Water return tank of casting mold

Abstract

The utility model discloses a water return tank of a casting mold, and relates to the technical field of mold auxiliary equipment. Comprising a water tank body, water inlet mechanisms are fixedly connected to the surfaces of the two sides of the water tank body, each water inlet mechanism comprises two sets of connecting pipes, and one ends of the two sets of connecting pipes are movably connected with fixing pipes. Water entering the water tank body is filtered through the annular filter screen, impurities entering the water tank body are reduced, and the fan is driven to rotate through the flow speed of cooling water, so that the transmission rod is matched to drive the scraping block to scrape scale on the inner wall of the fixed pipe, and scale accumulation on the inner wall of the fixed pipe is prevented; the flow speed of water flow is increased to a certain extent, a threaded lantern ring is used, a worker can conveniently disassemble and clean an annular filter screen regularly, a motor is matched with a rotating rod to drive a scraping strip to scrape away residual garbage on the inner wall of the fixed box, and therefore the inner wall of the fixed box can be conveniently cleaned and used.

Description

Technical Field

[0001] The utility model relates to the technical field of die auxiliary equipment, in particular to a water return tank for a casting die. Background Technique

[0002] When producing aluminum alloy wheels, low-pressure casting of aluminum alloy wheels is the most common and cost-effective way of wheel production. The die is a key component for wheel forming. After the die completes one wheel forming, the cooling water in the die cooling cavity needs to be discharged through the water return tank.

[0003] In the prior art, due to impurities in the water, after the water inlet pipe is used for a long time, more scale may adhere to the inner wall of the water inlet pipe. If the scale inside the water inlet pipe is not cleaned for a long time, when the scale accumulates inside the water inlet pipe, it may cause poor water inlet of the water inlet pipe, thus affecting the normal use of the water tank body. Moreover, after the garbage on the inner wall of the water tank body is washed, some garbage may remain on its inner wall, which is not convenient for the staff to clean and use the water tank body. Content of the Utility Model

[0004] Based on this, the purpose of the utility model is to provide a water return tank for a casting die to solve the technical problems of scale adhering to the inner wall of the water inlet pipe and incomplete cleaning of the water tank body.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A water return tank for a casting die, including a water tank body, and water inlet mechanisms are fixedly connected to both side surfaces of the water tank body;

[0006] The water inlet mechanism includes two groups of connecting pipes. One end of each of the two groups of connecting pipes is movably connected to a fixed pipe. The end of the fixed pipe away from the connecting pipe is fixedly connected to the water tank body. An annular filter screen is movably installed inside the fixed pipe. A fan is rotatably installed at the center position of the side surface of the annular filter screen away from the connecting pipe. A transmission rod is fixedly connected to the side surface of the fan away from the annular filter screen. A scraping block that fits the inner wall of the fixed pipe is fixedly sleeved on the outer wall of the transmission rod. Threaded collars are movably sleeved on the outer walls of the two groups of connecting pipes and the fixed pipe. The end of the connecting pipe away from the fixed pipe is fixedly connected to a connecting pipe. Multiple water inlet pipes are fixedly connected to the side surface of the connecting pipe away from the connecting pipe;

[0007] A fixed block is longitudinally fixedly connected to the inner wall of the water tank body. A motor is fixedly installed at the bottom end of the inner wall of the fixed block, and the output end of the motor is connected to a rotating rod through a coupling. A scraping strip is fixedly connected to the outer wall of the rotating rod. A fixed box is fixedly connected to the bottom end of the water tank body, and the scraping strip fits the inner wall of the fixed box.

[0008] By adopting the above technical solution, when the cooling water enters the water inlet pipe and enters the fixed pipe through the cooperation of the connecting pipe and the connecting tube, the cooling water is first filtered by the annular filter screen. Due to the flow rate of the water flow itself, the fan inside the fixed pipe is driven to rotate. The fan drives the transmission rod to rotate, and the transmission rod drives the scraping block to scrape the scale attached to the inner wall of the fixed pipe, preventing the accumulation of scale on the inner wall of the fixed pipe and ensuring smooth flow of the cooling water.

