Cleaning device for casting part machining

Abstract

The cleaning device comprises a water storage tank and a main body mechanism, the inner wall surface of the upper end of the main body mechanism is in threaded connection with a spraying device, the inner wall surface of the lower end of the main body mechanism is movably connected with a waste water collecting box, and the upper end in the waste water collecting box is movably connected with a filter screen; a bearing table is movably connected to the bottom end surface in the wastewater collecting box, a limiting mechanism is movably connected to the middle position in the main body mechanism, a cleaning mechanism is movably connected to the upper end of the limiting mechanism, and the main body mechanism is in threaded connection to the lower end surface of the water storage tank. According to the casting part cleaning device, the threaded rod, the metal plate and the hexagon nut are arranged, different types of cleaning sponges can be used according to the shape and the material of a casting part, scraps at gaps of the casting part can be cleaned, secondary cleaning of the casting part is not needed, and the cleaning efficiency is improved. The cleaning device has the advantages that practicability is high, the second metal plate and the first metal sliding rod can be fixed in an inserted mode, and the position of the cleaning sponge can be limited and fixed.

Description

Technical Field

[0001] The invention relates to the technical field of PE pipes, in particular to a cleaning device for casting processing. Background Art

[0002] Existing castings are made by heating and melting a metal block to form liquid metal, which is then poured into a casting cavity with a shape and size that matches the part. The blank or part is called a casting and is cooled and solidified to obtain a blank. After the casting is processed, it needs to be cleaned.

[0003] The prior art discloses a casting cleaning device with application number: CN202222260096.8, which aims to solve the problem of wasting water resources. The key points of its technical solution are: a casting cleaning device for casting, including a cleaning box, a water tank is fixedly installed on the middle side of the upper end of the cleaning box, a water inlet hole is opened at the upper end of the water tank, the lower end of the water tank penetrates the top of the cleaning box and is fixedly installed with a nozzle, a support plate is fixedly installed in the middle of the inner cavity of the cleaning box, a casting workpiece is placed on the upper end of the support plate, a through groove is opened on the rear wall of the inner cavity of the cleaning box, a sliding device is provided in the middle of the rear end of the cleaning box, a cleaning sponge is fixedly installed at the lower end of the sliding device, a storage box is fixedly installed at the bottom of the inner cavity of the cleaning box, a filtering device is provided inside the storage box, and a circulation pipe is fixedly installed at the rear end of the storage box. The water in the storage box of this application passes through the circulation pipe and flows back to the water tank, and does not need to be discharged to the external environment, which protects the environment, reuses water resources, and reduces the cost of water resource cleaning.

[0004] The casting is washed and cleaned by spraying water through a nozzle. However, since there are debris inside the gap of the casting, the nozzle cannot flush there, resulting in debris remaining inside the casting, so the casting needs to be cleaned twice, which takes a lot of time to clean. Therefore, it is necessary to design a cleaning device for casting processing that is practical and convenient for cleaning the chips at the gaps of the castings. Summary of the invention

[0005] The object of the present invention is to provide a cleaning device for casting processing to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a cleaning device for casting processing, comprising a water storage tank and a main body mechanism, wherein the inner wall surface of the upper end of the main body mechanism is threadedly connected with a spray device, the inner wall surface of the lower end of the main body mechanism is movably connected with a wastewater collection box, the upper end of the wastewater collection box is movably connected with a filter screen, the bottom end surface of the wastewater collection box is movably connected with a supporting platform, the middle position of the main body mechanism is movably connected with a limiting mechanism, the upper end of the limiting mechanism is movably connected with a cleaning mechanism, and the main body mechanism is threadedly connected to the lower end surface of the storage water tank.

[0007] The cleaning mechanism comprises a sliding unit and a cleaning unit, and the sliding unit and the cleaning unit are arranged in sequence from top to bottom.

