Dispersion machine for producing low-VOC printing ink

Abstract

The utility model belongs to the technical field of printing ink production equipment, and particularly relates to a dispersion machine for producing low-VOC (volatile organic compound) printing ink, which is characterized in that a printing ink barrel is arranged on the upper surface of a base and is used for containing a printing ink material to be dispersed, and an electric push rod is started to drive a dispersion component to move downwards through a transverse plate when the printing ink is dispersed; the dispersing assembly is arranged in the printing ink barrel, the dispersing assembly can enter the printing ink barrel, at the moment, a first rotating motor is started, and an output shaft of the first rotating motor drives a rotating shaft to rotate, so that the dispersing assembly is driven to disperse a printing ink material; by arranging the dispersing assembly, ink materials at different heights and positions in the ink barrel can be dispersed by the dispersing assembly, sufficient dispersion is ensured, the dispersing effect is greatly improved, the quality stability of a product is improved, the ink barrel can be fixed and clamped by arranging the clamping assembly, and the situation that dispersion is affected by shaking of the ink barrel is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to printing ink production equipment technical field, especially relate to a low VOC printing ink production is with dispersion machine. BACKGROUND

[0002] The dispersion machine is a kind of dispersion device, and strong turbulence can be formed in local by high-speed disperser, and the dispersion machine is suitable for high-speed stirring, dissolving and dispersing of liquid and liquid-powder materials in the fields of paint, dye, printing ink, pigment, cosmetics, resin, adhesive, latex, medicine, petroleum and the like.

[0003] However, the existing printing ink dispersing machine has the problem of poor dispersion effect when dispersing printing ink materials, and the printing ink materials rotate at high speed in the barrel along with the rotation of the dispersion disc, which generates strong thrust on the inner wall of the barrel, and further causes the barrel to shake easily, even to tip over, affecting the use of printing ink materials and reducing the use effect. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above-mentioned technical problem, provides a low VOC printing ink production is with dispersion machine to solve the problem in the above background art.

[0005] Therefore, the utility model provides a low VOC printing ink production is with dispersion machine, the upper surface of base is provided with printing ink barrel;

[0006] Clamping assembly, clamping assembly is arranged on the base;

[0007] Support, the upper surface of base is fixedly provided with support on one side, the top surface of support is fixedly provided with electric push rod through fixed plate on one side, the output end of electric push rod is fixedly provided with horizontal plate, the top surface of horizontal plate is fixedly provided with first rotary motor, the output end of first rotary motor is fixedly connected with rotating shaft and penetrates horizontal plate, the bottom of rotating shaft is provided with lifting assembly and dispersion assembly, and the hollow reciprocating screw rod is arranged in the printing ink barrel.

[0008] In the above technical scheme, further, the hollow reciprocating screw rod is fixedly connected with lifting block on the outer wall, and the bottom of rotating shaft penetrates the hollow reciprocating screw rod and extends into the printing ink barrel.

[0009] In the above technical scheme, further, the bottom side extension of rotating shaft is fixedly connected with disc, the top of disc is fixedly connected with two second sliding rods, and the top of two second sliding rods is fixedly connected with two second sliding rods.

[0010] In the above technical scheme, further, the dispersion assembly includes:

[0011] Two rectangular plates are respectively fixedly connected to the front side and the rear side of the lifting block.

[0012] Two connecting rods are fixedly connected to the sides of the two rectangular plates away from the lifting block.

[0013] In the above technical solution, further, the sides of the two connecting rods away from each other are fixedly connected with dispersion blocks, the outer wall of the rotating shaft is rotatably connected with a cover plate, the bottom of the cover plate is fixedly connected with the hollow reciprocating screw rod, the inner wall of the cover plate is in contact with the ink barrel, the top of the cover plate is fixedly connected with two fixed columns, and the top of the fixed column is fixedly connected with the horizontal plate.

[0014] In the above technical solution, further, the clamping assembly comprises:

[0015] Two sliding grooves are formed in the base.

[0016] A bidirectional screw rod is rotatably connected inside one of the sliding grooves.

[0017] A second rotary motor is fixedly connected to the output shaft of the second rotary motor at one end of the bidirectional screw rod.