[0009] Meanwhile, the motor drives the rotating rod to rotate, and the rotating rod drives the scraping strip to rotate on the inner wall of the fixed box. The scraping strip scrapes the garbage remaining on the inner wall of the fixed box, thus facilitating the cleaning and use of the inside of the fixed box.

[0010] Furthermore, two groups of filter nets are symmetrically and movably installed on both sides of the inner wall of the water tank body where the fixed block is located. First limiting strips are fixedly connected to both side surfaces of the fixed block, and second limiting strips are fixedly connected to both inner walls of the water tank body. The filter nets are movably clamped between the first limiting strips and the second limiting strips.

[0011] By adopting the above technical solution, the filter nets are installed and used through the first limiting strips and the second limiting strips. The cooling water is filtered again by the filter nets to avoid sewage pollution.

[0012] Furthermore, a box door is rotatably connected to the front surface of the water tank body. A handle is fixedly connected to the surface of the box door. The bottom end of the fixed box is conical, and a water outlet pipe is fixedly connected to the bottom end of the fixed box.

[0013] By adopting the above technical solution, the box door is opened by using the handle, the pull rod is pulled downward, and the pull rod drives the fixed pipe to separate from the filter net, so that the filter net can be disassembled, thus facilitating the cleaning of the filter net. The used cooling water is discharged through the water outlet pipe.

[0014] Furthermore, a pull rod is provided below the filter net. Fixed rods are fixedly connected to the upper surfaces of both ends of the pull rod. Two fixing plates are provided on the upper surface of the pull rod, and the fixed rods are sleeved on the fixing plates. A spring is fixedly sleeved on the outer wall of the fixed rod, and one end of the spring is fixedly connected to the fixing plate. Jacks matching the fixed rods are opened at one ends of the first limiting strip and the second limiting strip close to the box door, and slots matching the jacks are opened at one end of the filter net close to the box door.

[0015] By adopting the above technical solution, when the filter net needs to be installed, the pull rod is pulled downward, the filter net is clamped to the inner walls of the first limiting strip and the second limiting strip, the pull rod is released, and under the action of the spring, the fixed rod penetrates through the jack into the slot on the filter net, so that the filter net can be fixedly installed.

[0016] When the filter screen needs to be disassembled, by pulling down the pull rod, the pull rod cooperates with the spring to drive the fixed rod to separate from the slot on the filter screen, and then the filter screen can be disassembled and used. The operation is relatively simple, the use is convenient, and it can prevent the filter screen from shaking during use.

[0017] Further, one end of the connecting pipe is fixedly connected with a plurality of mounting blocks. The inner wall of the fixed pipe far away from the water tank body is provided with a mounting groove matching the mounting blocks. Four connecting blocks are symmetrically and fixedly connected to the curved outer wall of the annular filter screen. The four connecting blocks match the mounting groove, and one end of the mounting block is attached to the connecting block.

[0018] By adopting the above technical solution, the connecting pipe can be connected to the fixed pipe by inserting the mounting block into the mounting groove inside the fixed pipe. The annular filter screen can be installed by clamping the connecting block to the inner wall of the mounting groove. The annular filter screen can be limited by the connecting pipe during use, preventing the annular filter screen from displacing when used on the inner wall of the fixed pipe.

[0019] Further, a fixed ring is fixedly sleeved on the curved outer wall of the connecting pipe near one end of the mounting block. A limiting ring is fixedly sleeved on the curved outer wall of the fixed pipe near one end of the mounting groove. A fixing groove matching the fixed ring is opened on the inner wall of one end of the threaded sleeve ring. The threaded sleeve ring is threadedly connected to the fixed pipe, and a rubber sealing ring is fixedly sleeved on the inner wall of the threaded sleeve ring.

[0020] By adopting the above technical solution, the threaded sleeve ring is limited by the cooperation of the fixed ring and the fixing groove. The joint of the connecting pipe and the fixed pipe is sealed by the rubber sealing ring installed on the inner wall of the threaded sleeve ring, preventing water leakage at the joint.

[0021] Further, two limiting rods are fixedly connected to the outer wall of the end of the transmission rod far away from the fan. A limiting groove is opened on the inner wall of the end of the fixed pipe far away from the mounting groove. The end of the limiting rod far away from the transmission rod is attached to the limiting groove.

