Sludge cleaning device for land utilization and ecological restoration

Abstract

The invention discloses a land utilization and ecological restoration sludge cleaning device which comprises a top seat, an assembly hole is formed in the center of the top seat, stand columns are connected to the four corners of the bottom of the top seat, a bearing shell is jointly connected among the four stand columns, a vertical frame is connected to the top of the bearing shell, a treatment box is connected between the vertical frame and the assembly hole, and a dewatering cylinder is arranged in the treatment box. A conveying shell penetrates through the front side of the box wall of the treatment box, a sludge discharging opening is formed in the front side of the bottom wall of the conveying shell, a sludge inlet is formed in the rear side of the top wall of the conveying shell, and a second electromagnetic valve is installed in the sludge inlet; the upper end of the sludge inlet is rotationally connected with a discharging pipe; the sludge dewatering device is reasonable in structural design, the position of the sludge pump can be conveniently adjusted to suck and clean sludge, impurities attached to the inner wall of the dewatering cylinder can be cleaned, and water filtering holes are prevented from being blocked.

Description

Technical Field

[0001] The invention relates to the technical field of sewage sludge discharge, and in particular to a sludge cleaning device for land utilization and ecological restoration. Background Art

[0002] Land use is the economic activity process in which human beings obtain material products and services by combining with land. In this process, human beings exchange and transform matter, energy, value and information with land. Land use is a technical issue. It is the utilization of a complex of various natural factors such as air, soil, water, topography, and organisms. Ecological restoration is a comprehensive method of repairing polluted environment under the guidance of ecological principles, based on biological restoration, combined with various physical restoration, chemical restoration and engineering technical measures, through optimized combination to achieve the best effect and lowest cost.

[0003] To this end, technicians in the relevant technical field have made improvements, such as the "Sludge Cleaning Device for Land Utilization and Ecological Restoration" proposed in Chinese Patent Application No. CN202420099407.3. In this application document, the sludge is pumped away by a sludge suction pump, and then the sludge is stored in a collection box through a conveying hose and a sludge discharge pipe, which can meet the sludge cleaning needs of small ditches or small ponds. However, the technical solution in this application document is still insufficient. The sludge often carries a large amount of water, and direct extraction and discharge wastes water resources. The sludge extraction position is not easy to adjust, which affects the overall cleaning effect. To this end, we propose a sludge cleaning device for land utilization and ecological restoration. Summary of the invention

[0004] The purpose of the present invention is to provide a sludge cleaning device for land utilization and ecological restoration to overcome the technical problems existing in the prior art.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention provides the following technical solutions:

[0006] A sludge cleaning device for land utilization and ecological restoration comprises a top seat, a mounting hole is provided in the center of the top seat, four corners of the bottom of the top seat are connected with columns, a receiving shell is commonly connected between the four columns, a stand is connected to the top of the receiving shell, a treatment box is connected between the stand and the mounting hole, a dewatering cylinder is built into the treatment box, a PLC controller is connected to the outer wall of the receiving shell, a drain pipe is connected to the lower end of the treatment box, a solenoid valve 1 is installed at one end of the drain pipe passing through the receiving shell, a conveying shell is passed through the front side of the box wall of the treatment box, a mud discharge port is provided on the front side of the bottom wall of the conveying shell, a mud inlet is provided on the rear side of the top wall of the conveying shell, a solenoid valve 2 is installed in the mud inlet, and a discharge pipe is rotatably connected to the upper end of the mud inlet.

[0007] Preferably, in a sludge cleaning device for land utilization and ecological restoration, two threaded rods are symmetrically rotatably connected on the left and right sides of the inner cavity of the receiving shell, the front side of the outer wall of the threaded rod is connected with a bevel gear ring, the front side of the inner cavity of the receiving shell is connected with a bearing seat, a transmission shaft is rotatably connected in the bearing seat, the end of the transmission shaft is connected with a bevel gear, the bevel gear is meshed with a bevel gear ring, the middle part of the outer wall of the transmission shaft is connected with a worm gear, the front end of the receiving shell is connected with a worm motor, the output end of the worm motor is connected with a worm, the worm is meshed with the worm gear, and the rear end of the receiving shell is movably connected with a U-shaped arm, and the open end of the U-shaped arm is provided with a threaded hole matching the threaded rod.

