Dust-free drag chain capable of adjusting bending angle of cable

Abstract

The utility model relates to the technical field of dust-free drag chains, and discloses a dust-free drag chain capable of adjusting the bending angle of a cable. A clamp block, a dustproof body and a keel; at least two rows of keels are symmetrically arranged in the dustproof body; the clamp block is detachably arranged on the outer surface of the dustproof body and used for stably connecting the dustproof body to the outer side of the keel in a sleeving mode, the keel comprises a middle chain link, and the middle chain link is composed of a plurality of keel blocks clamped end to end; when equipment such as a numerical control machine tool and an automatic production line needs to change the bending angle of a connecting cable for operation, only the first connecting convex block of the keel block needs to slide along the notch length of the first connecting groove of the adjacent keel block and is fixed at different arc positions of the wave notch; a cable attached to the dustproof body can be bent at a large or small angle, and the workload of manually disassembling and assembling the drag chain again is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dust-free drag chains, in particular to a dust-free drag chain with adjustable cable bending angles. Background Art

[0002] Drag chain, also known as tank chain, is a device designed for dynamic applications. Its main function is to store, pull and protect various built-in cables (such as cables and wires), pipes (such as air pipes, oil pipes, water pipes), etc., so that these lines can run in an orderly and safe manner in a complex and changeable sports environment. Its structure is similar to the track of a tank, consisting of multiple movable unit links, each of which can be opened separately, which is convenient for installation, maintenance and the addition and removal of lines.

[0003] Since the drag chain is set on the outside of the cable to protect the reciprocating cable, in order to prevent the drag chain from sagging and swaying, a keel structure needs to be added inside the drag chain to support the drag chain, which can bear the weight of the cable and other components while maintaining the shape and stability of the drag chain. The design of the drag chain makes it low-noise, wear-resistant, and able to support high-speed movement. It is suitable for a variety of industrial scenarios such as CNC machine tools, robots, injection molding machinery, logistics and handling equipment, and the automotive industry.

[0004] Since the existing drag chain has a weak carrying capacity, the drag chain keel abutment position is often damaged during the process of the drag chain supporting the reciprocating motion of the cable, causing the cable to break during work, thereby causing problems such as reduced work efficiency.

[0005] In response to the problem that existing drag chain structures are prone to cable damage, the industry has conducted relevant research and designs, such as a keel structure and a drag chain using this structure. When the drag chain moves, the front end faces and rear end faces of adjacent supporting units are aligned to form a straight line, and the front and rear bevels of adjacent supporting units are bent at a certain angle, so that the cables can be transported at a certain angle. The cables in the drag chain will not wear each other, and dust will not enter the drag chain, thereby increasing the service life of the cables.

[0006] However, when the mechanical equipment needs to change the movement angle of the above-mentioned drag chain, it is necessary to change the links of its keel drag chain so that the connected cables can bend at a larger or smaller angle, which leads to a decrease in overall work efficiency; and there are fewer flip limit points between the links of the drag chain. When carrying heavier cables, the single point force between the links is too large, which can easily cause the entire drag chain to break. Utility Model Content

[0007] The utility model is to overcome the technical problems existing in the above-mentioned prior art and is a dust-free drag chain with adjustable cable bending angle.

[0008] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0009] A dust-free drag chain with adjustable cable bending angle, comprising: a clamp block, a dustproof body, and a keel; at least two rows of the keel are symmetrically arranged inside the dustproof body; the clamp block is detachably arranged on the outer surface of the dustproof body, and is used to stably sleeve the dustproof body on the outer side of the keel;

[0010] The keel includes an intermediate link, which is composed of a plurality of keel blocks that are mutually clamped end to end, a first connecting protrusion and a second connecting protrusion are provided inside the head end of the keel block, and a first connecting groove and a second connecting groove are provided at the tail end of the keel block to cooperate with the first connecting protrusion and the second connecting protrusion of the adjacent keel block;

[0011] The first connecting protrusion of the keel block is in the shape of a half-moon column, and the first connecting groove at the tail end is a wave groove; the first connecting protrusion of the keel block is selected to be hinged in the wave groove of the first connecting groove of the adjacent keel block, and the first connecting protrusions of the adjacent keel blocks can be selected to be fixed along the length direction of the groove of the first connecting groove of the adjacent keel blocks.

[0012] Preferably, the first connecting groove is a notch with wavy stripes, and the arc diameter of the wavy stripes is 1 to 2 mm larger than the diameter of the first connecting protrusion.

[0013] Preferably, the width of the first connecting groove is 1-2 mm greater than the thickness of the first connecting protrusion.

[0014] Preferably, the width of the second connecting groove is 1-2 mm greater than the thickness of the second connecting protrusion.