[0022] By adopting the above technical solution, the scraping block is limited by the mutual cooperation of the limiting rod and the limiting groove, facilitating the scraping block to fit the inner wall of the fixed pipe, so as to facilitate the scraping of the scale on the inner wall of the fixed pipe.

[0023] In summary, the present utility model mainly has the following beneficial effects: The present utility model filters the water entering the interior of the water tank body through an annular filter screen to reduce the impurities entering the water tank body. The rotation of the fan is driven by the self-flow rate of the cooling water, and then the scraping block is driven by the transmission rod to scrape the scale on the inner wall of the fixed pipe, preventing the accumulation of scale on the inner wall of the fixed pipe, and improving the flow rate of the water to a certain extent. By using the threaded sleeve ring, it is convenient for the staff to regularly disassemble and clean the annular filter screen. The motor drives the scraping bar through the rotating rod to scrape the residual garbage on the inner wall of the fixed box, facilitating the cleaning of the inner wall of the fixed box. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0025] Figure 2 is a schematic diagram of the disassembly structure of the water inlet mechanism of the present utility model from the first perspective;

[0026] Figure 3 is a schematic diagram of the disassembly structure of the water inlet mechanism of the present utility model from the second perspective;

[0027] Figure 4 is a schematic diagram of the partial structure of the present utility model viewed from below;

[0028] Figure 5 is of the present utility model Figure 4 partial structure schematic diagram at A in;

[0029] Figure 6 is a schematic diagram of the internal structure decomposition of the fixed box of the present utility model;

[0030] Figure 7 is a schematic diagram of the top view structure of the present utility model.

[0031] In the figure: 100, water tank body; 110, box door; 111, fixed box; 112, water outlet pipe; 113, first limit strip; 1131, second limit strip; 114, filter screen; 115, fixed rod; 116, pull rod; 117, fixed block; 118, rotating rod; 119, scraping bar; 120, water inlet mechanism; 121, connecting pipe; 1211, fixed ring; 1212, mounting block; 122, threaded sleeve ring; 1221, fixed groove; 123, fixed pipe; 1231, limit ring; 1232, mounting groove; 1233, limit groove; 124, annular filter screen; 1241, connecting block; 125, fan; 126, transmission rod; 127, scraping block; 128, limit rod; 129, connecting pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. The embodiments described by referring to the accompanying drawings below are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0033] The following will describe the embodiments according to the overall structure of the present utility model.

[0034] A water return tank of a casting mold, as Figure 1-7 shown, includes a water tank body 100, and water inlet mechanisms 120 are fixedly connected to both side surfaces of the water tank body 100;

[0035] The water inlet mechanism 120 includes two groups of connecting pipes 121. One ends of the two groups of connecting pipes 121 are movably connected to a fixed pipe 123. The end of the fixed pipe 123 away from the connecting pipe 121 is fixedly connected to the water tank body 100. An annular filter screen 124 is movably installed on the inner wall of the fixed pipe 123. A fan 125 is rotatably installed at the central position of the side surface of the annular filter screen 124 away from the connecting pipe 121. A transmission rod 126 is fixedly connected to the side surface of the fan 125 away from the annular filter screen 124. A scraping block 127 that fits the inner wall of the fixed pipe 123 is fixedly sleeved on the outer wall of the transmission rod 126. Threaded collar rings 122 are movably sleeved on the outer walls of the two groups of connecting pipes 121 and the fixed pipe 123. The end of the connecting pipe 121 away from the fixed pipe 123 is fixedly connected to a connecting pipe 129, and multiple water inlet pipes are fixedly connected to the side surface of the connecting pipe 129 away from the connecting pipe 121;

[0036] A fixed block 117 is longitudinally fixedly connected to the inner wall of the water tank body 100. A motor is fixedly installed at the bottom end of the inner wall of the fixed block 117, and the output end of the motor is connected to a rotating rod 118 through a coupling. A scraping strip 119 is fixedly connected to the outer wall of the rotating rod 118. A fixed box 111 is fixedly connected to the bottom end of the water tank body 100, and the scraping strip 119 fits the inner wall of the fixed box 111.