[0008] Preferably, in a sludge cleaning device for land utilization and ecological restoration, the bottom wall of the horizontal part of the U-shaped arm is connected to an electric push rod, the lower end of the electric push rod is connected to a fixed frame, a mud pump is connected inside the fixed frame, and a bellows is connected between the output end of the mud pump and the U-shaped arm.

[0009] Preferably, in a sludge cleaning device for land utilization and ecological restoration, a plurality of water filtering holes are opened on the side wall of the dewatering cylinder, the upper end of the dewatering cylinder is connected to a cylinder cover, the center of the cylinder cover is rotatably connected to a joint pipe, an L-shaped pipe is connected between the joint pipe and the top seat, a material guiding hose is connected between the vertical end of the L-shaped pipe and the corrugated pipe, a bevel gear ring 2 is connected to the upper part of the outer wall of the dewatering cylinder, and the lower end of the dewatering cylinder is connected to a discharge pipe.

[0010] Preferably, in a sludge cleaning device for land utilization and ecological restoration, a steering motor is connected to the top of the inner wall of the treatment box, the output end of the steering motor is connected to bevel gear 2, and bevel gear 2 is meshingly connected to bevel gear ring 2, and the inner wall of the treatment box is circumferentially connected to a plurality of limit rods, and the ends of the plurality of limit rods are commonly connected to an annular seat, and an annular slide is provided on the side of the annular seat close to the dehydration cylinder, and a plurality of rolling steel balls are installed in the annular slide, and the rolling steel balls abut the outer wall of the dehydration cylinder.

[0011] Preferably, in a sludge cleaning device for land utilization and ecological restoration, a fixed arm is connected to the top front side of the top seat, a hydraulic rod is connected to the top of the inner wall of the fixed arm, a vertical rod is connected to the movable end of the hydraulic rod, one end of the vertical rod extending into the dewatering cylinder is connected to a plurality of fixed rods, the ends of the plurality of fixed rods are commonly connected to an annular scraper, the inner diameter of the upper part of the dewatering cylinder is larger than the outer diameter of the annular scraper, a clearance opening for the vertical rod to pass through is opened on the joint pipe, a sealing ring is connected to the inner wall of the clearance opening, and the discharge pipe, dewatering cylinder, annular seat and annular scraper are arranged coaxially.

[0012] Preferably, in a sludge cleaning device for land utilization and ecological restoration, the conveying shell is located at a height between the receiving shell and the dewatering cylinder, the front end of the conveying shell is connected to a conveying motor, the output end of the conveying motor is connected to a conveying shaft, and the outer wall of the conveying shaft is connected to a spiral auger.

[0013] Preferably, in a sludge cleaning device for land utilization and ecological restoration, the lower portion of the outer wall of the column is connected to a wheel axle, the end of the wheel axle is rotatably connected to a walking wheel, a accommodating cavity is provided in the lower portion of the column, the cavity wall of the accommodating cavity is provided with a J-shaped groove, a plug rod is movably inserted at the lower end of the accommodating cavity, a positioning pin passes through the upper portion of the outer wall of the plug rod, the end of the positioning pin extends out of the J-shaped groove, and a reset spring is connected between the positioning pin and the bottom wall of the accommodating cavity.

