Pipeline connecting device for irrigation and water conservancy

Abstract

The utility model discloses a pipeline connecting device for irrigation and water conservancy, and relates to the technical field of irrigation and water conservancy pipeline connection, the pipeline connecting device comprises a mounting plate, the upper end of the mounting plate is fixedly connected with a transmission mechanism, and the left side and the right side of the transmission mechanism are respectively provided with an adjustable jacking mechanism. Through mutual cooperation of a worm I, a worm gear I, a threaded rod I, a fixed rod I, a vertical plate II and a vertical plate III, two jacking plates on the left side and two jacking plates on the right side can be driven to be close to each other in the using process of the device, and then two mounting discs I can be pushed to be close to each other; and at the moment, the installation and connection process between the two pipeline main bodies can be achieved under the mutual cooperation of a limiting rod, a second installation disc and a connecting pipe.

Description

Technical Field

[0001] The utility model relates to a water utilization pipeline connecting device, in particular to a farmland water utilization pipeline connecting device. Background Art

[0002] Farmland water conservancy refers to the comprehensive science and technology of developing irrigation and drainage, regulating regional water conditions, improving the moisture conditions of farmland, preventing and controlling drought, waterlogging, salt and alkali disasters, and promoting stable and high agricultural yields. Farmland water conservancy is generally called irrigation and drainage abroad. In the process of farmland water conservancy, multiple pipes are needed, and pipe connection devices are needed in the process of connecting pipes.

[0003] At present, there are still some defects and shortcomings in the use of water pipe connection devices. The specific areas that need to be improved are as follows:

[0004] Most of the existing water pipe connection devices require other auxiliary tools to complete the installation and connection process between the two pipes when in use, and the process of disassembling the pipes after use is relatively inconvenient. Utility Model Content

[0005] The purpose of the utility model is to provide a farmland water utilization pipeline connection device to solve the problem that the existing water utilization pipeline connection devices proposed in the above background technology mostly need to use other auxiliary tools to complete the installation and connection process between the two pipelines when in use, and the pipeline disassembly process after use is relatively inconvenient.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a farmland water utilization pipeline connection device, including a mounting plate, the upper end of the mounting plate is fixedly connected to a transmission mechanism, the left and right sides of the transmission mechanism are provided with adjustable tightening mechanisms, the relatively close sides of the two adjustable tightening mechanisms are overlapped with the relatively distant ends of the two mounting disks one respectively, the two mounting disks one are fixedly connected to the relatively close ends of the two pipeline bodies respectively, the relatively close ends of the two pipeline bodies are overlapped with the left and right ends of the connecting pipe respectively, the left and right ends of the connecting pipe are fixedly connected with mounting disks two, the two mounting disks two are overlapped with the relatively close ends of the two mounting disks one through waterproof pads provided at their relatively distant ends, and the relatively close ends of the two adjustable tightening mechanisms are movably connected to a rotating sleeve with two guide grooves provided inside.

[0007] As a preferred technical solution of the utility model, the left and right sides of the rotating sleeve are movably connected with support plate one, the outer side of the rotating sleeve is fixedly connected with a rotating grip tube, the lower ends of the two support plates one are fixedly connected to the upper end of the mounting plate, the left and right sides of the connecting tube are fixedly connected with support plate two, and the lower ends of the two support plates two are fixedly connected to the upper end of the mounting plate.

[0008] As a preferred technical solution of the utility model, the two mounting plates 2 are movably connected to the eight limiting rods through the four limiting holes opened therein, and the eight limiting rods are divided into two groups of four, and their relatively distant ends are fixedly connected to the relatively close ends of the two mounting plates 1.

[0009] As a preferred technical solution of the utility model, the transmission mechanism includes two support plates three, the lower ends of the two support plates three are fixedly connected to the upper end of the mounting plate, the two support plates three are movably connected to the front and rear sides of the worm one through the connecting holes opened inside the upper ends thereof, a rotating handle is provided at the front end of the worm one, the worm one is meshed with two worm wheels one for transmission, and the two worm wheels one are fixedly connected to the right ends of the two threaded rods one respectively.