[0018] Two nut blocks are symmetrically screw-connected to the surface of the bidirectional screw rod.

[0019] An arc-shaped clamping plate is fixedly installed at the upper end of each nut block.

[0020] A first sliding rod is arranged inside the other sliding groove.

[0021] Two sliding blocks are slidably connected to the first sliding rod, and the top of the sliding block is fixedly connected to the bottom of the arc-shaped clamping plate.

[0022] A limiting assembly is arranged on one side of the arc-shaped clamping plate.

[0023] In the above technical solution, further, the limiting assembly comprises:

[0024] A U-shaped plate is installed on the side edge of the arc-shaped clamping plate.

[0025] A pull rod is installed through the inside of the U-shaped plate.

[0026] A limiting plate is installed at one end of the pull rod.

[0027] A fixed rod is installed at the other end of the limiting plate.

[0028] A spring is sleeved on the side edge of the limiting plate on the surface of the pull rod.

[0029] A pull handle is installed at the other end of the pull rod.

[0030] The ink barrel is provided with a fixed hole corresponding to the fixed rod on both sides.

[0031] In the above technical solution, further, the inner surface of the arc-shaped clamping plate is provided with a rubber pad.

[0032] The beneficial effects of the present application are as follows:

[0033] 1. The lifting assembly comprises a hollow reciprocating screw rod arranged in the ink barrel, so that the dispersion assembly can perform dispersion operation on ink materials at different heights and positions in the ink barrel, ensuring sufficient dispersion and greatly improving the dispersion effect and the quality stability of the product.

[0034] 2. The inner surface of the arc-shaped clamping plate is provided with a rubber pad, which can reduce the wear of the ink barrel and increase the friction to improve the stability.

[0035] 3. The ink barrel can be fixed and clamped by the clamping assembly, so as to avoid the influence of the shaking of the ink barrel on the dispersion. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural schematic diagram of the present application;

[0037] Figure 2 is a schematic diagram of the internal structure of the ink barrel of the present application;

[0038] Figure 3 is a schematic diagram of the clamping assembly structure of the present application;

[0039] Figure 4 is a schematic diagram of the ink barrel structure of the present application;

[0040] The marks in the figure are as follows: 1-base, 2-ink barrel, 3-bracket, 4-electric push rod, 5-cross plate, 6-first rotary motor, 7-rotary shaft, 8-hollow reciprocating screw rod, 9-lifting block, 10-rectangular plate, 11-connecting rod, 12-dispersion block, 13-fixed column, 14-sliding groove, 15-bidirectional screw rod, 16-second rotary motor, 17-nut block, 18-arc-shaped clamping plate, 19-first sliding rod, 20-sliding block, 21-U-shaped plate, 22-pull rod, 23-limiting plate, 24-fixed rod, 25-spring, 26-pull handle, 27-fixed hole, 28-rubber pad, 29-cover plate, 30-disc, 31-second sliding rod. DETAILED DESCRIPTION

[0041] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0042] Embodiment 1:

[0043] The embodiment provides a dispersing machine for low VOC printing ink production, which comprises:

[0044] A base 1 is provided with an ink barrel 2 on the upper surface of the base 1.

[0045] A clamping assembly is arranged on the base 1.

[0046] A support 3 is fixedly arranged on one side of the upper surface of the base 1, a motor-driven push rod 4 is fixedly arranged on one side of the top surface of the support 3 through a fixed plate, a horizontal plate 5 is fixedly arranged at the output end of the motor-driven push rod 4, a first rotary motor 6 is fixedly arranged on the top surface of the horizontal plate 5, a rotating shaft 7 is fixedly connected to the output end of the first rotary motor 6 and penetrates through the horizontal plate 5, and a lifting assembly and a dispersing assembly are arranged at the bottom of the rotating shaft 7. The lifting assembly comprises a hollow reciprocating screw rod 8 arranged in the ink barrel 2.