[0008] According to the above technical solution, the sliding unit includes a sliding device 1, a limiting rod, a coil spring, a connecting handle and a connecting plate. The connecting handle is located at the upper end of the sliding unit, the connecting handle is fixedly connected to the top surface of the sliding device 1, the sliding device 1 is fixedly connected to the top surface of the coil spring, the sliding device 1 is movably connected to the upper end surface of the limiting rod, and the limiting rod is fixedly connected to the top surface of the connecting plate.

[0009] According to the above technical solution, the cleaning unit includes a cleaning sponge, a metal plate, a threaded rod and a hexagonal nut. The cleaning sponge is located at the lower end of the cleaning unit, the cleaning sponge is movably connected to the bottom end surface of the metal plate, the metal plate is fixedly connected to the bottom end surface of the threaded rod, and the threaded rod is threadedly connected to the inner threaded surface of the hexagonal nut.

[0010] According to the above technical solution, the limiting mechanism includes a metal slide bar 1, a metal latch, a metal plate 2 and a sliding device 2, wherein the sliding device 2 is located at the lower end of the limiting mechanism, the sliding device 2 is fixedly connected to the bottom end surface of the metal plate 2, the metal plate 2 is movably connected to the left end surface of the metal slide bar 1, and the metal plate 2 is movably connected to the left end surface of the metal latch.

[0011] According to the above technical solution, the main body structure includes a cleaning shell, a metal shell, a second metal slide rod and a metal support rod. The metal support rod is located at the upper end of the main body structure, the metal support rod is fixedly connected to the top surface of the cleaning shell, the cleaning shell is fixedly connected to the back side of the second metal slide rod, and the cleaning shell is fixedly connected to the left side surface of the metal shell.

[0012] According to the above technical solution, the cleaning shell is threadedly connected to the bottom surface of the spray device, the cleaning shell is movably connected to the surface of the wastewater collection box, the cleaning shell is located below the storage water tank, the storage water tank is threadedly connected to the upper inner wall surface of the metal support rod, the storage water tank is fixedly connected to the top surface of the spray device, the spray device is started, the spray device draws clean water from the storage water tank, so that the spray device can spray and clean the casting on the supporting platform, and the casting can be preliminarily cleaned.

[0013] According to the above technical solution, the sliding device 2 is movably connected to the surface of the metal slide bar 2, the number of the metal slide bars 2 is three, and the three metal slide bars 2 are evenly spaced. The sliding device 2 is movably connected to the inner wall surface of the metal shell. Holding the left and right end surfaces of the metal slide bar 1 and pulling the metal slide bar 1 to move forward and backward, the metal slide bar 1 drives the metal plate 2 to move forward, and the metal plate 2 drives the surface of the sliding device 2 to slide.

[0014] According to the above technical solution, the number of the metal plates 2 is two, and the two metal plates 2 are movably connected to the left end surface and the right end surface of the metal slide bar 1, the metal slide bar 1 is movably connected to the surface of the metal pin, and the metal slide bar 1 is movably connected to the upper end inner wall surface of the sliding device.

[0015] According to the above technical solution, the limiting rod is fixedly connected to the top surface of the connecting plate, the connecting plate is movably connected to the threaded end surface of the threaded rod, the connecting plate is movably connected to the bottom surface of the hexagonal nut, and the connecting plate is movably connected to the top surface of the metal plate one. By rotating the hexagonal nut, the hexagonal nut rotates on the threaded end surface of the threaded rod, so that the hexagonal nut can threadably fix the connecting plate and the metal plate one, thereby fixing the position of the cleaning sponge.

[0016] According to the above technical solution, there are two filters, which are movably connected to the left and right sides of the upper end of the wastewater collection box, and to the left and right surfaces of the lower end of the supporting platform. The filter is pulled upward to separate from the wastewater collection box, and the filter slides on the lower end surface of the supporting platform, thereby separating from the wastewater collection box and facilitating the cleaning of the surface of the filter.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. The present invention is provided with a threaded rod, a metal plate and a hexagonal nut. The hexagonal nut is rotated so that the hexagonal nut rotates on the threaded end surface of the threaded rod. Different types of cleaning sponges can be used according to the shape and material of the casting. The debris in the gap of the casting can be cleaned, so that the debris can be separated from the casting, the safety of the casting can be protected, and the casting does not need to be cleaned twice, which can increase the service life of the device.