[0010] As a preferred technical solution of the utility model, the left and right sides of the two threaded rods 1 are movably connected with vertical plates 1, the lower ends of the four vertical plates 1 are fixedly connected to the upper end of the mounting plate, the two threaded rods 1 are respectively threadedly connected to the front and rear sides of the two adjustable tightening mechanisms, the four vertical plates 1 are grouped in pairs and their relatively close ends are respectively fixedly connected to the left and right ends of the four fixed rods 1, the four fixed rods 1 are grouped in pairs and are respectively movably connected to the front and rear sides of the two adjustable tightening mechanisms.

[0011] As a preferred technical solution of the utility model, the two adjustable tightening mechanisms each include two vertical plates 2, the four vertical plates 2 are grouped in pairs and are all threadedly connected to the two threaded rods 1 through threaded holes opened therein, and the four vertical plates 2 are grouped in pairs and are all movably connected to the four fixed rods 1 through two circular holes opened therein.

[0012] As a preferred technical solution of the utility model, the four vertical plates two are grouped in twos and their relatively close ends are fixedly connected to the vertical plate three, the four vertical plates three are grouped in twos and their relatively close ends are respectively fixedly connected to the front and rear ends of the four fixing rods two, the four fixing rods two are grouped in twos and are respectively movably connected to four tightening plates with circular holes opened inside at the upper and lower ends, and the four tightening plates are grouped in twos and their relatively close ends are respectively overlapped with the relatively far ends of the two mounting plates one.

[0013] As a preferred technical solution of the utility model, the rear ends of the two rear tightening plates are fixedly connected to two connecting ropes, the front ends of the four connecting ropes respectively pass around four concave guide rods and are fixedly connected to four bolting blocks, the four bolting blocks are grouped in twos, and their relatively close ends are respectively fixedly connected to the relatively far ends of the two front tightening plates, and the four concave guide rods are grouped in twos, and their rear ends are respectively fixedly connected to the front ends of the two rear vertical plates three.

[0014] As a preferred technical solution of the utility model, the two vertical plates three at the rear side are movably connected to the two internally threaded sleeves through the connecting holes opened therein, the two internally threaded sleeves are respectively threadedly connected to the two threaded rods two, the front ends of the two threaded rods two are respectively fixedly connected to the rear ends of the two tightening plates at the rear side, the rear sides of the two internally threaded sleeves are fixedly connected with worm gears two, and the two worm gears two are respectively meshed with the two worm gears two for transmission.

[0015] As a preferred technical solution of the utility model, the two worm gears 2 are movably connected with L-shaped plates at positions relatively far away from the side light rods, and the relatively far ends of the two L-shaped plates are respectively fixedly connected to the relatively close ends of the two rear vertical plates 3, and the two worm gears 2 are movably connected with a rotating sleeve with two guide grooves provided inside through two guide blocks arranged at their relatively close ends, and the front and rear ends of the four fixed rods 2 are both sleeved with springs, and the eight springs are divided into two groups of four, and their relatively far ends are respectively fixedly connected to the relatively close ends of the four vertical plates 3, and the eight springs are divided into two groups of four, and their relatively close ends are respectively fixedly connected to the relatively far sides of the four tightening plates.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model can drive the left and right two top tightening plates to move closer to each other during the use of the device through the cooperation between the provided worm gear one, the worm gear one, the threaded rod one, the fixing rod one, the vertical plate two and the vertical plate three, thereby pushing the two mounting plates one to move closer to each other. At this time, the installation connection process between the two pipe bodies can be achieved under the cooperation between the provided limit rod, the mounting plate two and the connecting pipe. Correspondingly, after the use of the device is finished, the left and right two top tightening plates are driven to move away from each other. Then, under the cooperation between the provided worm gear two, the rotating sleeve, the worm gear two, the internal threaded sleeve, the threaded rod two, the connecting rope, the bolt block, the concave guide rod and the spring, the two top tightening plates corresponding to the front and rear sides can be driven to move away from each other. At this time, the top tightening plates no longer affect the disassembly process of the mounting plate one, thereby conveniently removing the two pipe bodies from the device, thereby making the installation, connection and disassembly process of the pipe body of the device more convenient, and no other auxiliary tools are needed during the installation and disassembly of the pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main cross-sectional three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the main three-dimensional structure of the utility model;

