Horizontal sand mill with discharging pressure adjusting function

Abstract

The utility model relates to the technical field of coating production equipment, and discloses a horizontal sand mill with a discharge pressure regulating function, which comprises a fixed table, an outer barrel and an inner barrel, the front side of the top of the fixed table is fixedly connected with an air pump, one end of the air pump is communicated with a pipeline I, one end of the pipeline I is communicated with a pressure box, and the other end of the pipeline I is communicated with a pipeline II; and a partition plate is fixedly connected to the middle of the inner wall of the pressure box, the inner wall of the partition plate communicates with a pressure regulator, the right side of the pressure box communicates with a second pipeline, the left side of the outer barrel communicates with a discharging pipe, and the outer wall of the discharging pipe is fixedly connected with an electromagnetic valve. According to the utility model, the air pump is responsible for carrying out negative pressure treatment on the pressure box, and the pressure in the pipeline II can be ensured through the pressure regulator, so that the fine regulation of the pressure is realized, and the discharge amount of the discharge pipe can be changed by regulating the change of the air pressure in the pressure box, so that the discharge requirements of different flows are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of paint production equipment especially relates to a horizontal sand mill with discharge pressure regulating function. BACKGROUND

[0002] The working principle of the horizontal sand mill is that solid-liquid phase mixed material after pre-dispersing and wetting treatment by the stirring machine is input into the cylinder by the material pump, the material and sand mill medium in the cylinder are agitated by the high-speed rotating distributor, so that the solid particles in the material and the sand mill medium produce more intense collision, friction and shearing action, the purpose of accelerating the grinding of fine particles and dispersing aggregates is achieved, and the horizontal sand mill is a kind of machine widely used for paint, dye and ink materials.

[0003] Through retrieval, the patent with patent number CN209968552U discloses a horizontal sand mill, which comprises a base, a grinding cylinder, a rotating motor, the grinding cylinder is detachably installed on the base, the grinding cylinder is provided with a grinding shaft, the grinding shaft is driven by the rotating motor, characterized in that: the grinding shaft is provided with a first dispersion disc assembly and a second dispersion disc, the first dispersion disc assembly comprises four triangular first dispersion discs, the first dispersion discs are assembled on the working end of the grinding shaft at the same interval and different installation angles, and the grinding cylinder, a diaphragm pump and a stirring tank are connected in series to form a circulation loop.The horizontal sand mill of the utility model is combined with the stirring tank, the paint circulates between the stirring tank and the grinding cylinder, the automatic repeated grinding of the paint can be realized by using a single sand mill, the labor intensity of workers can be effectively reduced, the production efficiency is improved, and the product quality is ensured. However, in actual use, the above-mentioned device has the problems that the discharge pressure is controlled by manually adjusting the opening degree of the outlet valve, which is simple and easy to implement, but it is difficult to ensure accuracy in a continuous production environment, resulting in fluctuations in product quality, therefore, the horizontal sand mill with discharge pressure regulating function is proposed to solve the above-mentioned problems. UTILITY MODEL CONTENTS

[0004] In order to make up for the above shortcomings, the utility model provides a horizontal sand mill with discharge pressure regulating function, which aims at improving the problem that the discharge pressure is controlled by manually adjusting the opening degree of the outlet valve in the prior art, which is difficult to ensure accuracy in a continuous production environment, resulting in fluctuations in product quality.

[0005] In order to achieve the above object, the utility model discloses the following technical scheme: a horizontal sand mill with discharge pressure regulating function, including fixed platform, outer bucket and inner bucket, the top front side of fixed platform is fixedly connected with air pump, one end of air pump is connected with pipeline no.

[0006] Through the above technical scheme: when the inner bucket produces pressure, the pressure between the discharge pipe and the inner bucket connection is transmitted into the pressure tank through the pipeline no. 2, and the pressure tank is divided into two areas by the partition plate. The two areas are connected by the pressure regulator, and the pressure of the inner bucket is monitored in real time by the pressure sensor. The pressure between the discharge pipe and the inner bucket connection is accurately adjusted by starting the air pump and the pressure regulator, and the uniform discharge pressure effect is realized.