[0014] The beneficial effects of the present invention are:

[0015] 1. The structure of the present invention is reasonably designed, and the overall movement is convenient. The positioning pin can be pressed down and screwed into the tail of the J-shaped groove, which is convenient for the insertion rod to be inserted into the ground for limit fixing, ensuring the stable sludge cleaning work. The worm motor, worm, worm wheel, transmission shaft, bevel gear one, bevel gear ring one and threaded rod are used for transmission, so that the U-shaped arm can move out of the receiving shell. When the electric push rod drives the fixed frame to descend, the bellows is unfolded, which is convenient for adjusting the position of the mud pump to suck and clean the sludge;

[0016] 2. In the present invention, the bevel gear meshes with the bevel gear ring 2 to drive the dewatering cylinder to rotate at high speed around its own axis, so that the water in the sludge can be thrown out from the water filter hole, and the sludge is retained in the dewatering cylinder. The dewatered sludge can enter the conveying shell along the discharge pipe. After the conveying shaft rotates, the spiral auger delivers the sludge, and the vertical rod is driven down by the hydraulic rod. The height of the fixed rod and the annular scraper is lowered, which can clean the impurities attached to the inner wall of the dewatering cylinder and avoid clogging of the water filter hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0019] Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0020] Figure 3 It is a schematic diagram of the top view of the threaded rod in the present invention;

[0021] Figure 4 It is a schematic diagram of the internal structure of the processing box in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the annular seat in the present invention;

[0023] Figure 6 It is a structural schematic diagram of the middle column of the present invention.

[0024] In the figure: 1, top seat; 2, assembly hole; 3, column; 4, receiving shell; 5, stand; 6, processing box; 7, dewatering cylinder; 8, PLC controller; 9, drain pipe; 10, solenoid valve 1; 11, conveying shell; 12, mud discharge port; 13, mud inlet; 14, solenoid valve 2; 15, discharge pipe; 21, fixed arm; 22, hydraulic rod; 23, vertical rod; 24, fixed rod; 25, annular scraper; 26, give way; 31, wheel axle; 32, walking wheel; 33, accommodating cavity; 34, J-shaped groove; 35, plug rod; 36, positioning pin; 37, reset spring; 40, threaded hole; 41, thread rod; 42, bevel gear ring 1; 43, bearing seat; 44, transmission shaft; 45, bevel gear 1; 46, worm wheel; 47, worm motor; 48, worm; 49, U-shaped arm; 61, steering motor; 62, bevel gear 2; 63, limit rod; 64, annular seat; 65, annular slideway; 66, rolling steel ball; 71, water filter hole; 72, cylinder cover; 73, joint pipe; 74, L-shaped pipe; 75, bevel gear ring 2; 76, material guide hose; 91, electric push rod; 92, fixed frame; 93, mud pump; 94, bellows; 111, conveying motor; 112, conveying shaft; 113, spiral auger. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1

[0027] See also Figure 1-6As shown, this embodiment is a sludge cleaning device for land utilization and ecological restoration, including a top seat 1, a mounting hole 2 is opened in the center of the top seat 1, columns 3 are connected to the four corners of the bottom of the top seat 1, a receiving shell 4 is commonly connected between the four columns 3, a stand 5 is connected to the top of the receiving shell 4, a processing box 6 is connected between the stand 5 and the mounting hole 2, a dewatering cylinder 7 is built into the processing box 6, a PLC controller 8 is connected to the outer wall of the receiving shell 4, a drain pipe 9 is connected to the lower end of the processing box 6, a solenoid valve 10 is installed at one end of the drain pipe 9 penetrating through the receiving shell 4, a conveying shell 11 is penetrated on the front side of the box wall of the processing box 6, a mud discharge port 12 is opened on the front side of the bottom wall of the conveying shell 11, a mud inlet 13 is opened on the rear side of the top wall of the conveying shell 11, a solenoid valve 14 is installed in the mud inlet 13, and a discharge pipe 15 is rotatably connected to the upper end of the mud inlet 13.

[0028] Two threaded rods 41 are symmetrically rotatably connected to the left and right sides of the inner cavity of the receiving shell 4, the front side of the outer wall of the threaded rod 41 is connected to a bevel gear ring 42, the front side of the inner cavity of the receiving shell 4 is connected to a bearing seat 43, a transmission shaft 44 is rotatably connected in the bearing seat 43, the end of the transmission shaft 44 is connected to a bevel gear 45, the bevel gear 45 is meshed with the bevel gear ring 42, the middle part of the outer wall of the transmission shaft 44 is connected to a worm gear 46, the front end of the receiving shell 4 is connected to a worm motor 47, the output end of the worm motor 47 is connected to a worm 48, the worm 48 is meshed with the worm gear 46, and the rear end of the receiving shell 4 is movably connected with a U-shaped arm 49, and the open end of the U-shaped arm 49 is provided with a threaded hole 40 matching the threaded rod 41.