[0015] Preferably, the raised portion of the second connecting protrusion is conical.

[0016] Furthermore, the protrusion of the second connecting protrusion of the keel block is arranged in the second connecting groove of the adjacent keel block; the adjacent keel blocks limit the rotation angle by the cooperation of the second connecting protrusion and the second connecting groove.

[0017] Furthermore, a limiting portion is provided at the leading end edge of the keel block, and a protruding side of the limiting portion abuts against the trailing end edge of the adjacent keel block.

[0018] Preferably, the limiting portion is in the shape of a triangular protrusion.

[0019] Furthermore, a plurality of cables are arranged flatly or / and stacked inside the dustproof body, and at least two rows of keels are symmetrically arranged at the bottom, top or middle of the plurality of cables; the clamp block is detachably arranged on the outer surface of the dustproof body, for stably fixing the cables and keels inside the dustproof body.

[0020] Preferably, the dustproof body is a plurality of elliptical cylindrical rubbers connected at the sides.

[0021] Furthermore, the keel comprises a first chain link, an intermediate chain link and a tail chain link; one end of the intermediate chain link is detachably connected to the first chain link, and the other end of the intermediate chain link is detachably connected to the tail chain link; and a clamp connection hole is provided on the clamp block.

[0022] Furthermore, the first link is composed of a first bone block, the first end of the first bone block is provided with a first end fixing groove for connecting to a fixture block, and the tail end of the first bone block is provided with a first bone protrusion for connecting to a keel block of an intermediate link.

[0023] Furthermore, the tail link is composed of a coccyx block, the head end of the coccyx block is provided with a coccyx groove for connecting to the keel block of the middle link, and the tail end of the coccyx block is provided with a tail end fixed groove for connecting to the fixture block.

[0024] Furthermore, the edge of the groove wall of the first connecting groove is configured to be chamfered, and the edge of the first connecting protrusion is configured to be chamfered.

[0025] Furthermore, the fixture block is provided with a fixture connection hole, and the head end fixing groove is provided with a threaded connection hole, and the head bone block and the fixture block are fixedly connected by bolts.

[0026] Preferably, the bolts are fixedly connected to the head bone block and the clamp through the threaded connection holes.

[0027] Furthermore, a threaded connection hole is provided in the tail end fixed groove, and the coccyx block is fixedly connected to the clamp block by bolts.

[0028] Preferably, the bolts are fixedly connected to the coccyx block and the clamp via threaded connection holes.

[0029] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0030] ① A wavy first connecting groove is provided in the keel block to achieve bending at different angles;

[0031] When the mechanical equipment needs to change the rotation angle during operation, the arc position of the first connecting protrusion of the keel block at the wave groove of the adjacent keel block can be adjusted to allow the connected cable to bend at a larger or smaller angle.

[0032] ② Set multiple rotation limit points in the connection between the keel blocks to improve the rigidity and stability of the entire drag chain;

[0033] The adjacent keel blocks limit the rotation angle by the cooperation of the second connecting protrusion and the second connecting groove, and the limiting portion of the keel block is convex and abuts against the tail edge of the adjacent keel blocks. By setting multiple rotation limit points between adjacent keel blocks, the rigidity and stability of the entire drag chain can be improved, especially when carrying heavier cables, oil pipes, etc., it can better distribute the load and reduce excessive force on a single point.

[0034] ③ At least two rows of keels are symmetrically arranged in the dustproof body to evenly distribute the weight of the cables;

[0035] Several cables are laid flat or / and stacked inside the dustproof body, and at least two rows of keels are symmetrically arranged at the bottom, top or middle of the cables. A stable frame structure is formed by the symmetrically arranged keels, which effectively enhances the bending and torsion resistance of the entire drag chain, and can also effectively resist external vibration and impact, which is especially important for equipment that needs to work in a dynamic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the keel block;

[0037] Figure 2 It is a side view of the keel block;

[0038] Figure 3 It is a top view of the keel block;

[0039] Figure 4 The schematic diagram of the structure of the head bone;

[0040] Figure 5 is a schematic diagram of the structure of the coccyx block;

[0041] Figure 6 It is a schematic diagram of the structure of the connection between the coccyx block and the keel block;

[0042] Figure 7 A schematic diagram of the structure of the connection between the head bone block and the keel block;

[0043] Figure 8 The figure is a schematic diagram of the overall assembly structure of the cable.