[0020] Figure 3It is a rear-view stereoscopic structural schematic diagram of the utility model;

[0021] Figure 4 This is a schematic diagram of the main three-dimensional structure of the connecting pipe of the utility model;

[0022] Figure 5 This is a schematic diagram of the main three-dimensional structure of the pipeline body of the utility model;

[0023] Figure 6 This is a schematic diagram of the main three-dimensional structure of the transmission mechanism of the utility model;

[0024] Figure 7 It is a left-side stereoscopic structural schematic diagram of the adjustable tightening mechanism of the utility model;

[0025] Figure 8 It is a right-side stereoscopic structural schematic diagram of the adjustable tightening mechanism of the utility model.

[0026] In the figure: 1. mounting plate; 2. pipe body; 3. adjustable tightening mechanism; 31. vertical plate three; 32. spring; 33. fixing rod two; 34. worm gear two; 35. L-shaped plate; 36. internal threaded sleeve; 37. worm gear two; 38. threaded rod two; 39. vertical plate two; 310. tightening plate; 311. bolting block; 312. connecting rope; 313. concave guide rod; 4. mounting plate one; 5. limiting rod; 6. mounting plate two; 7. connecting pipe; 8. support plate two; 9. transmission mechanism; 91. support plate three; 92. vertical plate one; 93. worm gear one; 94. threaded rod one; 95. fixing rod one; 96. worm gear one; 10. support plate one; 11. rotating sleeve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] like Figure 1-8As shown, the utility model provides a technical solution: a farmland water utilization pipeline connection device, including a mounting plate 1, the upper end of the mounting plate 1 is fixedly connected with a transmission mechanism 9, the left and right sides of the transmission mechanism 9 are provided with adjustable top tightening mechanisms 3, the relatively close sides of the two adjustable top tightening mechanisms 3 are respectively overlapped with the relatively far ends of the two mounting plates 1 4, the two mounting plates 1 4 are respectively fixedly connected with the relatively close ends of the two pipeline bodies 2, the relatively close ends of the two pipeline bodies 2 are respectively overlapped with the left and right ends of the connecting pipe 7, the left and right ends of the connecting pipe 7 are fixedly connected with mounting plates 2 6, the two mounting plates 2 6 are respectively overlapped with the relatively close ends of the two mounting plates 1 4 through waterproof pads provided at their relatively far ends, the relatively close ends of the two adjustable top tightening mechanisms 3 are connected with the rotating sleeve 1 with two guide grooves provided inside 1 is movably connected, and the transmission mechanism 9 is arranged to drive the two adjustable tightening mechanisms 3 to approach each other, and then drive the relatively close ends of the two mounting plates 1 4 to overlap with the relatively far ends of the two mounting plates 2 6 respectively, at this time, the docking process between the two pipe bodies 2 and the connecting pipe 7 can be achieved, making the connection process of the two pipe bodies 2 of the device more convenient, and correspondingly, by driving the two adjustable tightening mechanisms 3 to move away from each other, the two adjustable tightening mechanisms 3 no longer play a tightening role on the two mounting plates 1 4, and then the front and rear sides of the two adjustable tightening mechanisms 3 are driven to move away from each other by rotating the rotating sleeve 11, so that the two pipe bodies 2 can be conveniently removed from the device, thereby making the disassembly process of the pipe bodies 2 of the device more convenient.