[0007] Further description of the above technical scheme:

[0008] The heat dissipation mechanism includes an air inlet pipe, one end of the air inlet pipe is connected to the outer wall of the outer barrel, one end of the air inlet pipe is connected to the air inlet pipe, and the inner wall of the air inlet pipe is fixedly connected to the filter screen. The other end of the air inlet pipe penetrates the outer wall of the outer barrel and is connected to the connecting pipe no. 1. The outer wall left side of the connecting pipe no. 1 is connected to a plurality of copper pipes. A plurality of air holes are formed in the outer wall of the copper pipe. The left end of the copper pipe is connected to the connecting pipe no. 2. The outer wall bottom of the connecting pipe no. 2 is connected to the exhaust pipe. The other end of the exhaust pipe penetrates the inner wall of the outer barrel and is connected to the fan. The outer wall of the inner barrel is fixedly connected to a plurality of cooling fins.

[0009] Through the above technical scheme: the copper pipe is arranged between the inner barrel and the outer barrel. The diameter of the copper pipe is designed from small to large. The two ends of the copper pipe are connected by the connecting pipe no. 1 and the connecting pipe no. 2 respectively. The internal heat is extracted through the exhaust pipe by starting the fan, and the external air is injected into the device through the air inlet pipe. The air circulation is realized, the cooling treatment of the device is accelerated, and the diameter of the copper pipe can gradually reduce the temperature of the air in the copper pipe, thereby further improving the cooling effect.

[0010] Further description of the above technical scheme:

[0011] The inner wall of the outer barrel is fixedly connected to the outer wall of the inner barrel, and the top of the outer wall of the inner barrel is connected to the feeding pipe.

[0012] Through the technical scheme, the outer barrel and the inner barrel are designed in an integrated manner, and the space formed in the middle can be subjected to heat dissipation treatment.

[0013] Further description is made to the technical scheme:

[0014] The bottom of the fixing table is fixedly connected with supporting frames, and the bottom of each supporting frame is fixedly connected with a supporting column.

[0015] Through the technical scheme, the fixing table is supported by the supporting frames and the supporting columns, thereby ensuring the stability of the device during operation.

[0016] Further description is made to the technical scheme:

[0017] The right side of the supporting frame is fixedly connected with a placing plate, and the bottom of the placing plate is fixedly connected with a reinforcing plate.

[0018] Through the technical scheme, the placing plate is installed and fixed by the supporting frame and is reinforced by the reinforcing plate, so that the placing plate can support heavy objects without shaking.

[0019] Further description is made to the technical scheme:

[0020] The top of the placing plate is fixedly connected with a control box, and the top of the control box is fixedly connected with a controller.

[0021] Through the technical scheme, the controller facilitates simple operation control of the running equipment on the entire device.

[0022] Further description is made to the technical scheme:

[0023] The front side of the control box is rotatably connected with a hinge, and the outer wall of the hinge is rotatably connected with a box door.

[0024] Through the technical scheme, the box door is connected by the hinge, so that the box door can be flipped open for convenient maintenance.

[0025] Further description is made to the technical scheme:

[0026] The front side of the box door is fixedly connected with a handle, and the outer wall of the handle is fixedly connected with an anti-skid sleeve.

[0027] Through the technical scheme, the handle is installed on the box door, and the handle facilitates flipping of the box door, thereby realizing operation.

[0028] The utility model has the following beneficial effects:

[0029] 1. The utility model discloses a first air pump and pressure tank are connected through pipeline no. 1, and the air pump is responsible for the pressure tank negative pressure processing to reach the purpose of pressure regulation, and the pressure tank is accurately divided through the partition board, forms two independent pressure spaces, installs the pressure regulator between the partition board, can ensure the pressure of being close to the inside of pipeline no. 2, thereby realizes the fine adjustment of pressure, through the change of the air pressure in pressure tank, can change the discharge size of discharge pipe, thereby satisfies the discharge demand of different flow.

