symmetrically connected to the other side of the two outer ends of the hopper. The top of the open limit seat is fixedly installed with an open fixed magnetic block, and the top of the closed limit seat is fixedly installed with a closed fixed magnetic block;

[0014] Moving magnetic blocks are fixedly mounted on both ends of the main body of the flip arm;

[0015] The folding cover is connected to the outer ends of the two groups of flip arms, the outside of the hopper and between the two groups of open limit seats;

[0016] The outer end of each group of the flip arms is also fixedly connected with a detachable clamping sleeve;

[0017] The outer ends of each group of the ferrules are symmetrically fixed with connecting frames, and the two ends of the transverse connecting frame are respectively inserted and fixed in the connecting frames provided in different ferrules;

[0018] The elastic slide groove is arranged at the outer end of the flip arm, the slider is slidably connected in the elastic slide groove, and an inner compression spring is clamped and installed between the inner top surface of each group of the elastic slide grooves and the slider.

[0019] Furthermore, the outer large gear in the portable hand-operated assembly is plugged and fixed on the outer end of the flip shaft, the bottom connecting gear is meshed on the lower side of the outer large gear, a group of bottom shaft seats are coaxially fixed on the outer bottom surface of the bottom fixing plate, the bottom long shaft is rotatably connected in the bottom shaft seat, and two groups of bottom connecting gears are respectively plugged and fixed on the two ends of the bottom long shaft;

[0020] A medium and large bevel gear is also inserted and fixed in the middle part of the bottom long shaft, a hand-operated shaft seat is fixedly connected to the middle part of one side of the outer bottom surface of the bottom fixing plate, a hand-operated shaft is rotatably connected in the hand-operated shaft seat, the hand-operated wheel is inserted and fixed to the outer end of the hand-operated shaft, the hand-operated bevel gear is inserted and fixed to the inner end of the hand-operated shaft, and the hand-operated bevel gear is meshed with the medium and large bevel gear.

[0021] Furthermore, the hopper is an expanded structure with a larger upper portion and a smaller lower portion.

[0022] Furthermore, the folding cover is made of a composite of PVC and glass fiber.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention symmetrically and evenly fixes and connects Z-shaped spring plates between the top of the wheel frame and the outer bottom surface of the bottom fixing plate. The array of Z-shaped spring plates can jointly form an elastic support for the bottom fixing plate relative to the wheel frame, thereby achieving the purpose of shock absorption, eliminating excessive shaking of the hopper during the movement of the bottom fixing plate, and reducing the risk of the loaded coal falling;

[0025] (2) The present invention also has an arc-shaped connecting frame symmetrically fixedly connected to both ends of the top opening of the hopper, and based on the arc-shaped connecting frame, flip arms are creatively screwed to the two outer ends of the hopper, and a folding cover is connected between the outer ends of the flip arms and the outside of the hopper, and a sliding column is elastically slidably connected to the outer ends of the flip arms. The sliding connection with a certain elasticity formed by the sliding column on the outer arc surface of the arc-shaped connecting frame can improve the stability of the synchronous rotation of the symmetrically distributed flip arms, and at the same time, the arc-shaped connecting frame can also form a supporting effect on the unfolded folding cover, thereby achieving the purpose of protecting the folding cover;

[0026] (3) When the size of the hopper is too large, manually rotating the flip arm directly to drive the opening and closing of the folding cover is relatively unstable and there may be certain risks. Therefore, the present invention provides a portable hand-operated component between the outer bottom surface of the bottom fixed plate and the flip shaft. By manually rotating the hand-operated wheel on one side of the hopper, the symmetrically distributed bottom connecting gears can be synchronously driven to rotate in the same direction. The bottom connecting gears can drive the two sets of flip arms to rotate synchronously and in the same direction through the matching transmission formed with the outer large gear, so that the opening and closing of the folding cover can be safely operated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0028] Figure 1 A schematic diagram of the overall structure of a coal mine transportation device with an anti-falling function provided by the present invention;

[0029] Figure 2 It is a schematic diagram of the position structure of the bottom fixing plate component and the wheel frame component of the present invention;