[0029] The left and right sides of the rotating sleeve 11 are movably connected with support plates 10, and the lower ends of the two support plates 10 are fixedly connected to the upper end of the mounting plate 1. The left and right sides of the connecting tube 7 are fixedly connected with support plates 2 8, and the lower ends of the two support plates 28 are fixedly connected to the upper end of the mounting plate 1. The two mounting disks 2 6 are movably connected with eight limit rods 5 through four limit holes opened therein, respectively. The eight limit rods 5 are divided into two groups of four, and their relatively distant ends are fixedly connected with the relatively close ends of the two mounting disks 1 4, respectively. The mutual cooperation between the set limit rods 5 and the mounting disks 2 6 can limit the installation position of the mounting disk 4.

[0030] The transmission mechanism 9 includes two support plates 3 91, the lower ends of the two support plates 3 91 are fixedly connected to the upper end of the mounting plate 1, and the two support plates 3 91 are movably connected to the front and rear sides of the worm 1 96 through the connection holes opened inside the upper ends thereof. The worm 1 96 is meshed with the two worm wheels 1 93 for transmission. The two worm wheels 1 93 are fixedly connected to the right ends of the two threaded rods 1 94, respectively. The left and right sides of the two threaded rods 1 94 are movably connected with the vertical plates 1 92, and the lower ends of the four vertical plates 1 92 are fixedly connected to the upper end of the mounting plate 1, and the two threaded rods 1 94 are respectively connected to the two adjusting The front and rear sides of the segmented tightening mechanism 3 are threadedly connected, and the four vertical plates 92 are grouped in pairs, and their relatively close ends are fixedly connected to the left and right ends of four fixed rods 95 respectively. The four fixed rods 95 are grouped in pairs and are movably connected to the front and rear sides of the two adjustable tightening mechanisms 3 respectively. By rotating the worm gear 96, the two threaded rods 94 can be driven to rotate under the action of the two worm wheels 93. Then, with the mutual cooperation between the vertical plates 92 and the fixed rods 95, the effect of driving the two adjustable tightening mechanisms 3 to move relative to each other can be achieved.

[0031] The two adjustable tightening mechanisms 3 each include two vertical plates 2 39, the four vertical plates 2 39 are grouped in pairs and are all threadedly connected to the two threaded rods 1 94 through the threaded holes opened therein, the four vertical plates 2 39 are grouped in pairs and are movably connected to the four fixing rods 1 95 through the two circular holes opened therein, the four vertical plates 2 39 are grouped in pairs and their relatively close ends are fixedly connected to the vertical plates 3 31, the four vertical plates 31 are grouped in pairs and their relatively close ends are respectively fixedly connected to the front and rear ends of the four fixing rods 2 33, the four fixing rods 2 33 are grouped in pairs and are movably connected to four tightening plates 310 with circular holes opened therein at the upper and lower ends, the four tightening plates 310 are grouped in pairs and their relatively close ends are respectively overlapped with the relatively far ends of the two mounting plates 1 4, through The rotation of the two threaded rods 1 94 can drive the two left vertical plates 31 and the two right vertical plates 31 to move away from each other after the use of the device is completed under the action of the set fixing rods 1 95 and the vertical plates 2 39, thereby achieving the effect of driving the two left tightening plates 310 and the two right tightening plates 310 to move away from each other, and the rear ends of the two rear tightening plates 310 are fixedly connected to two connecting ropes 312, and the front ends of the four connecting ropes 312 respectively pass through four concave guide rods 313 and are fixedly connected to four bolt blocks 311, and the four bolt blocks 311 are grouped in pairs, and their relatively close ends are fixedly connected to the relatively far ends of the two front tightening plates 310, and the four concave guide rods 313 are grouped in pairs, and their rear ends are fixedly connected to the two rear vertical plates 310. 1, the two vertical plates 31 at the rear side are movably connected with the two internal threaded sleeves 36 through the connecting holes opened inside them, the two internal threaded sleeves 36 are respectively threadedly connected with the two threaded rods 2 38, the front ends of the two threaded rods 2 38 are respectively fixedly connected with the rear ends of the two top tightening plates 310 at the rear side, the rear sides of the two internal threaded sleeves 36 are fixedly connected with worm gears 2 37, the two worm gears 2 37 are respectively meshed with the two worm gears 2 34 for transmission, the two worm gears 2 34 are movably connected with L-shaped plates 35 at the positions relatively far from the side light rods, the relatively far ends of the two L-shaped plates 35 are respectively fixedly connected with the relatively close ends of the two vertical plates 31 at the rear side, and the two worm gears 2 34 are connected with the rotating sleeves with two guide grooves opened inside through the two guide blocks arranged at the relatively close ends thereof. The tube 11 is movably connected, and the front and rear ends of the four fixing rods 2 33 are sleeved with springs 32. The rotating sleeve 11 is rotated to drive the two worm gears 2 34 to rotate, and then the two internal threaded sleeves 36 can be driven to rotate under the action of the two worm gears 2 37. The rotation of the two internal threaded sleeves 36 can drive the two rear tightening plates 310 to move backward under the action of the two threaded rods 2 38. In this process, the two front tightening plates 310 can be driven to move forward under the action of the connecting rope 312, the bolt block 311, the concave guide rod 313 and the spring 32. When the corresponding two tightening plates 310 are relatively far away from each other, the two mounting plates 1 4 can be conveniently removed from the two mounting plates 2 6.Thus, the disassembly process of the two pipe bodies 2 is achieved.