[0047] It can be seen from the embodiment that the base 1 is provided with the ink barrel 2 on the upper surface of the base 1, which is used for containing printing ink materials to be dispersed. The support 3 is fixedly arranged on one side of the upper surface of the base 1. When the ink is dispersed, the motor-driven push rod 4 is started to drive the dispersing assembly to move downward through the horizontal plate 5, so that the dispersing assembly can enter the inside of the ink barrel 2. At this time, the first rotary motor 6 is started, the output shaft of the first rotary motor 6 drives the rotating shaft 7 to rotate, thereby driving the dispersing assembly to disperse the ink materials. The lifting assembly comprises the hollow reciprocating screw rod 8 arranged in the ink barrel 2, so that the dispersing assembly can disperse the ink materials at different heights and positions in the ink barrel 2, thereby ensuring sufficient dispersion and greatly improving the dispersion effect and the quality stability of the product. When the dispersing assembly rotates at high speed in the ink barrel 2, a strong thrust will be generated on the inner wall of the ink barrel 2, which will cause the ink barrel 2 to shake or even tip over. The clamping assembly can be arranged to fix and clamp the ink barrel 2, thereby avoiding the shaking of the ink barrel 2 from affecting the dispersion.

[0048] Embodiment 2:

[0049] The embodiment provides a dispersing machine for low VOC printing ink production, which comprises the technical solutions of the above-mentioned embodiments and has the following technical features.

[0050] A lifting block 9 is threadedly connected to the outer wall of the hollow reciprocating screw rod 8, and the bottom of the rotating shaft 7 penetrates through the hollow reciprocating screw rod 8 and extends into the ink barrel 2.

[0051] The embodiment can be seen that the hollow reciprocating screw rod 8 is threadedly connected with the lifting block 9 on the outer wall, and the bottom of the rotating shaft 7 penetrates through the hollow reciprocating screw rod 8 and extends into the ink barrel 2.

[0052] Embodiment 3:

[0053] The embodiment provides a dispersing machine for low VOC printing ink production, in addition to the technical scheme of the above-mentioned embodiment, further has the following technical features.

[0054] The bottom side extension of the rotating shaft 7 is fixedly connected with a disc 30, the top of the disc 30 is fixedly connected with two second sliding rods 31, the top of the two second sliding rods 31 is slidably penetrated through the lifting block 9 and extends to the outside.

[0055] The embodiment can be seen that the bottom side extension of the rotating shaft 7 is fixedly connected with the disc 30, the top of the disc 30 is fixedly connected with the two second sliding rods 31, and the top of the two second sliding rods 31 is slidably penetrated through the lifting block 9 and extends to the outside, the second sliding rod 31 is arranged to limit the lifting block 9, so that the second sliding rod 31 can stably move up and down on the hollow reciprocating screw rod 8.

[0056] Embodiment 4:

[0057] The embodiment provides a dispersing machine for low VOC printing ink production, in addition to the technical scheme of the above-mentioned embodiment, further has the following technical features.

[0058] The dispersing assembly comprises:

[0059] The two rectangular plates 10 are fixedly connected to the front side and the rear side of the lifting block 9 respectively;

[0060] The two rectangular plates 10 are fixedly connected with connecting rods 11 away from the lifting block 9.

[0061] The embodiment can be seen that the two rectangular plates 10 are fixedly connected to the front side and the rear side of the lifting block 9 respectively, and the two rectangular plates 10 are fixedly connected with the connecting rods 11 away from the lifting block 9.

[0062] Embodiment 5:

[0063] The embodiment provides a dispersing machine for low VOC printing ink production, in addition to the technical scheme of the above-mentioned embodiment, further has the following technical features.

[0064] The two connecting rods 11 are fixedly connected with the dispersion blocks 12 on the sides away from each other, the outer wall of the rotating shaft 7 is rotationally connected with the cover plate 29, the bottom of the cover plate 29 is fixedly connected with the hollow reciprocating screw rod 8, the inner wall of the cover plate 29 is in contact with the ink barrel 2, the top of the cover plate 29 is fixedly connected with the two fixed columns 13, and the top of the two fixed columns 13 is fixedly connected with the horizontal plate 5.