[0029] The bottom wall of the horizontal part of the U-shaped arm 49 is connected to an electric push rod 91 , the lower end of the electric push rod 91 is connected to a fixed frame 92 , a mud pump 93 is connected inside the fixed frame 92 , and a bellows 94 is connected between the output end of the mud pump 93 and the U-shaped arm 49 .

[0030] A wheel axle 31 is connected to the lower part of the outer wall of the column 3, and a walking wheel 32 is rotatably connected to the end of the wheel axle 31. A receiving chamber 33 is provided in the lower part of the column 3, and a J-shaped groove 34 is opened on the cavity wall of the receiving chamber 33. A plug rod 35 is movably inserted at the lower end of the receiving chamber 33. A positioning pin 36 passes through the upper part of the outer wall of the plug rod 35, and the end of the positioning pin 36 extends out of the J-shaped groove 34. A return spring 37 is connected between the positioning pin 36 and the bottom wall of the receiving chamber 33.

[0031] The specific implementation of the present invention is:

[0032] When the device is in use, an external power source is connected, and the device is moved to the working area through the walking wheel 32. The positioning pin 36 is pressed down and screwed into the tail of the J-shaped groove 34. The insertion rod 35 can be inserted into the ground for limit fixing to ensure the stable progress of the sludge cleaning work. The worm 48 is driven to rotate by the worm motor 47. The worm 48 engages with the transmission worm wheel 46, so that the transmission shaft 44 drives the bevel gear 45 to rotate. The bevel gear 45 engages with the transmission bevel gear ring 42, so that the two threaded rods 41 rotate synchronously, and the U-shaped arm 49 can move out of the receiving shell 4. The electric push rod 91 is used to drive the fixed frame 92 to descend, so as to facilitate the adjustment of the position of the mud pump 93. The bellows 94 is unfolded and the mud pump 93 falls into the sludge area at the same time, so as to facilitate the suction and cleaning of the sludge.

[0033] Embodiment 2

[0034] On the basis of Example 1, a plurality of water filtering holes 71 are provided on the side wall of the dehydration cylinder 7, a cylinder cover 72 is connected to the upper end of the dehydration cylinder 7, a joint pipe 73 is rotatably connected to the center of the cylinder cover 72, an L-shaped pipe 74 is connected between the joint pipe 73 and the top seat 1, a material guiding hose 76 is connected between the vertical end of the L-shaped pipe 74 and the corrugated pipe 94, a bevel gear ring 2 75 is connected to the upper part of the outer wall of the dehydration cylinder 7, and the lower end of the dehydration cylinder 7 is connected to the discharge pipe 15.

[0035] A steering motor 61 is connected to the top of the inner wall of the processing box 6, and a bevel gear 2 62 is connected to the output end of the steering motor 61. The bevel gear 2 62 is meshed with the bevel gear ring 2 75. A plurality of limit rods 63 are circumferentially connected to the inner wall of the processing box 6, and the ends of the plurality of limit rods 63 are commonly connected to an annular seat 64. An annular slide 65 is provided on the side of the annular seat 64 close to the dehydration cylinder 7, and a plurality of rolling steel balls 66 are installed in the annular slide 65, and the rolling steel balls 66 abut against the outer wall of the dehydration cylinder 7.

[0036] A fixed arm 21 is connected to the front side of the top of the top seat 1, a hydraulic rod 22 is connected to the top of the inner wall of the fixed arm 21, a vertical rod 23 is connected to the movable end of the hydraulic rod 22, and one end of the vertical rod 23 extending into the dehydration cylinder 7 is connected to multiple fixed rods 24, and the ends of the multiple fixed rods 24 are commonly connected to an annular scraper 25. The inner diameter of the upper part of the dehydration cylinder 7 is larger than the outer diameter of the annular scraper 25. A clearance opening 26 for the vertical rod 23 to pass through is opened on the joint pipe 73, and a sealing ring is connected to the inner wall of the clearance opening 26. The discharge pipe 15, the dehydration cylinder 7, the annular seat 64 and the annular scraper 25 are arranged coaxially.