[0030] 2. The utility model discloses through the air collecting hood collection air, and guide to the air inlet pipe, the filter screen can filter the impurity and dust in the air, and the copper pipe is arranged between the inner bucket and the outer bucket, forms an effective heat dissipation channel, and exchanges heat with the outside through the air hole, to further reduce the temperature in the copper pipe, when the fan starts, will draw out the heat in the device through the exhaust pipe, and through the cooperation of the air collecting hood and the air inlet pipe, injects the air outside into the device, realizes the circulation flow of air, not only improves the heat dissipation efficiency, but also helps to keep the air in the device fresh. DRAWINGS

[0031] Figure 1 It is a perspective view of the horizontal sand mill with discharge pressure regulation function that the utility model proposes;

[0032] Figure 2 It is a front view of the horizontal sand mill with discharge pressure regulation function that the utility model proposes;

[0033] Figure 3 It is the structure schematic diagram of the pressure tank of the horizontal sand mill with discharge pressure regulation function that the utility model proposes;

[0034] Figure 4 It is a sectional view of the horizontal sand mill with discharge pressure regulation function that the utility model proposes;

[0035] Figure 5 It is the structure schematic diagram of the heat dissipation mechanism of the horizontal sand mill with discharge pressure regulation function that the utility model proposes.

[0036] LEGEND:

[0037] 1, fixed platform; 2, heat dissipation mechanism; 201, air inlet pipe; 202, gas collection cover; 203, filter screen; 204, connecting pipe one; 205, copper pipe; 206, connecting pipe two; 207, exhaust pipe; 208, fan; 209, fin; 210, air hole; 3, outer barrel; 4, air pump; 5, pipeline one; 6, pressure tank; 7, partition; 8, pressure regulator; 9, pipeline two; 10, discharge pipe; 11, electromagnetic valve; 12, pressure sensor; 13, feed pipe; 14, support frame; 15, support column; 16, placing plate; 17, reinforcing plate; 18, control box; 19, controller; 20, hinge; 21, box door; 22, handle; 23, anti-skid sleeve; 24, inner barrel. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0039] With reference to Figure 1 , Figure 2 and Figure 3 , the utility model provides an embodiment: a horizontal sand mill with discharge pressure regulation function, including fixed platform 1, outer barrel 3 and inner barrel 24, outer barrel 3 and inner barrel 24 are integrated design, the top front side of fixed platform 1 is fixedly connected with air pump 4, one end of air pump 4 is connected with pipeline one 5, one end of pipeline one 5 is connected with pressure tank 6, air pump 4 is installed and fixed through fixed platform 1, ensure the firmness of air pump 4, air pump 4 and pressure tank 6 are communicated through pipeline one 5, carry out negative pressure treatment in pressure tank 6 through air pump 4, the inner wall middle part of pressure tank 6 is fixedly connected with partition 7, the inner wall of partition 7 is communicated with pressure regulator 8, the inside of pressure tank 6 is accurately divided through partition 7, forms two pressure spaces, and pressure regulator 8 is installed between partition 7, the right side of pressure tank 6 is communicated with pipeline two 9, can ensure the pressure near the inside of pipeline two 9 through pressure regulator 8, the left side of outer barrel 3 is communicated with discharge pipe 10, pipeline two 9 and discharge pipe 10 are communicated, change the discharge size of discharge pipe 10 by adjusting the air pressure in pressure tank 6, realize the discharge requirement of adapting to different flow, the outer wall of discharge pipe 10 is fixedly connected with electromagnetic valve 11, the other end of pipeline two 9 penetrates the outer wall of outer barrel 3 and is communicated on the outer wall top of discharge pipe 10, the outer wall top of outer barrel 3 is fixedly connected with pressure sensor 12, the inner wall of outer barrel 3 is provided with heat dissipation mechanism 2, the inner wall of outer barrel 3 is fixedly connected on the outer wall of inner barrel 24, the outer wall top of inner barrel 24 is communicated with feed pipe 13;