[0032] The operating steps of the utility model are:

[0033] When the device is used up and the two pipe bodies 2 need to be removed from the device, the worm 96 is rotated to drive the two threaded rods 94 to rotate under the action of the worm wheel 93. The rotation of the two threaded rods 94 can drive the two left tightening plates 310 and the two right tightening plates 310 to move away from each other under the action of the fixed rod 95, the vertical plate 2 39 and the vertical plate 31. At this time, the four tightening plates 310 no longer tighten the two mounting plates 4. Then, the rotating sleeve 11 is rotated to drive the two worms 34 to rotate, and then the two worm wheels 37, the internal threaded sleeve 36 and the internal threaded sleeve 37 are rotated. The two rear tightening plates 310 are driven to move backwards by the action of the threaded rod 38. At this time, the two front tightening plates 310 are driven to move forwards by the action of the connecting rope 312, the bolt block 311, the concave guide rod 313 and the spring 32. When the two corresponding tightening plates 310 on the front and rear sides move away from each other to a certain distance, the tightening plates 310 no longer block the mounting plate 4. Then, the two mounting plates 4 are driven to move away from each other until the eight limiting rods 5 are respectively moved out of the four limiting holes opened in the two mounting plates 2 6. At this time, the disassembly process of the two pipe bodies 2 can be completed.

[0034] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A farmland water utilization pipeline connection device, comprising a mounting plate (1), characterized in that: The upper end of the mounting plate (1) is fixedly connected to a transmission mechanism (9), and the left and right sides of the transmission mechanism (9) are both provided with adjustable tightening mechanisms (3). The relatively close sides of the two adjustable tightening mechanisms (3) are respectively overlapped with the relatively far ends of the two mounting plates (4). The two mounting plates (4) are respectively fixedly connected to the relatively close ends of the two pipe bodies (2). The relatively close ends of the two pipe bodies (2) are respectively overlapped with the left and right ends of the connecting pipe (7). The left and right ends of the connecting pipe (7) are both fixedly connected to mounting plates (6). The two mounting plates (6) are respectively overlapped with the relatively close ends of the two mounting plates (4) through waterproof pads provided at their relatively far ends. The relatively close ends of the two adjustable tightening mechanisms (3) are movably connected to a rotating sleeve (11) having two guide grooves provided therein.

2. The farmland water utilization pipeline connection device according to claim 1, characterized in that: The left and right sides of the rotating sleeve (11) are movably connected to support plates 1 (10), and the lower ends of the two support plates 1 (10) are fixedly connected to the upper end of the mounting plate (1). The left and right sides of the connecting tube (7) are fixedly connected to support plates 2 (8), and the lower ends of the two support plates 2 (8) are fixedly connected to the upper end of the mounting plate (1).