[0030] Figure 3 It is a schematic diagram of the installation structure of the load-bearing wheel of the present invention;

[0031] Figure 4 It is a schematic diagram of the installation structure of the Z-shaped spring piece of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the hopper component of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the foldable shield assembly of the present invention;

[0034] Figure 7 It is a schematic diagram of the connection structure of the folding cover part of the present invention;

[0035] Figure 8 It is a schematic diagram of the explosion structure of the folding cover part of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the sliding column part of the present invention;

[0037] Fig.10 It is a schematic diagram of the structure of the portable hand-operated assembly of the present invention.

[0038] Figure numerals: 1, bottom fixing plate component; 2, wheel frame component; 3, hopper component; 4, foldable shield component; 5, portable hand-operated component; 101, bottom fixing plate; 102, hopper placement slot; 201, wheel frame body; 202, wheel axle seat; 203, wheel axle; 204, load-bearing wheel; 205, Z-shaped spring piece; 301, hopper; 302, arc-shaped connecting frame; 401, flip seat; 402, flip shaft; 403, flip arm; 404, open limit seat; 405, open fixed magnetic block; 4 06, closed limit seat; 407, closed fixed magnetic block; 408, moving magnetic block; 409, folding cover; 410, ferrule; 411, connecting frame seat; 412, horizontal connecting frame; 413, elastic slide groove; 414, slider; 415, slide column; 416, internal compression spring; 501, outer large gear; 502, bottom shaft seat; 503, bottom long shaft; 504, bottom connecting gear; 505, medium and large bevel gear; 506, manual shaft seat; 507, manual shaft; 508, manual bevel gear; 509, manual wheel. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0040] Please refer to the attached Figure 1-10 An example is given to describe a coal mine transportation device with an anti-falling function provided by the present invention.

[0041] Embodiment 1:

[0042] Based on the bottom fixing plate component 1, the wheel frame component 2 and the hopper component 3, the embodiment of the present invention for loading and transporting coal mines is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown;

[0043] The hopper placement groove 102 in the bottom fixing plate component 1 is opened on the main body top of the bottom fixing plate 101, and is used to place the hopper 301 and limit the outer bottom end of the hopper 301 to prevent the hopper 301 from shaking during transportation. The two ends of the top opening of the hopper 301 are symmetrically fixedly connected with arc-shaped connecting frames 302;

[0044] In addition, the hopper 301 has an expanded structure with a larger top and a smaller bottom, which can increase the loading capacity;

[0045] The front and rear ends of each wheel frame body 201 in the wheel frame structure 2 are fixedly installed with axle seats 202, and each wheel axle seat 202 is rotatably connected with a wheel axle 203. The load-bearing wheel 204 is plugged and fixed to the outer end of the wheel axle 203. The device can move in the transport track through the array of load-bearing wheels 204 to transport coal mines.

[0046] The top of each wheel frame body 201 is fixedly connected with a group of Z-shaped spring pieces 205, and the outer bottom end of the bottom fixing plate 101 is fixedly connected with the top of the group of Z-shaped spring pieces 205;

[0047] After the device is moved to the designated position, the coal ore can be loaded into the empty hopper 301. Since the arc-shaped connecting frame 302 is located at both ends of the top opening of the hopper 301, the loading and unloading of the coal ore will not be affected.

[0048] During unloading, the hopper 301 can be stably lifted by connecting the lifting structure with the arc-shaped connecting frame 302, so that the unloading work can be carried out safely.

[0049] After the hopper 301 is loaded with coal ore, the driving mechanism can drive the bottom fixing plate component 1, the wheel frame component 2 and the hopper component 3 to move based on the load-bearing wheel 204 and the transport track to achieve the purpose of transporting coal ore;

[0050] And because the Z-shaped spring piece 205 is fixedly connected between the outer bottom surface of the bottom fixing plate 101 and the top of the wheel frame body 201, it can play a role of shock absorption and buffering support for the coal ore loaded in the hopper 301, thereby reducing the falling phenomenon of coal ore during transportation to a certain extent.