[0040] Specifically, the air pump 4 is fixedly installed on the top front side of the fixing table 1, the air pump 4 is communicated with the pressure tank 6 through the pipeline I 5 at one end, in order to ensure the firmness of the air pump 4, the air pump 4 is connected with the pressure tank 6 through the pipeline I 5, the air pump 4 is responsible for the negative pressure treatment of the pressure tank 6, in order to achieve the purpose of adjusting the pressure, the inner wall of the pressure tank 6 is fixedly connected with the partition plate 7, the inner wall of the partition plate 7 is communicated with the pressure regulator 8, so that the inside of the pressure tank 6 is accurately divided into two independent pressure spaces by the partition plate 7, the pressure regulator 8 is installed between the partition plate 7, which can ensure the pressure near the inside of the pipeline II 9, so as to realize the fine adjustment of the pressure, the left side of the outer barrel 3 is communicated with the discharge pipe 10, the pipeline II 9 is communicated with the discharge pipe 10, by adjusting the change of air pressure in the pressure tank 6, the discharge size of the discharge pipe 10 can be changed, so as to meet the discharge demand of different flow, in order to further control the discharge process, the outer wall of the discharge pipe 10 is fixedly connected with the electromagnetic valve 11, the discharge pipe 10 is opened or closed according to the need, so as to control the discharge of the material, the other end of the pipeline II 9 penetrates through the outer wall of the outer barrel 3 and is communicated with the outer wall top of the discharge pipe 10, which ensures the smoothness of the discharge process, the outer wall top of the outer barrel 3 is fixedly connected with the pressure sensor 12, which can monitor and feedback the pressure change in real time, so as to ensure the stability and safety of the whole discharge process, the outer wall top of the inner barrel 24 is communicated with the feeding pipe 13, so that the material can smoothly enter the inside of the sand mill for grinding treatment.

[0041] Referring to Figure 2 , Figure 4 and Figure 5 , the heat dissipation mechanism 2 comprises an air inlet pipe 201, one end of the air inlet pipe 201 is communicated with the outer wall right side of the outer barrel 3, one end of the air inlet pipe 201 is communicated with a gas collecting cover 202, the inner wall of the gas collecting cover 202 is fixedly connected with a filter screen 203, the other end of the air inlet pipe 201 penetrates through the outer wall of the outer barrel 3 and is communicated with a connecting pipe I 204, the outer wall left side of the connecting pipe I 204 is communicated with a plurality of copper pipes 205, the copper pipes 205 are arranged between the inner barrel 24 and the outer barrel 3, the caliber of the copper pipes 205 adopts a design from small to large, a plurality of air holes 210 are formed in the outer wall of the copper pipes 205, the left end of the copper pipes 205 is communicated with a connecting pipe II 206, and the two ends of the copper pipes 205 are connected through the connecting pipe I 204 and the connecting pipe II 206 respectively, the outer wall bottom of the connecting pipe II 206 is communicated with an air outlet pipe 207, the other end of the air outlet pipe 207 penetrates through the inner wall of the outer barrel 3 and is communicated with a fan 208, the internal heat is extracted through the air outlet pipe 207 by starting the fan 208, and the external air is injected into the device through the gas collecting cover 202 cooperating with the air inlet pipe 201, air circulation is realized, a plurality of heat dissipation fins 209 are fixedly connected with the outer wall of the inner barrel 24, the temperature of the air in the copper pipes 205 is gradually reduced by the caliber of the copper pipes 205, so as to further improve the cooling effect.