[0018] 2. The present invention is provided with a metal latch, a metal plate 2 and a metal slide bar 1. The metal latch is pushed so that the metal latch is inserted into the upper end of the metal plate 2 and the left and right ends of the metal slide bar 1, thereby the position between the metal plate 2 and the metal slide bar 1 can be inserted and fixed, and the position of the cleaning sponge can be limited and fixed, so that the casting can be cleaned.

[0019] 3. The present invention comprises a sliding device 2, a metal slide bar 2 and a metal plate 2. The sliding device 2 slides on the surface of the metal slide bar 2. At the same time, the metal plate 2 is driven by the sliding device to move forward and backward. The position of the metal plate 2 can be adjusted, thereby adjusting the position of the cleaning sponge. The cleaning of the casting is smoother and faster, and the use time of the device can be increased.

[0020] 4. The present invention is provided with a filter net, a supporting platform and a wastewater collection box. The filter net is pulled upward to separate from the wastewater collection box, and the filter net slides on the lower end surface of the supporting platform, thereby separating the filter net from the wastewater collection box, making it easy to clean the surface of the filter net. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is an overall three-dimensional schematic diagram of the present invention; Figure 2 It is a three-dimensional schematic diagram of the cleaning mechanism and the limiting mechanism of the present invention; Figure 3 It is a three-dimensional schematic diagram of the cleaning mechanism of the present invention; Figure 4 It is a three-dimensional cutaway schematic diagram of the upper end of the limiting mechanism of the present invention; Figure 5 It is a three-dimensional schematic diagram of the main mechanism of the present invention; Figure 6 It is a three-dimensional schematic diagram of the supporting platform, the filter screen and the wastewater collection box of the present invention.

[0022] In the figure: 1. cleaning mechanism; 101. cleaning sponge; 102. sliding device 1; 103. limiting rod; 104. spiral spring; 105. metal plate 1; 106. threaded rod; 107. hexagonal nut; 108. connecting handle; 109. connecting plate; 2. limiting mechanism; 201. metal sliding rod 1; 202. metal latch; 203. metal plate 2; 204. sliding device 2; 3. main mechanism; 301. cleaning shell; 302. metal shell; 303. metal sliding rod 2; 304. metal support rod; 4. supporting platform; 5. filter screen; 6. wastewater collection box; 7. storage tank; 8. spray device. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1-6 , the present invention provides the following technical solutions: Embodiment 1: A cleaning device for casting processing comprises a storage water tank 7 and a main body mechanism 3. The inner wall surface of the upper end of the main body mechanism 3 is threadedly connected with a spray device 8. The inner wall surface of the lower end of the main body mechanism 3 is movably connected with a wastewater collection box 6. The upper end of the wastewater collection box 6 is movably connected with a filter screen 5. The number of the filter screens 5 is two. The two filter screens 5 are movably connected to the left and right sides of the upper end of the wastewater collection box 6. The two filter screens 5 are movably connected to the left and right surfaces of the lower end of the bearing platform 4. The filter screen 5 is pulled upward to separate the filter screen 5 from the wastewater collection box 6, so that the filter screen 5 slides on the lower end surface of the bearing platform 4, thereby separating the filter screen 5 from the wastewater collection box 6, which is convenient for cleaning the surface of the filter screen 5. The bottom end surface of the wastewater collection box 6 is movably connected with the bearing platform 4. The middle position inside the main body mechanism 3 is movably connected with a limiting mechanism 2. The upper end of the limiting mechanism 2 is movably connected with a cleaning mechanism 1. The main body mechanism 3 is threadedly connected to the lower end surface of the storage water tank 7.

[0025] The cleaning mechanism 1 comprises a sliding unit and a cleaning unit, which are arranged in sequence from top to bottom.