[0051] Embodiment 2:

[0052] After adding the foldable shield assembly 4 and the portable hand-operated assembly 5, the present invention can be used to safely transport coal ore. Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown;

[0053] The flip seats 401 in the foldable shield assembly 4 are symmetrically fixedly connected to the middle of the two outer ends of the hopper 301, and each set of flip seats 401 is rotatably connected to a flip shaft 402, and the inner end of the flip arm 403 is inserted and fixed in the flip shaft 402;

[0054] The open limit seat 404 is symmetrically fixedly connected to one side of the two outer ends of the hopper 301, and the closed limit seat 406 is symmetrically connected to the other side of the two outer ends of the hopper 301. The top of the open limit seat 404 is fixedly installed with an open fixed magnetic block 405, and the top of the closed limit seat 406 is fixedly installed with a closed fixed magnetic block 407;

[0055] Both ends of the main body of the flip arm 403 are fixedly installed with moving magnetic blocks 408, and when the flip arm 403 rotates to a position where one set of moving magnetic blocks 408 is attracted to the open fixed magnetic block 405, the folding cover 409 is in a completely retracted state, which will not affect the loading of the coal mine; when the flip arm 403 rotates to a position where another set of moving magnetic blocks 408 is attracted to the closed fixed magnetic block 407, the folding cover 409 is in a completely open state, and the top of the hopper 301 is covered inside;

[0056] The folding cover 409 is connected to the outer ends of the two groups of flip arms 403, the outside of the hopper 301 and between the two groups of open limit seats 404, and as the flip arms 403 rotate, the folding cover 409 can be retracted or completely cover the space above the hopper 301;

[0057] The outer end of each set of flip arms 403 is also fixed with a detachable clamping sleeve 410, and the purpose of the clamping sleeve 410 is to form a stable connection between the folding cover 409 and the outer end of the flip arm 403;

[0058] The outer ends of each set of ferrules 410 are symmetrically fixed with connecting frames 411, and the two ends of the transverse connecting frame 412 are respectively inserted and fixed in the connecting frames 411 set in different ferrules 410, and the transverse connecting frame 412 can play a role of stable support;

[0059] The elastic slide groove 413 is provided at the outer end of the flip arm 403, and the slider 414 is slidably connected in the elastic slide groove 413. An inner compression spring 416 is also clamped and installed between the inner top surface of each group of elastic slide grooves 413 and the slider 414. As the flip arm 403 rotates, the slide post 415 slides to the outer arc surface of the arc-shaped connecting frame 302.

[0060] The purpose of the internal compression spring 416 is to enable the slider 414 to slide elastically in the elastic slide groove 413, thereby eliminating the adverse effect of the deformation of the arc-shaped connecting frame 302 on the sliding of the slide post 415 along the arc-shaped connecting frame 302, so that even if the arc-shaped connecting frame 302 is slightly deformed, the slide post 415 can slide smoothly on the outer arc surface of the arc-shaped connecting frame 302 under the condition that the slider 414 slides elastically.

[0061] The arc-shaped connecting frame 302 can be used as a hoisting component and also as a track for the sliding column 415. The sliding of the sliding column 415 on the outer arc surface of the arc-shaped connecting frame 302 can improve the stability of the synchronous movement process of the symmetrically distributed flip arms 403, so that the two sets of symmetrically distributed flip arms 403 can rotate more smoothly at the same time.

[0062] When the flip arm 403 drives the folding cover 409 to extend to the cover setting position, the arc-shaped connecting frame 302 can also support the inner surface of the extended folding cover 409 to prevent the folding cover 409 from excessively contacting with the coal mine and causing damage;

[0063] The folding cover 409 is made of PVC and glass fiber composite, which can improve the service life and wear resistance;

[0064] The outer large gear 501 in the portable hand-operated assembly 5 is plugged and fixed on the outer end of the flip shaft 402, and the bottom connecting gear 504 is meshed on the lower side of the outer large gear 501. A plurality of bottom shaft seats 502 are coaxially fixed on the outer bottom surface of the bottom fixing plate 101, and the bottom long shaft 503 is rotatably connected to the bottom shaft seat 502. Two groups of bottom connecting gears 504 are respectively plugged and fixed on the two ends of the bottom long shaft 503.