[0042] Specifically, one end of the air inlet pipe 201 is connected with the right side of the outer wall of the outer barrel 3, which ensures the smooth entry of air. In addition, a gas collecting cover 202 is connected with the one end of the air inlet pipe 201. The design of the gas collecting cover 202 helps to collect more air and guide it into the air inlet pipe 201. The inner wall of the gas collecting cover 202 is fixedly connected with a filter screen 203. The filter screen 203 filters out impurities and dust in the air to ensure that the air entering the device is clean. The other end of the air inlet pipe 201 penetrates the outer wall of the outer barrel 3 and is connected with the connecting pipe I 204. The outer wall of the connecting pipe I 204 is uniformly connected with a plurality of copper pipes 205. The copper pipes 205 are arranged between the inner barrel 24 and the outer barrel 3 to form an effective heat dissipation channel. The diameter of the copper pipes 205 gradually increases from small to large, which helps to optimize the flow of air in the copper pipes 205 and improve the heat dissipation efficiency. A plurality of air holes 210 are uniformly arranged on the outer wall of the copper pipes 205. The air holes 210 allow air to flow in the copper pipes 205 and exchange heat with the outside through the air holes 210, thereby further reducing the temperature in the copper pipes 205. The left end of the copper pipes 205 is connected with the connecting pipe II 206. The two ends of the copper pipes 205 are connected with the connecting pipe I 204 and the connecting pipe II 206 respectively to form a complete air flow path. The outer wall of the connecting pipe II 206 is connected with the exhaust pipe 207. The other end of the exhaust pipe 207 penetrates the inner wall of the outer barrel 3 and is connected with the fan 208. When the fan 208 is started, it will extract the heat in the device through the exhaust pipe 207 and inject external air into the device through the cooperation of the gas collecting cover 202 and the air inlet pipe 201 to realize the circulation of air. This not only improves the heat dissipation efficiency but also helps to keep the air in the device fresh. In addition, the outer wall of the inner barrel 24 is fixedly connected with a plurality of cooling fins 209. The cooling fins 209 increase the heat dissipation area and accelerate the cooling process of the device. The diameter design of the copper pipes 205 not only helps to gradually reduce the temperature of the air in the copper pipes but also further improves the cooling effect of the entire device by optimizing the air flow path, thereby realizing efficient and stable heat dissipation performance.

[0043] Referring to Figure 2 , Figure 4 and Figure 5The bottom of the fixing table 1 is fixedly connected with a support frame 14, the bottom of the support frame 14 is fixedly connected with a support column 15, the right side of the support frame 14 is fixedly connected with a placing plate 16, the bottom of the placing plate 16 is fixedly connected with a reinforcing plate 17, the top of the placing plate 16 is fixedly connected with a control box 18, the top of the control box 18 is fixedly connected with a controller 19, the front side of the control box 18 is rotatably connected with a hinge 20, the outer wall of the hinge 20 is rotatably connected with a box door 21, the front side of the box door 21 is fixedly connected with a handle 22, and the outer wall of the handle 22 is fixedly connected with an anti-skid sleeve 23.

[0044] Specifically, the bottom of the fixing table 1 is fixedly connected with a support frame 14, the bottom of the support frame 14 is fixedly connected with a support column 15 to ensure the stability of the whole structure, the right side of the support frame 14 is fixedly connected with a placing plate 16, the bottom of the placing plate 16 is further enhanced in load capacity through a reinforcing plate 17, the top of the placing plate 16 is fixedly connected with a control box 18, the front side of the control box 18 is rotatably connected with a hinge 20, so that the box door 21 can be flexibly opened and closed, the front side of the box door 21 is fixedly connected with a handle 22 for convenient user operation, and in order to improve the comfort and safety during use, the outer wall of the handle 22 is also fixedly connected with an anti-skid sleeve 23, so that stable gripping can be realized in various environments.

[0045] Working principle: first, the air pump 4 is connected with the pressure tank 6 through the pipeline one 5, the air pump 4 is responsible for negative pressure treatment of the pressure tank 6 to achieve the purpose of adjusting the pressure, the inside of the pressure tank 6 is accurately divided into two independent pressure spaces through the partition plate 7, the pressure regulator 8 is installed between the partition plate 7, which can ensure the pressure close to the inside of the pipeline two 9, so as to realize fine adjustment of the pressure, by adjusting the change of air pressure in the pressure tank 6, the discharge size of the discharge pipe 10 can be changed, so as to meet the discharge demand of different flow, according to the need, the discharge pipe 10 is opened or closed to control the discharge of the material, the other end of the pipeline two 9 penetrates the outer wall of the outer barrel 3 and is communicated with the outer wall top of the discharge pipe 10, so as to ensure the smoothness of the discharge process, the pressure sensor 12 can monitor and feedback the change of pressure in real time, so as to ensure the stability and safety of the whole discharge process;

[0046] And through the gas collecting cover 202 collection air, and lead to the air inlet pipe 201, filter screen 203 can filter out the impurities and dust in the air, ensure that the air into the device inside is clean, copper pipe 205 is arranged between the inner barrel 24 and the outer barrel 3, forms an effective heat dissipation channel, the caliber of copper pipe 205 adopts the design of gradually from small to big, this design helps to optimize the flow of air in the copper pipe 205, improve the heat dissipation efficiency, air hole 210 is to allow air to flow in the copper pipe 205, and through the air hole 210 and the outside heat exchange, so as to further reduce the temperature inside the copper pipe 205, the two ends of copper pipe 205 are connected through the connecting pipe one 204 and the connecting pipe two 206 respectively, forms a complete air circulation path, when the fan 208 starts, will be through the exhaust pipe 207 and the device inside the heat is extracted, and through the gas collecting cover 202 and air inlet pipe 201 cooperation, the outside air injection device inside, realize the circulation of air, not only improve the heat dissipation efficiency, also help to keep the air inside the device fresh.