[0037] First, connect the connecting pipe 121 and the fixed pipe 123 by using the threaded collar ring 122. Cooling water enters the connecting pipe 129 through the water inlet pipe, and then enters the fixed pipe 123 through the connecting pipe 121. The flow rate of the cooling water itself drives the fan 125 inside the fixed pipe 123 to rotate. The fan 125 drives the scraping block 127 through the transmission rod 126 to scrape the scale on the inner wall of the fixed pipe 123, preventing the scale from accumulating on the inner wall of the fixed pipe 123 after long-term use and affecting the normal use of the fixed pipe 123;

[0038] When it is necessary to clean the inner wall of the fixed box 111, start the motor, and the top drives the transmission rod 126 to rotate. The transmission rod 126 drives the scraping block 127 to rotate. The scraping block 127 scrapes the garbage remaining on the inner wall of the fixed box 111, and then injects water into the water tank body 100, so as to flush the garbage out of the water outlet pipe 112.

[0039] Please refer to Figure 4 、 Figure 5 、 Figure 7 On both sides of the fixing block 117 on the inner wall of the water tank body 100, two groups of filter nets 114 are symmetrically and movably installed. On both side surfaces of the fixing block 117, first limiting strips 113 are fixedly connected. On both inner walls of the water tank body 100, second limiting strips 1131 are fixedly connected. The filter net 114 is movably clamped between the first limiting strip 113 and the second limiting strip 1131.

[0040] The cooling water is secondarily filtered through the filter net 114, and the filter net 114 is installed by using the mutual cooperation of the first limiting strip 113 and the second limiting strip 1131.

[0041] Please refer to Figure 1 、 Figure 4 、 Figure 7 On the front surface of the water tank body 100, a box door 110 is rotatably connected. On the surface of the box door 110, a handle is fixedly connected. The bottom end of the fixed box 111 is conical, and a water outlet pipe 112 is fixedly connected to the bottom end of the fixed box 111.

[0042] Open the box door 110 through the handle, which is convenient for the staff to disassemble and clean the filter net 114. The sewage inside the fixed box 111 can be discharged through the water outlet pipe 112.

[0043] Please refer to Figure 5 Below the filter net 114, a pull rod 116 is provided. On the upper surfaces of both ends of the pull rod 116, fixing rods 115 are fixedly connected. On the upper surface of the pull rod 116, two groups of fixing plates are provided, and the fixing rods 115 are sleeved on the fixing plates. A spring is fixedly sleeved on the outer wall of the fixing rod 115, and one end of the spring is fixedly connected to the fixing plate. At one end of the first limiting strip 113 and the second limiting strip 1131 close to the box door 110, insertion holes matching the fixing rods 115 are opened. At one end of the filter net 114 close to the box door 110, slots matching the insertion holes are opened.

[0044] When it is necessary to install the filter net 114, open the box door 110, pull down the pull rod 116, slide the filter net 114 to be clamped between the first limiting strip 113 and the second limiting strip 1131, release the pull rod 116, and the pull rod 116 resets under the action of its own spring force. The fixing rod 115 passes through the insertion hole and penetrates into the slot on the filter net 114, so as to facilitate the fixed installation of the filter net 114;

[0045] When the filter net 114 needs to be disassembled, by pulling down the through rod 116, the rod 116 cooperates with the fixed rod 115 to squeeze the spring. When the fixed rod 115 is separated from the slot, the filter net 114 can be disassembled and used.

[0046] Please refer to Figure 2 and Figure 3 As shown in, one end of the connecting pipe 121 is fixedly connected with a plurality of mounting blocks 1212. The inner wall of the fixed pipe 123 far away from the water tank body 100 is provided with mounting grooves 1232 matching the mounting blocks 1212. Four connecting blocks 1241 are symmetrically and fixedly connected to the curved outer wall of the annular filter net 124. The four connecting blocks 1241 match the mounting grooves 1232, and one end of the mounting block 1212 is attached to the connecting block 1241.

[0047] First, install the annular filter net 124 into the fixed pipe 123. The connecting block 1241 is used to limit the annular filter net 124 in cooperation with the mounting groove 1232. By inserting the mounting block 1212 into the mounting groove 1232, the connecting pipe 121 can be connected to the fixed pipe 123.