[0065] A medium-large bevel gear 505 is also inserted and fixed in the middle of the bottom long shaft 503, a manual shaft seat 506 is fixedly connected in the middle of one side of the outer bottom surface of the bottom fixing plate 101, a manual shaft 507 is rotatably connected in the manual shaft seat 506, a manual wheel 509 is inserted and fixed at the outer end of the manual shaft 507, a manual bevel gear 508 is inserted and fixed at the inner end of the manual shaft 507, and the manual bevel gear 508 is meshed with the medium-large bevel gear 505;

[0066] When loading and unloading the coal mine, the folding cover 409 in the foldable shield assembly 4 is in a fully retracted state. Only during the transportation of coal ore, the folding cover 409 is in a fully expanded state.

[0067] The hand wheel 509 at the lower end of one side of the rotating hopper 301 is driven by the hand wheel 509 to rotate the hand bevel gear 508 through the hand shaft 507. The hand bevel gear 508 and the middle and large bevel gear 505 form a matching transmission, so that the middle and large bevel gear 505 can drive the bottom connecting gears 504 at both ends to rotate through the bottom long shaft 503. The bottom connecting gear 504 on the same side forms a matching transmission with the outer large gear 501, and the two sets of flip arms 403 can be driven to rotate synchronously and in the same direction through the flip shaft 402.

[0068] The folding cover 409 can be driven to unfold by the rotation of the flip arm 403 toward the closing limit seat 406, and in this process, the slide post 415 will elastically slide into the outer arc surface of the arc-shaped connecting frame 302, and the sliding cooperation formed by the fixed arc-shaped connecting frame 302 and the slide post 415 can make the two sets of flip arms 403 move stably;

[0069] After the flip arm 403 moves to the position where the closed solid magnetic block 407 is magnetically attracted to the moving magnetic block 408 on the same side, the folding cover 409 will completely cover the top opening of the hopper 301, and will also cover the coal ore exposed outside the hopper 301, thereby preventing the coal ore from falling during transportation.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coal mine transport device with an anti-falling function, comprising a bottom fixing plate component (1) and a wheel frame component (2), characterized in that: It also includes a hopper component (3), a foldable shield component (4) and a portable hand-operated component (5); The bottom fixing plate component (1) comprises a bottom fixing plate (101), the wheel frame component (2) comprises a wheel frame body (201), the hopper component (3) comprises a hopper (301), the foldable shield component (4) comprises a slide column (415), and the portable hand-operated component (5) comprises a hand-operated wheel (509); The wheel frame body (201) is symmetrically arranged, and the top of each group of the wheel frame bodies (201) is fixedly connected to a group of Z-shaped spring pieces (205). The outer bottom end of the bottom fixing plate (101) is fixedly connected to the top of the group of Z-shaped spring pieces (205). The top of the bottom fixing plate (101) can be placed with a hopper (301). The two ends of the top opening of the hopper (301) are symmetrically fixedly connected with arc-shaped connecting frames (302). The two outer ends of the hopper (301) are also symmetrically screwed with flip arms (403). A folding cover (409) is connected between the outer ends of the two groups of flip arms (403) and the outside of the hopper (301), and as the flip arms (403) are rotated, the hopper (301) is rotated. The folding cover (409) can be shrunk or completely cover the space above the hopper (301). The outer end of each group of the flip arms (403) is also elastically inserted with a slider (414) inwardly, and the slide column (415) is rotatably connected to the slider (414). As the flip arms (403) rotate, the slide column (415) slides to the outer arc surface of the arc connecting frame (302). The rotation axis of each group of the flip arms (403) is also fixedly connected to an outer large gear (501). The hand wheel (509) is rotatably connected to the middle part of one side of the outer bottom surface of the bottom fixing plate (101), and the hand wheel (509) is transmission-connected to the two groups of outer large gears (501).