[0047] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of protection of the present application.

Claims

1. A horizontal sand mill having a discharge pressure regulating function, comprising a fixed table (1), an outer barrel (3) and an inner barrel (24), characterized in that: The top front side of the fixing table (1) is fixedly connected with an air pump (4), one end of the air pump (4) is communicated with a pipeline I (5), one end of the pipeline I (5) is communicated with a pressure tank (6), the inner wall of the pressure tank (6) is fixedly connected with a partition (7), the inner wall of the partition (7) is communicated with a pressure regulator (8), the right side of the pressure tank (6) is communicated with a pipeline II (9), the left side of the outer barrel (3) is communicated with a discharge pipe (10), the outer wall of the discharge pipe (10) is fixedly connected with a solenoid valve (11), the other end of the pipeline II (9) penetrates through the outer wall of the outer barrel (3) and is communicated with the outer wall top of the discharge pipe (10), the outer wall top of the outer barrel (3) is fixedly connected with a pressure sensor (12), and the inner wall of the outer barrel (3) is provided with a heat dissipation mechanism (2).

2. The horizontal sand mill with discharge pressure regulation function according to claim 1, characterized in that: The heat dissipation mechanism (2) comprises an air inlet pipe (201), one end of the air inlet pipe (201) is communicated with the outer wall right side of the outer barrel (3), one end of the air inlet pipe (201) is communicated with a gas collection cover (202), the inner wall of the gas collection cover (202) is fixedly connected with a filter screen (203), the other end of the air inlet pipe (201) penetrates through the outer wall of the outer barrel (3) and is communicated with a connecting pipe I (204), the outer wall left side of the connecting pipe I (204) is communicated with a plurality of copper pipes (205), a plurality of air holes (210) are formed in the outer wall of the copper pipes (205), the left end of the copper pipes (205) is communicated with a connecting pipe II (206), the outer wall bottom of the connecting pipe II (206) is communicated with an exhaust pipe (207), the other end of the exhaust pipe (207) penetrates through the inner wall of the outer barrel (3) and is communicated with a fan (208), and the outer wall of the inner barrel (24) is fixedly connected with a plurality of heat dissipation fins (209).

3. The horizontal sand mill with discharge pressure regulation function according to claim 1, characterized in that: The inner wall of the outer barrel (3) is fixedly connected with the outer wall of the inner barrel (24), and the outer wall top of the inner barrel (24) is communicated with a feeding pipe (13).

4. The horizontal sand mill with discharge pressure regulation function according to claim 1, characterized in that: The bottom of the fixing table (1) is fixedly connected with a support frame (14), and the bottom of the support frame (14) is fixedly connected with a support column (15).

5. The horizontal sand mill with discharge pressure regulation function according to claim 4, characterized in that: The right side of the support frame (14) is fixedly connected with a placing plate (16), and the bottom of the placing plate (16) is fixedly connected with a reinforcing plate (17).

6. The horizontal sand mill with discharge pressure regulation function according to claim 5, characterized in that: The top of the placing plate (16) is fixedly connected with a control box (18), and the top of the control box (18) is fixedly connected with a controller (19).

7. The horizontal sand mill with discharge pressure regulation function according to claim 6, characterized in that: The front side of the control box (18) is rotatably connected with a hinge (20), and the outer wall of the hinge (20) is rotatably connected with a box door (21).

8. The horizontal sand mill with discharge pressure regulation function according to claim 7, characterized in that: The front side of the box door (21) is fixedly connected with a handle (22), and the outer wall of the handle (22) is fixedly connected with an anti-skid sleeve (23).

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