[0026] The sliding unit includes a sliding device 102, a limiting rod 103, a coil spring 104, a connecting handle 108 and a connecting plate 109. The connecting handle 108 is located at the upper end of the sliding unit. The connecting handle 108 is fixedly connected to the top surface of the sliding device 102. The sliding device 102 is fixedly connected to the top surface of the coil spring 104. The sliding device 102 is movably connected to the upper end surface of the limiting rod 103. The limiting rod 103 is fixedly connected to the top surface of the connecting plate 109.

[0027] The cleaning unit includes a cleaning sponge 101, a metal plate 105, a threaded rod 106 and a hexagonal nut 107. The cleaning sponge 101 is located at the lower end of the cleaning unit. The cleaning sponge 101 is movably connected to the bottom surface of the metal plate 105. The metal plate 105 is fixedly connected to the bottom surface of the threaded rod 106. The threaded rod 106 is threadedly connected to the internal thread surface of the hexagonal nut 107. The limiting rod 103 is fixedly connected to the top surface of the connecting plate 109. The connecting plate 109 is movably connected to the threaded end surface of the threaded rod 106. The connecting plate 109 is movably connected to the bottom surface of the hexagonal nut 107. The connecting plate 109 is movably connected to the top surface of the metal plate 105. The hexagonal nut 107 is rotated and rotated on the threaded end surface of the threaded rod 106, so that the hexagonal nut 107 can thread the connecting plate 109 and the metal plate 105, thereby fixing the position of the cleaning sponge 101.

[0028] As can be seen from the above, when in use, hold the bottom surface of the cleaning sponge 101 and push the cleaning sponge 101 upward. The cleaning sponge 101 pushes the metal plate 105 to move upward, and the metal plate 105 pushes the threaded rod 106 to move upward. The threaded rod 106 slides on the inner wall surfaces of the four corners of the connecting plate 109, so that the bottom surface of the connecting plate 109 and the top surface of the metal plate 105 are connected, and then the hexagonal nut 107 is turned. The hexagonal nut 107 rotates on the threaded end surface of the threaded rod 106, so that the hexagonal nut 107 can thread the connecting plate 109 and the metal plate 105, thereby fixing the position of the cleaning sponge 101, and then hold the middle position of the connecting handle 108, pull the connecting handle 108, and the connecting handle 108 drives the sliding device 102 to move left and right, so that the sliding device 102 drives the cleaning sponge 101 to move left and right.

[0029] Embodiment 2: On the basis of embodiment 1, the limiting mechanism 2 includes a metal slide bar 201, a metal latch 202, a metal plate 203 and a sliding device 204. The sliding device 204 is located at the lower end of the limiting mechanism 2. The sliding device 204 is fixedly connected to the bottom surface of the metal plate 203. The metal plate 203 is movably connected to the left end surface of the metal slide bar 201. The metal plate 203 is movably connected to the left end surface of the metal latch 202. There are two metal plates 203. The two metal plates 203 are movably connected to the left and right end surfaces of the metal slide bar 201. The metal slide bar 201 is movably connected to the surface of the metal latch 202. The metal slide bar 201 is movably connected to the upper inner wall surface of the sliding device 102.

[0030] As can be seen from the above, when in use, first hold the bottom surface of the metal slide bar 201 and push the metal slide bar 201 upwards. The metal slide bar 201 slides on the inner wall surface of the metal plate 203, so that the left and right ends of the metal slide bar 201 are connected to the inner upper surface of the metal plate 203, and then hold the surface of the metal plug 202 and push the metal plug 202 to move left and right, so that the metal plug 202 is inserted into the upper end of the metal plate 203 and the upper end of the metal slide bar 201, so that the position of the sliding device 102 can be limited and fixed.