2. The coal mine transportation device with anti-falling function according to claim 1 is characterized in that: The hopper (301) is a flared structure with a larger top and a smaller bottom.

3. A coal mine transportation device with anti-falling function according to claim 1 or 2, characterized in that: The bottom fixing plate component (1) further comprises a hopper placement groove (102), wherein the hopper placement groove (102) is arranged on the top of the main body of the bottom fixing plate (101).

4. A coal mine transportation device with anti-falling function according to claim 1 or 2, characterized in that: The wheel frame structure (2) further comprises a load-bearing wheel (204), and wheel axle seats (202) are fixedly mounted at both ends of each set of the wheel frame bodies (201), and a wheel axle (203) is rotatably connected to each set of the wheel axle seats (202), and the load-bearing wheel (204) is plugged and fixed to the outer end of the wheel axle (203).

5. A coal mine transportation device with anti-falling function according to claim 1 or 2, characterized in that: The foldable shield assembly (4) further comprises a flip seat (401), an open limit seat (404), a closed limit seat (406), a transverse connecting frame (412) and an elastic slide groove (413); the flip seat (401) is symmetrically fixedly connected to the middle of the two outer ends of the hopper (301); each group of the flip seats (401) is rotatably connected to a flip shaft (402); the inner end of the flip arm (403) is plugged and fixed in the flip shaft (402); the open limit seat (404) is symmetrically fixedly connected to one side of the two outer ends of the hopper (301); the closed limit seat (406) is symmetrically connected to the other side of the two outer ends of the hopper (301); the open limit seat (404) is symmetrically connected to the middle of the two outer ends of the hopper (301); An open solid magnetic block (405) is fixedly installed at the top, a closed solid magnetic block (407) is fixedly installed at the top of the closed limit seat (406), moving magnetic blocks (408) are fixedly installed at both ends of the main body of the flip arm (403), the folding cover (409) is connected to the outer ends of the two groups of flip arms (403), the outside of the hopper (301) and between the two groups of open limit seats (404), the outer end of each group of the flip arms (403) is also fixedly connected to a clamping sleeve (410), and the outer end of each group of the clamping sleeve (410) is symmetrically fixed with a connecting frame seat (411), and the two ends of the horizontal connecting frame (412) are respectively inserted and fixed in the connecting frame seats (411) set in different clamping sleeves (410).

6. The coal mine transportation device with anti-falling function according to claim 5, characterized in that: The elastic slide groove (413) is opened at the outer end of the flip arm (403), and the slider (414) is slidably connected in the elastic slide groove (413). An internal compression spring (416) is also clamped and installed between the inner top surface of each group of the elastic slide grooves (413) and the slider (414).

7. A coal mine transport device with anti-falling function according to claim 1, 2 or 6, characterized in that: The folding cover (409) is made of a composite of PVC and glass fiber.

8. The coal mine transportation device with anti-falling function according to claim 6 is characterized in that: The portable hand-operated assembly (5) further comprises a bottom long shaft (503), a bottom connecting gear (504) and a hand-operated bevel gear (508); the outer large gear (501) is plugged and fixed to the outer end of the flip shaft (402); the bottom connecting gear (504) is meshed with the lower side of the outer large gear (501); a plurality of bottom shaft seats (502) are coaxially fixed to the outer bottom surface of the bottom fixing plate (101); the bottom long shaft (503) is rotatably connected to the bottom shaft seat (502); two groups of bottom connecting gears (504) are respectively plugged and fixed to the bottom long shaft (503); At both ends of the shaft (503), a medium and large bevel gear (505) is inserted and fixed in the middle of the bottom long shaft (503), a hand-operated shaft seat (506) is fixedly connected in the middle of one side of the outer bottom surface of the bottom fixing plate (101), a hand-operated shaft (507) is rotatably connected in the hand-operated shaft seat (506), the hand-operated wheel (509) is inserted and fixed on the outer end of the hand-operated shaft (507), the hand-operated bevel gear (508) is inserted and fixed on the inner end of the hand-operated shaft (507), and the hand-operated bevel gear (508) is meshed with the medium and large bevel gear (505).

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