[0037] The conveying shell 11 is located at a height between the receiving shell 4 and the dehydration cylinder 7 . A conveying motor 111 is connected to the front end of the conveying shell 11 . A conveying shaft 112 is connected to the output end of the conveying motor 111 . A spiral auger 113 is connected to the outer wall of the conveying shaft 112 .

[0038] The specific implementation of the present invention is:

[0039] In this embodiment, the sludge enters the guide hose 76 along the bellows 94, and falls into the dewatering cylinder 7 after passing through the L-shaped tube 74 and the joint tube 73. The bevel gear 62 is driven to rotate by the steering motor 61, and the bevel gear 62 is meshed with the transmission bevel gear ring 75, so that the dewatering cylinder 7 rotates at a high speed around its own axis. The water in the sludge is thrown out from the water filter hole 71, and the water accumulates in the lower part of the inner cavity of the processing box 6. After the solenoid valve 10 is opened, it is discharged from the drain pipe 9. The sludge is retained in the dewatering cylinder 7. The solenoid valve 14 is opened regularly, and the dehydrated sludge can be discharged along the discharge pipe 15. The conveying shaft 112 is driven to rotate by the conveying motor 111, and the spiral auger 113 can push the sludge forward and send it out from the sludge discharge port 12. The inner diameter of the upper part of the dewatering cylinder 7 is larger than the outer diameter of the annular scraper 25. The annular scraper 25 does not hinder the operation of the dewatering cylinder 7 when idle. The vertical rod 23 is driven down by the hydraulic rod 22, and the height of the fixed rod 24 and the annular scraper 25 is lowered, which can clean the impurities attached to the inner wall of the dewatering cylinder 7 to avoid clogging of the water filter hole 71. The sealing effect of the give-way 26 is improved by the sealing ring to avoid sludge splashing.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0041] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sludge cleaning device for land utilization and ecological restoration, comprising a top seat (1), characterized in that: The center of the top seat (1) is provided with an assembly hole (2); the four corners of the bottom of the top seat (1) are connected with upright posts (3); a receiving shell (4) is commonly connected between the four upright posts (3); a stand (5) is connected to the top of the receiving shell (4); a processing box (6) is connected between the stand (5) and the assembly hole (2); a dehydration cylinder (7) is built into the processing box (6); a PLC controller (8) is connected to the outer wall of the receiving shell (4); The lower end is connected with a drainage pipe (9), and one end of the drainage pipe (9) passing through the receiving shell (4) is installed with a solenoid valve (10). The front side of the box wall of the processing box (6) passes through a conveying shell (11), and the front side of the bottom wall of the conveying shell (11) is provided with a mud discharge port (12). The rear side of the top wall of the conveying shell (11) is provided with a mud inlet (13), and the mud inlet (13) is installed with a solenoid valve (14). The upper end of the mud inlet (13) is rotatably connected with a discharge pipe (15).

2. The sludge cleaning device for land utilization and ecological restoration according to claim 1 is characterized by: Two threaded rods (41) are symmetrically rotatably connected to the left and right sides of the inner cavity of the receiving shell (4); the front side of the outer wall of the threaded rod (41) is connected to a bevel gear ring (42); the front side of the inner cavity of the receiving shell (4) is connected to a bearing seat (43); a transmission shaft (44) is rotatably connected in the bearing seat (43); the end of the transmission shaft (44) is connected to a bevel gear (45); the bevel gear (45) is meshingly connected to the bevel gear ring (42); the middle part of the outer wall of the transmission shaft (44) is connected to a worm gear (46); the front end of the receiving shell (4) is connected to a worm motor (47); the output end of the worm motor (47) is connected to a worm (48); the worm (48) is meshingly connected to the worm gear (46); the rear end of the receiving shell (4) is movably plugged with a U-shaped arm (49); the open end of the U-shaped arm (49) is provided with a threaded hole (40) matching the threaded rod (41).