[0031] Embodiment three: On the basis of the second embodiment, the main body mechanism 3 includes a cleaning shell 301, a metal shell 302, a metal slide bar 303 and a metal support bar 304. The metal support bar 304 is located at the upper end of the main body mechanism 3. The metal support bar 304 is fixedly connected to the top surface of the cleaning shell 301. The cleaning shell 301 is fixedly connected to the back of the metal slide bar 303. The cleaning shell 301 is threadedly connected to the bottom surface of the spray device 8. The cleaning shell 301 is movably connected to the surface of the wastewater collection box 6. The cleaning shell 301 is located below the storage water tank 7. The storage water tank 7 is threadedly connected to the upper inner wall surface of the metal support bar 304. The storage water tank 7 is fixedly connected to the top surface of the spray device 8. The spray device 8 is started and sprayed. The shower device 8 draws clean water from the storage tank 7, so that the shower device 8 can spray and clean the castings on the supporting platform 4, and can preliminarily clean the castings. The cleaning shell 301 is fixedly connected to the left surface of the metal shell 302, and the sliding device 204 is movably connected to the surface of the metal slide bar 2 303. The number of metal slide bars 2 303 is three, and the three metal slide bars 2 303 are evenly spaced. The sliding device 204 is movably connected to the inner wall surface of the metal shell 302. Hold the left and right end surfaces of the metal slide bar 1 201, pull the metal slide bar 1 201 to move forward and backward, and the metal slide bar 1 201 drives the metal plate 203 to move forward, and the metal plate 203 drives the surface of the sliding device 204 to slide.

[0032] As can be seen from the above, when in use, hold the left and right end surfaces of the metal slide bar 201 and pull the metal slide bar 201 to move forward and backward. The metal slide bar 201 drives the metal plate 203 to move forward. The metal plate 203 drives the surface of the sliding device 204 to slide. The sliding device 204 slides on the surface of the metal slide bar 201. At the same time, the sliding device 204 slides on the inner wall surface of the metal shell 302, thereby being able to adjust the position of the cleaning sponge 101.