[0065] It can be seen from the embodiment that the two connecting rods 11 are fixedly connected with the dispersion blocks 12 on the sides away from each other, the dispersion blocks 12 are used for dispersing ink, the cover plate 29 is arranged to prevent ink from splashing during dispersion, the electric push rod 4 is opened, the electric push rod 4 drives the dispersion assembly to move downward through the horizontal plate 5, the dispersion assembly can enter the inside of the ink barrel 2, the first rotating motor 6 is opened at this time, the output shaft of the first rotating motor 6 drives the rotating shaft 7 to rotate, the rotating shaft 7 drives the two second sliding rods 31 to rotate around the rotating shaft 7 at the same time through the disc 30, the hollow reciprocating screw rod 8 is threadedly connected with the lifting block 9, and the second sliding rod 31 is rotationally connected with the lifting block 9, so that when the two second sliding rods 31 rotate at the same time, the lifting block 9 is lifted while rotating, so that the ink can be dispersed at different heights and positions, the stratification phenomenon can be avoided, the ink can be fully stirred and dispersed in the whole container, and therefore the dispersion effect is greatly improved, the product quality stability is improved, when the lifting block 9 is lifted, the lifting block 9 drives the dispersion block 12 on the connecting rod 11 to rotate under the connection of the rectangular plate 10, the ink in the ink barrel 2 is uniformly stirred when the dispersion block 12 rotates, the dispersion block 12 can stir the ink in the ink barrel 2 from different angles in the process of rotating with the lifting block 9, so that the ink is stirred in multiple directions, can be more comprehensively covered, and the ink can be fully stirred at each position, and therefore the uniformity of dispersion is greatly improved.

[0066] Embodiment 6:

[0067] The embodiment provides a dispersion machine for low-VOC printing ink production, in addition to the technical solutions of the above-mentioned embodiments, and has the following technical features.

[0068] The clamping assembly comprises:

[0069] The base 1 is provided with two sliding grooves 14;

[0070] The two sliding grooves 14 are rotationally connected with the bidirectional screw rods 15;

[0071] The second rotating motor 16 is fixedly connected with the output shaft of the second rotating motor 16.

[0072] Nut block 17, the surface of the bidirectional screw rod 15 is symmetrically threaded with two nut blocks 17;

[0073] Arc-shaped clamping plate 18, the upper end of each nut block 17 is fixedly installed with an arc-shaped clamping plate 18;

[0074] First sliding rod 19, the other sliding groove 14 is provided with a first sliding rod 19;

[0075] Slide block 20, two slide blocks 20 are slidably connected on the first sliding rod 19, and the top of the slide block 20 is fixedly connected with the bottom of the arc-shaped clamping plate 18;

[0076] Limiting assembly, one side of the arc-shaped clamping plate 18 is provided with a limiting assembly.

[0077] As can be seen from the embodiment, in use, the second rotary motor 16 is started, the output shaft of the second rotary motor 16 drives the bidirectional screw rod 15 to rotate, the two nut blocks 17 move relative to each other on the bidirectional screw rod 15, and the two nut blocks 17 drive the two arc-shaped clamping plates 18 to move relative to each other, thereby clamping and fixing the ink barrel 2. The first sliding rod 19 and the slide block 20 can improve the stability of the structure. After the arc-shaped clamping plate 18 clamps and fixes the ink barrel 2, the limiting assembly further limits the ink barrel 2, ensures the clamping stability, and avoids shaking of the ink barrel 2 during ink dispersion, thereby affecting the dispersion effect.

[0078] Embodiment 7:

[0079] The embodiment provides a low-VOC printing ink production dispersing machine, in addition to the technical solutions of the above-mentioned embodiments, further having the following technical features.

[0080] The limiting assembly comprises:

[0081] U-shaped plate 21, the side edge of the arc-shaped clamping plate 18 is provided with a U-shaped plate 21;

[0082] Pull rod 22, a pull rod 22 is installed inside the U-shaped plate 21;

[0083] Limiting plate 23, a limiting plate 23 is installed at one end of the pull rod 22;

[0084] Fixed rod 24, a fixed rod 24 is installed at the other end of the limiting plate 23, and the fixed rod 24 penetrates the arc-shaped clamping plate 18;

[0085] Spring 25, a spring 25 is sleeved on the side edge of the limiting plate 23 on the surface of the pull rod 22;

[0086] Pull handle 26, a pull handle 26 is installed at the other end of the pull rod 22;

[0087] The fixed hole 27 is provided on the two sides of the ink barrel 2 corresponding to the fixed rod 24.