3. The sludge cleaning device for land utilization and ecological restoration according to claim 2 is characterized in that: The bottom wall of the horizontal portion of the U-shaped arm (49) is connected to an electric push rod (91), the lower end of the electric push rod (91) is connected to a fixed frame (92), a mud pump (93) is connected inside the fixed frame (92), and a bellows (94) is connected between the output end of the mud pump (93) and the U-shaped arm (49).

4. The sludge cleaning device for land utilization and ecological restoration according to claim 3 is characterized by: The side wall of the dehydration cylinder (7) is provided with a plurality of water filtering holes (71); the upper end of the dehydration cylinder (7) is connected to a cylinder cover (72); the center of the cylinder cover (72) is rotatably connected to a joint pipe (73); an L-shaped pipe (74) is connected between the joint pipe (73) and the top seat (1); a material guiding hose (76) is connected between the vertical end of the L-shaped pipe (74) and the corrugated pipe (94); the upper part of the outer wall of the dehydration cylinder (7) is connected to a second bevel gear ring (75); and the lower end of the dehydration cylinder (7) is connected to a discharge pipe (15).

5. The sludge cleaning device for land utilization and ecological restoration according to claim 4 is characterized in that: The top of the inner wall of the processing box (6) is connected to a steering motor (61), the output end of the steering motor (61) is connected to a second bevel gear (62), the second bevel gear (62) is meshingly connected to a second bevel gear ring (75), the inner wall of the processing box (6) is circumferentially connected to a plurality of limit rods (63), the ends of the plurality of limit rods (63) are commonly connected to an annular seat (64), an annular slideway (65) is provided on a side of the annular seat (64) close to the dehydration cylinder (7), a plurality of rolling steel balls (66) are installed in the annular slideway (65), and the rolling steel balls (66) abut against the outer wall of the dehydration cylinder (7).

6. The sludge cleaning device for land utilization and ecological restoration according to claim 5 is characterized by: The top front side of the top seat (1) is connected to a fixed arm (21), the inner wall top of the fixed arm (21) is connected to a hydraulic rod (22), the movable end of the hydraulic rod (22) is connected to a vertical rod (23), one end of the vertical rod (23) extending into the dehydration cylinder (7) is connected to a plurality of fixed rods (24), the ends of the plurality of fixed rods (24) are commonly connected to an annular scraper (25), the inner diameter of the upper portion of the dehydration cylinder (7) is larger than the outer diameter of the annular scraper (25), a clearance opening (26) for the vertical rod (23) to pass through is provided on the joint pipe (73), the inner wall of the clearance opening (26) is connected to a sealing ring, and the discharge pipe (15), the dehydration cylinder (7), the annular seat (64) and the annular scraper (25) are arranged coaxially.

7. The sludge cleaning device for land utilization and ecological restoration according to claim 1 is characterized by: The conveying shell (11) is located at a height between the receiving shell (4) and the dehydration cylinder (7); the front end of the conveying shell (11) is connected to a conveying motor (111); the output end of the conveying motor (111) is connected to a conveying shaft (112); and the outer wall of the conveying shaft (112) is connected to a spiral auger (113).

8. The sludge cleaning device for land utilization and ecological restoration according to claim 1 is characterized by: The lower part of the outer wall of the column (3) is connected to a wheel axle (31), and the end of the wheel axle (31) is rotatably connected to a walking wheel (32). A receiving chamber (33) is provided in the lower part of the column (3), and a J-shaped groove (34) is provided on the wall of the receiving chamber (33). A plug rod (35) is movably inserted at the lower end of the receiving chamber (33). A positioning pin (36) passes through the upper part of the outer wall of the plug rod (35), and the end of the positioning pin (36) extends out of the J-shaped groove (34). A return spring (37) is connected between the positioning pin (36) and the bottom wall of the receiving chamber (33).

Images