[0033] In summary, when the device is in use, the bottom surface of the cleaning sponge 101 is held, and the cleaning sponge 101 is pushed upward, and the cleaning sponge 101 pushes the metal plate 105 to move upward, and the metal plate 105 pushes the threaded rod 106 to move upward, and the threaded rod 106 slides on the inner wall surfaces of the four corners of the connecting plate 109, so that the bottom surface of the connecting plate 109 and the top surface of the metal plate 105 are connected, and then the hexagonal nut 107 is turned, and the hexagonal nut 107 rotates on the threaded end surface of the threaded rod 106, so that the hexagonal nut 107 can thread the connecting plate 109 and the metal plate 105, so that The cleaning sponge 101 is fixed in position, and then the middle position of the connecting handle 108 is held, and the connecting handle 108 is pulled, and the connecting handle 108 drives the sliding device 102 to move left and right, and the sliding device 102 drives the cleaning sponge 101 to move left and right, and then the upper end of the filter 5 is held, and the filter 5 is pushed to move left and right, so that the filter 5 moves left and right, and the inner wall surface of the filter 5 is connected to the lower end surface of the supporting platform 4, and then the filter 5 is pushed downward, so that the filter 5 slides on the lower end surface of the supporting platform 4, and the filter 5 is inserted into the upper end of the wastewater collection box 6, and then the upper end of the casting is held, and the casting is The bottom surface of the casting is connected to the top surface of the carrier 4, and the spray device 8 is started at this time. The spray device 8 draws clean water from the storage tank 7 so that the spray device 8 can spray and clean the casting on the carrier 4, and the casting can be preliminarily cleaned. While holding the surface of the metal latch 202, pull the metal latch 202 to move left and right, so that the metal latch 202 is separated from the metal plate 203 and the metal slide bar 1 201, and then hold the middle position of the connecting handle 108, pull the connecting handle 108 to rotate clockwise and counterclockwise, and the connecting handle 108 drives the sliding device 102 to rotate, and the sliding device 102 102 drives the metal slide bar 201 to rotate, and then hold the middle position of the connecting handle 108, push and hold the connecting handle 108 to move backward, the connecting handle 108 pushes the metal slide bar 201 to move backward, the metal slide bar 201 drives the sliding device 204 to move backward, so that the sliding device 204 can slide on the surface of the metal slide bar 2 303, and then push the connecting handle 108 to move left and right, so that the connecting handle 108 drives the sliding device 102 to move left and right, and the sliding device 102 drives the cleaning sponge 101 to move left and right, so that the cleaning sponge 101 can clean the casting.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cleaning device for casting processing, comprising a water storage tank (7) and a main body (3), characterized in that: The upper inner wall surface of the main body mechanism (3) is connected to a spray device (8); the lower inner wall surface of the main body mechanism (3) is connected to a wastewater collection box (6); the upper end of the wastewater collection box (6) is connected to a filter screen (5); the lower end surface of the wastewater collection box (6) is connected to a support platform (4); a limiting mechanism (2) is connected to the middle position of the main body mechanism (3); the upper end of the limiting mechanism (2) is connected to a cleaning mechanism (1); and the main body mechanism (3) is connected to the lower end surface of a storage water tank (7); The cleaning mechanism (1) comprises a sliding unit and a cleaning unit, wherein the sliding unit and the cleaning unit are arranged in sequence from top to bottom; The cleaning unit comprises a cleaning sponge (101), a metal plate (105), a threaded rod (106) and a hexagonal nut (107), wherein the cleaning sponge (101) is located at the lower end of the cleaning unit, the cleaning sponge (101) is connected to the bottom surface of the metal plate (105), the metal plate (105) is connected to the bottom surface of the threaded rod (106), and the threaded rod (106) is connected to the internal thread surface of the hexagonal nut (107); The limiting mechanism (2) comprises a metal slide bar (201), a metal latch (202), a metal plate (203) and a sliding device (204), wherein the sliding device (204) is located at the lower end of the limiting mechanism (2), the sliding device (204) is connected to the bottom surface of the metal plate (203), the metal plate (203) is connected to the left end surface of the metal slide bar (201), and the metal plate (203) is connected to the left end surface of the metal latch (202); The main body structure (3) comprises a cleaning shell (301), a metal shell (302), a second metal slide bar (303) and a metal support bar (304), wherein the metal support bar (304) is located at the upper end of the main body structure (3), the metal support bar (304) is connected to the top surface of the cleaning shell (301), the cleaning shell (301) is connected to the back side of the second metal slide bar (303), and the cleaning shell (301) is connected to the left side surface of the metal shell (302); The cleaning shell (301) is connected to the bottom surface of the spray device (8), the cleaning shell (301) is connected to the surface of the wastewater collection box (6), the cleaning shell (301) is located below the storage water tank (7), the storage water tank (7) is connected to the upper inner wall surface of the metal support rod (304), and the storage water tank (7) is connected to the top surface of the spray device (8); The second sliding device (204) is connected to the surface of the second metal sliding rod (303), the number of the second metal sliding rods (303) is three, and the three second metal sliding rods (303) are distributed at equal intervals. The second sliding device (204) is connected to the inner wall surface of the metal shell (302); The number of the metal plates 2 (203) is two, and the two metal plates 2 (203) are connected to the left end surface and the right end surface of the metal slide bar 1 (201), the metal slide bar 1 (201) is connected to the surface of the metal latch (202), and the metal slide bar 1 (201) is connected to the upper end inner wall surface of the sliding device 1 (102).

2. A cleaning device for casting processing according to claim 1, characterized in that: The number of the filter screens (5) is two, the two filter screens (5) are connected to the left and right sides of the upper end of the wastewater collection box (6), and the two filter screens (5) are connected to the left and right surfaces of the lower end of the support platform (4).

3. A cleaning device for casting processing according to claim 1, characterized in that: The sliding unit comprises a sliding device 1 (102), a limiting rod (103), a coil spring (104), a connecting handle (108) and a connecting plate (109); the connecting handle (108) is located at the upper end of the sliding unit; the connecting handle (108) is connected to the top surface of the sliding device 1 (102); the sliding device 1 (102) is connected to the top surface of the coil spring (104); the sliding device 1 (102) is connected to the upper end surface of the limiting rod (103); and the limiting rod (103) is connected to the top surface of the connecting plate (109).

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