3. The farmland water utilization pipeline connection device according to claim 1, characterized in that: The two mounting plates (2) (6) are movably connected to the eight limiting rods (5) through four limiting holes provided therein, and the eight limiting rods (5) are divided into two groups of four, and their relatively far ends are fixedly connected to the relatively close ends of the two mounting plates (4).

4. The farmland water utilization pipeline connection device according to claim 1, characterized in that: The transmission mechanism (9) comprises two support plates (91), the lower ends of the two support plates (91) are fixedly connected to the upper end of the mounting plate (1), the two support plates (91) are movably connected to the front and rear sides of a worm (96) through connection holes provided inside the upper ends thereof, the worm (96) is meshed with two worm wheels (93) for transmission, and the two worm wheels (93) are fixedly connected to the right ends of two threaded rods (94) respectively.

5. The farmland water utilization pipeline connection device according to claim 4, characterized in that: The left and right sides of the two threaded rods (94) are movably connected to a vertical plate (92); the lower ends of the four vertical plates (92) are fixedly connected to the upper end of the mounting plate (1); the two threaded rods (94) are respectively threadedly connected to the front and rear sides of the two adjustable tightening mechanisms (3); the four vertical plates (92) are grouped in pairs, and their relatively close ends are respectively fixedly connected to the left and right ends of four fixed rods (95); the four fixed rods (95) are grouped in pairs and are respectively movably connected to the front and rear sides of the two adjustable tightening mechanisms (3).

6. The farmland water utilization pipeline connection device according to claim 5, characterized in that: The two adjustable tightening mechanisms (3) each include two vertical plates (39), the four vertical plates (39) are grouped in pairs and are all threadedly connected to two threaded rods (94) through threaded holes opened inside the vertical plates, and the four vertical plates (39) are grouped in pairs and are all movably connected to four fixed rods (95) through two circular holes opened inside the vertical plates.

7. The farmland water utilization pipeline connection device according to claim 6, characterized in that: The four vertical plates (39) are arranged in groups of two, and their relatively close ends are fixedly connected to the vertical plates (31); the four vertical plates (31) are arranged in groups of two, and their relatively close ends are respectively fixedly connected to the front and rear ends of the four fixing rods (33); the four fixing rods (33) are arranged in groups of two, and are respectively movably connected to four top tightening plates (310) with circular holes provided inside at both upper and lower ends; the four top tightening plates (310) are arranged in groups of two, and their relatively close ends are respectively overlapped with the relatively far ends of the two mounting plates (4).

8. The farmland water utilization pipeline connection device according to claim 7, characterized in that: The rear ends of the two rear tightening plates (310) are fixedly connected to two connecting ropes (312), the front ends of the four connecting ropes (312) respectively pass around four concave guide rods (313) and are fixedly connected to four bolting blocks (311), the four bolting blocks (311) are grouped in pairs, and their relatively close ends are respectively fixedly connected to the relatively far ends of the two front tightening plates (310), and the four concave guide rods (313) are grouped in pairs, and their rear ends are respectively fixedly connected to the front ends of the two rear vertical plates (31).

9. The farmland water utilization pipeline connection device according to claim 8, characterized in that: The two vertical plates (31) at the rear side are movably connected to the two internally threaded sleeves (36) through the connection holes provided therein, the two internally threaded sleeves (36) are respectively threadedly connected to the two threaded rods (38), the front ends of the two threaded rods (38) are respectively fixedly connected to the rear ends of the two rear tightening plates (310), the rear sides of the two internally threaded sleeves (36) are fixedly connected to worm gears (37), the two worm gears (37) are respectively meshed with the two worm gears (34) for transmission.

10. The farmland water utilization pipeline connection device according to claim 9, characterized in that: The two worm gears (34) are movably connected to an L-shaped plate (35) at a position relatively far from the side light rod. The relatively far ends of the two L-shaped plates (35) are respectively fixedly connected to the relatively close ends of the two rear vertical plates (31). The two worm gears (34) are movably connected to a rotating sleeve (11) with two guide grooves provided inside through two guide blocks provided at their relatively close ends. The front and rear ends of the four fixed rods (33) are sleeved with springs (32).

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