[0088] As can be seen from the embodiment, after the two arc-shaped clamping plates 18 clamp and fix the ink barrel 2, the pull handle 26 is pulled, the pull rod 22 is pulled by the pull handle 26, the limiting plate 23 and the fixed rod 24 are pulled by the pull rod 22, and the spring 25 is compressed, when the fixed hole 27 is aligned with the fixed rod 24, the pull handle 26 is released, the spring 25 rebounds, thereby driving the fixed rod 24 to be inserted into the inside of the fixed hole 27, so as to improve the fixing effect of the ink barrel 2.

[0089] Embodiment 8:

[0090] The embodiment provides a low-VOC printing ink production dispersing machine, in addition to the technical scheme of the above-mentioned embodiment, further having the following technical features.

[0091] The inner surface of the arc-shaped clamping plate 18 is provided with a rubber pad 28.

[0092] As can be seen from the embodiment, the inner surface of the arc-shaped clamping plate 18 is provided with a rubber pad 28, which can reduce the abrasion of the ink barrel 2, increase the friction and improve the stability, and the rubber pad 28 is provided with a circular groove, so as to avoid affecting the sliding of the fixed rod 24.

[0093] Working principle: when in use, the ink barrel 2 is placed between the two arc-shaped clamping plates 18, the second rotary motor 16 is started, the output shaft of the second rotary motor 16 drives the bidirectional screw rod 15 to rotate, the two nut blocks 17 move relatively on the bidirectional screw rod 15, the two nut blocks 17 drive the two arc-shaped clamping plates 18 to move relatively, so as to clamp and fix the ink barrel 2, the first sliding rod 19 and the sliding block 20 are arranged, which can improve the stability of the structure, after the arc-shaped clamping plate 18 clamps and fixes the ink barrel 2, the pull handle 26 is pulled, the pull rod 22 is pulled by the pull handle 26, the limiting plate 23 and the fixed rod 24 are pulled by the pull rod 22, and the spring 25 is compressed, when the fixed hole 27 is aligned with the fixed rod 24, the pull handle 26 is released, the spring 25 rebounds, thereby driving the fixed rod 24 to be inserted into the inside of the fixed hole 27, further limiting the ink barrel 2, ensuring the clamping stability effect, avoiding the shaking of the ink barrel 2 when the ink is dispersed, thereby affecting the dispersion effect.

[0094] The printing ink material is poured into the ink barrel 2, and the electric push rod 4 is started to drive the dispersion assembly to move downward through the horizontal plate 5, so that the dispersion assembly can enter the inside of the ink barrel 2. At this time, the first rotary motor 6 is started, and the output shaft of the first rotary motor 6 drives the rotating shaft 7 to rotate, and the rotating shaft 7 drives the two second sliding rods 31 to rotate around the rotating shaft 7 through the disc 30. Since the hollow reciprocating screw rod 8 is in threaded connection with the lifting block 9, and the second sliding rod 31 is in rotary connection with the lifting block 9, when the two second sliding rods 31 rotate at the same time, the lifting block 9 is lifted while rotating, so that the ink can be dispersed at different heights and positions, the stratification phenomenon can be avoided, the ink in the whole container can be fully stirred and dispersed, thereby the dispersion effect is greatly improved, the product quality stability is improved, and when the lifting block 9 is lifted, the lifting block 9 drives the dispersion block 12 on the connecting rod 11 to rotate under the connection of the rectangular plate 10. When the dispersion block 12 rotates, the ink in the ink barrel 2 is uniformly stirred, and the dispersion block 12 can stir the ink in the ink barrel 2 from different angles in the process of rotating with the lifting block 9, so that the ink is stirred from multiple directions, can be more fully covered, so that the ink can be fully stirred at each position, thereby the dispersion uniformity is greatly improved.

[0095] The embodiments of the present application are described above in combination with the drawings, and the embodiments and the features in the embodiments in the present application can be combined with each other without conflict, the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative, but not limited, and a person skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, which all belong to the protection of the present application.