[0048] Please refer to Figure 2 and Figure 3 As shown in, a fixing ring 1211 is fixedly sleeved on the curved outer wall of the connecting pipe 121 near one end of the mounting block 1212. A limiting ring 1231 is fixedly sleeved on the curved outer wall of the fixed pipe 123 near one end of the mounting groove 1232. A fixing groove 1221 matching the fixing ring 1211 is provided on the inner wall of one end of the threaded sleeve ring 122. The threaded sleeve ring 122 is threadedly connected to the fixed pipe 123, and a rubber sealing ring is fixedly sleeved on the inner wall of the threaded sleeve ring 122.

[0049] The fixing ring 1211 is used to limit the threaded sleeve ring 122. By threadedly connecting the threaded sleeve ring 122 to the fixed pipe 123, when the limiting ring 1231 contacts one end of the threaded sleeve ring 122, at this time, the connecting pipe 121 is just connected to the fixed pipe 123.

[0050] Please refer to Figure 2 and Figure 3 As shown in, two limiting rods 128 are fixedly connected to the outer wall of one end of the transmission rod 126 far away from the fan 125. A limiting groove 1233 is provided on the inner wall of one end of the fixed pipe 123 far away from the mounting groove 1232. One end of the limiting rod 128 far away from the transmission rod 126 is attached to the limiting groove 1233.

[0051] The transmission rod 126 drives the limiting rod 128 to rotate. The limiting rod 128 can be used to limit the scraping block 127 in cooperation with the limiting groove 1233.

[0052] The working principle of the present utility model is as follows: When in use, first install the annular filter screen 124 together with the connecting block 1241 onto the fixed pipe 123. The annular filter screen 124 is limited by the installation groove 1232 and the connecting block 1241 to prevent the annular filter screen 124 from shaking during use. Then, the installation block 1212 on the connecting pipe 121 is snapped into the installation groove 1232 on the fixed pipe 123. By rotating the threaded collar 122, the threaded collar 122 is threadedly connected to the fixed pipe 123, and thus the connecting pipe 121 and the fixed pipe 123 are fixedly connected. The rubber sealing ring installed on the inner wall of the threaded collar 122 is used to seal the connection between the connecting pipe 121 and the fixed pipe 123 to prevent water leakage at the connection;

[0053] Cooling water enters the connecting pipe 129 through the water inlet pipe, and then enters the fixed pipe 123 through the connecting pipe 121. The annular filter screen 124 inside the fixed pipe 123 filters the cooling water for the first time. The flow rate of the cooling water itself drives the fan 125 inside the fixed pipe 123 to rotate. The fan 125 drives the scraping block 127 to rotate on the inner wall of the fixed pipe 123 through the transmission rod 126. The limiting rod 128 and the limiting groove 1233 can limit the scraping block 127, so that the scraping block 127 always adheres to the inner wall of the fixed pipe 123, thereby facilitating the scraping of the scale on the inner wall of the fixed pipe 123;

[0054] After the cooling water enters the water tank body 100, it is secondarily filtered by the filter screen 114, and the filtered cooling water is discharged through the water outlet pipe 112;

[0055] When it is necessary to clean the residual garbage on the inner wall of the fixed box 111, start the motor. The motor drives the rotating rod 118 to rotate, and the rotating rod 118 drives the scraping strip 119 to rotate back and forth on the inner wall of the fixed box 111, thereby scraping the garbage attached to the inner wall of the fixed box 111. By filling the inside of the fixed box 111 with water, the water flow drives the scraped garbage to be discharged through the water outlet pipe 112.

[0056] Although the embodiments of the present utility model have been shown and described, the specific embodiments are only explanations of the present utility model and not limitations thereof. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can, without departing from the principle and purpose of the present utility model, make modifications, substitutions and variations that do not contribute creatively to the embodiments as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.