Claims

1. A disperser for low VOC printing ink production, characterized by, The utility model relates to a printing ink ink bucket, belong to printing ink ink bucket technical field. It includes: Base (1), the upper surface of base (1) is provided with printing ink barrel (2); Clamping assembly, the base (1) is provided with clamping assembly; 2. The dispersing machine for producing a low VOC printing ink according to claim 1, wherein Support (3), the upper surface of base (1) one side is fixedly provided with support (3), and the top of support (3) one side is fixedly provided with electric push rod (4) through fixed plate, and the output end of electric push rod (4) is fixedly provided with horizontal plate (5), and the top of horizontal plate (5) is fixedly provided with first rotary motor (6), and the output end of first rotary motor (6) penetrates horizontal plate (5) and is fixedly connected with rotating shaft (7), and the bottom of rotating shaft (7) is provided with lifting assembly and dispersion assembly, and lifting assembly includes hollow reciprocating screw rod (8) setting in printing ink barrel (2).

3. The dispersing machine for producing a low VOC printing ink according to claim 2, characterized in that, The outer wall of hollow reciprocating screw rod (8) is threadedly connected with lifting block (9), and the bottom of rotating shaft (7) penetrates hollow reciprocating screw rod (8) and extends into printing ink barrel (2).

4. The dispersing machine for producing a low VOC printing ink according to claim 3, characterized in that, The bottom extension of rotating shaft (7) is fixedly connected with disc (30), and the top of disc (30) is fixedly connected with two second sliding rods (31), and the top of two second sliding rods (31) all slidingly penetrates lifting block (9) and extends to the outside. The dispersion assembly includes: Rectangular plate (10), two rectangular plates (10) are fixedly connected on the front side and the back side of lifting block (9) respectively; 5. The dispersing machine for producing a low VOC printing ink according to claim 4, characterized in that, Connecting rod (11), the side, away from lifting block (9), of two rectangular plates (10) is fixedly connected with connecting rod (11).

6. The dispersing machine for producing a low VOC printing ink according to claim 5, wherein The side, away from each other, of two connecting rods (11) is fixedly connected with dispersion block (12), and the outer wall of rotating shaft (7) is rotatably connected with cover plate (29), and the bottom of cover plate (29) is fixedly connected with hollow reciprocating screw rod (8), and the inner wall of cover plate (29) is in contact with printing ink barrel (2), and the top of cover plate (29) is fixedly connected with two fixed columns (13), and the top of two fixed columns (13) is fixedly connected with horizontal plate (5). The clamping assembly includes: Slide groove (14), two slide grooves (14) are formed in base (1); Two-way screw rod (15), one of slide grooves (14) is rotatably connected with two-way screw rod (15); Second rotary motor (16), one end of two-way screw rod (15) extends to the outside of base (1) and is fixedly connected with the output shaft of second rotary motor (16); Nut block (17), the surface of two-way screw rod (15) is symmetrically threadedly connected with two nut blocks (17); Arc-shaped clamping plate (18), one arc-shaped clamping plate (18) is fixedly installed on the upper end of each nut block (17); First sliding rod (19), first sliding rod (19) is arranged in the other slide groove (14); Slide block (20), two slide blocks (20) are slidingly connected on first sliding rod (19), and the top of slide block (20) is fixedly connected with the bottom of arc-shaped clamping plate (18); 7. The dispersing machine for producing a low VOC printing ink according to claim 6, wherein Limiting assembly, one side of arc-shaped clamping plate (18) is provided with limiting assembly. The limiting assembly includes: U-shaped plate (21), U-shaped plate (21) is installed on the side edge of arc-shaped clamping plate (18); A pull rod (22) is installed through the inside of the U-shaped plate (21); A limiting plate (23) is installed at one end of the pull rod (22); A fixed rod (24) is installed at the other end of the limiting plate (23), and the fixed rod (24) penetrates the arc-shaped clamping plate (18); A spring (25) is sleeved on the side of the limiting plate (23) of the surface of the pull rod (22); A pull handle (26) is installed at the other end of the pull rod (22); Fixed holes (27) are formed on both sides of the ink barrel (2) corresponding to the fixed rod (24).

8. The dispersing machine for producing a low VOC printing ink according to claim 7, characterized in that, The inner surface of the arc-shaped clamping plate (18) is provided with a rubber pad (28).

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