Claims

1. A water return tank for a casting mold, comprising a water tank body (100), characterized in that: Water inlet mechanisms (120) are fixedly connected to both side surfaces of the water tank body (100); The water inlet mechanism (120) comprises two groups of connecting pipes (121), one end of each of the two groups of connecting pipes (121) is movably connected to a fixed pipe (123), one end of the fixed pipe (123) away from the connecting pipe (121) is fixedly connected to the water tank body (100), an annular filter (124) is movably mounted on the inner wall of the fixed pipe (123), a fan (125) is rotatably mounted at the center position of the surface of one side of the annular filter (124) away from the connecting pipe (121), and the fan (125) is away from the annular filter. A transmission rod (126) is fixedly connected to the surface of one side of the filter screen (124); a scraper block (127) that fits the inner wall of the fixed tube (123) is fixedly sleeved on the outer wall of the transmission rod (126); threaded collars (122) are movably sleeved on the outer walls of the two groups of connecting tubes (121) and the fixed tube (123); a connecting tube (129) is fixedly connected to one end of the connecting tube (121) away from the fixed tube (123); and a plurality of water inlet pipes are fixedly connected to the surface of one side of the connecting tube (129) away from the connecting tube (121); A fixing block (117) is longitudinally fixedly connected to the inner wall of the water tank body (100); a motor is fixedly mounted on the bottom end of the inner wall of the fixing block (117); an output end of the motor is connected to a rotating rod (118) via a coupling; a scraper strip (119) is fixedly connected to the outer wall of the rotating rod (118); a fixing box (111) is fixedly connected to the bottom end of the water tank body (100); and the scraper strip (119) is in contact with the inner wall of the fixing box (111).

2. A water return tank for a casting mold according to claim 1, characterized in that: Two groups of filter screens (114) are movably and symmetrically installed on the inner wall of the water tank body (100) on both sides of the fixed block (117), the two side surfaces of the fixed block (117) are fixedly connected with the first limit strip (113), the two side inner walls of the water tank body (100) are fixedly connected with the second limit strip (1131), and the filter screen (114) is movably connected to the first limit strip (113) and the second limit strip (1131).

3. A water return tank for a casting mold according to claim 2, characterized in that: The front surface of the water tank body (100) is rotatably connected to a tank door (110), the surface of the tank door (110) is fixedly connected to a handle, the bottom end of the fixed tank (111) is conical, and the bottom end of the fixed tank (111) is fixedly connected to a water outlet pipe (112).

4. A water return tank for a casting mold according to claim 3, characterized in that: A pull rod (116) is provided below the filter screen (114), and the upper surfaces of both ends of the pull rod (116) are fixedly connected to fixing rods (115), and the upper surface of the pull rod (116) is provided with two sets of fixing plates, and the fixing rod (115) is sleeved on the fixing plates, and the outer wall of the fixing rod (115) is fixedly sleeved with a spring, and one end of the spring is fixedly connected to the fixing plate, and the first limit strip (113) and the second limit strip (1131) are provided with a socket matching the fixing rod (115) at one end close to the box door (110), and the filter screen (114) is provided with a slot matching the socket at one end close to the box door (110).

5. The water return tank of a casting mold according to claim 1, characterized in that: One end of the connecting pipe (121) is fixedly connected to a plurality of mounting blocks (1212); an inner wall of the fixing pipe (123) away from the water tank body (100) is provided with a mounting groove (1232) matching the mounting block (1212); the curved outer wall of the annular filter (124) is symmetrically fixedly connected to four groups of connecting blocks (1241); the four groups of connecting blocks (1241) match the mounting grooves (1232); and one end of the mounting block (1212) is fitted to the connecting block (1241).

6. A water return tank for a casting mold according to claim 5, characterized in that: A fixing ring (1211) is fixedly sleeved on one end of the curved outer wall of the connecting pipe (121) close to the mounting block (1212); a limiting ring (1231) is fixedly sleeved on one end of the curved outer wall of the fixing pipe (123) close to the mounting groove (1232); a fixing groove (1221) matching the fixing ring (1211) is formed on the inner wall of one end of the threaded collar (122); the threaded collar (122) is threadedly connected to the fixing pipe (123); and a rubber sealing ring is fixedly sleeved on the inner wall of the threaded collar (122).

7. A water return tank for a casting mold according to claim 6, characterized in that: The outer wall of one end of the transmission rod (126) away from the fan (125) is fixedly connected with two sets of limiting rods (128); the inner wall of one end of the fixing tube (123) away from the installation groove (1232) is provided with a limiting groove (1233); and one end of the limiting rod (128) away from the transmission rod (126) is in contact with the limiting groove (1233).

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