[0044] Among them, 1. clamp block; 2. dustproof body; 3. keel block; 301. first connecting protrusion; 302. second connecting protrusion; 303. first connecting groove; 304. second connecting groove; 305. limiting part; 4. head bone block; 401. head end fixing groove; 402. head bone protrusion; 5. coccyx block; 501. coccyx fixing groove; 502. coccyx groove; 6. cable. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the described embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] Example 1

[0048] like Figure 1-8 As shown, this embodiment discloses a dust-free drag chain with adjustable cable bending angle, comprising a clamp block 1, a dustproof body 2, and a keel; at least two rows of keels are symmetrically arranged inside the dustproof body 2; the clamp block 1 is detachably arranged on the outer surface of the dustproof body 2, and is used to stably sleeve the dustproof body 2 on the outer side of the keel;

[0049] The keel includes an intermediate link, which is composed of a plurality of keel blocks 3 that are mutually clamped head to tail. A first connection protrusion 301 and a second connection protrusion 302 are provided inside the head end of the keel block 3, and a first connection groove 303 and a second connection groove 304 that cooperate with the first connection protrusion 301 and the second connection protrusion 302 of the adjacent keel block 3 are provided at the tail end of the keel block 3.

[0050] The first connecting protrusion 301 of the keel block 3 is in the shape of a half-moon column, and the first connecting groove 303 at the tail end is a wave groove; the first connecting protrusion 301 of the keel block 3 is selected to be hinged in the wave groove of the first connecting groove 303 of the adjacent keel block 3, and the first connecting protrusion 301 of the adjacent keel block 3 can be selected to be fixed along the length direction of the groove of the first connecting groove 303 of the adjacent keel block 3.

[0051] Specifically, when CNC machine tools, automated production lines and other equipment need to bend the connecting cables during operation, the first connecting protrusion 301 of the keel block 3 can be adjusted to the wave arc position of the first connecting groove 303 of the adjacent keel block 3, so that the cable 6 attached to the dustproof body 2 can be bent at a certain angle;

[0052] When CNC machine tools, automated production lines and other equipment need to change the bending angle of the connecting cable for operation, it is only necessary to slide the first connecting protrusion 301 of the keel block 3 along the length of the slot of the first connecting groove 303 of the adjacent keel block 3 and fix it at different arc positions of the wave slot, so that the cable 6 attached to the dustproof body 2 can be bent into a larger or smaller angle, ensuring smooth movement of the cable 6 at different angles and directions, avoiding damage caused by stiffness or excessive bending of the cable 6, and reducing the workload of manual disassembly and reassembly of the drag chain.

[0053] When assembling the keel, align and embed the first connecting protrusion 301 at the head end of the keel block 3 into the first connecting groove 303 at the tail end of the other keel block 3, and insert the conical protrusion of the second connecting protrusion 302 at the head end of the keel block 3 into the second connecting groove 304 at the tail end of the other keel block 3, and then assemble the intermediate chain links according to the required installation length, and finally connect the chain links and the tail chain links at the head and tail of the intermediate chain links to complete the splicing of the drag chain.

[0054] As a specific implementation manner, a plurality of cables 6 are arranged flatly or / and stacked inside the dustproof body 2, and at least two rows of keels are symmetrically arranged at the bottom, top or middle of the plurality of cables 6; the clamp block 1 is detachably arranged on the outer surface of the dustproof body 2, and is used to stably fix the cables 6 and the keels in the dustproof body 2.

[0055] Specifically, a number of cables 6 are laid flat or / and stacked inside the dustproof body 2, and at least two rows of keels are symmetrically arranged at the bottom, top or middle of the cables 6. A stable frame structure is formed by the symmetrically arranged keels, which effectively enhances the bending and torsion resistance of the entire drag chain, and can also effectively resist external vibrations and impacts, which is especially important for equipment that needs to work in a dynamic environment.

[0056] As a specific implementation method, the keel includes a first chain link, an intermediate chain link, and a tail chain link; one end of the intermediate chain link is detachably connected to the first chain link, and the other end of the intermediate chain link is detachably connected to the tail chain link; a clamp connection hole is provided on the clamp block 1;

[0057] The first link is composed of a first bone block 4, the first end of the first bone block 4 is provided with a first end fixing groove 401 for connecting the clamp block 1, and the tail end of the first bone block 4 is provided with a first bone protrusion 402 for connecting the keel block 3 of the middle link;

[0058] The fixture block 1 is provided with a fixture connection hole, and the head end fixing groove 401 is provided with a threaded connection hole, and the head bone block 4 is fixedly connected to the fixture block 1 by bolts;

[0059] The tail link is composed of a coccyx block 5, the head end of the coccyx block 5 is provided with a coccyx groove 502 for connecting to the keel block 3 of the middle link, and the tail end of the coccyx block 5 is provided with a tail end fixed groove 501 for connecting to the clamp block 1;

[0060] A threaded connection hole is provided in the tail end fixed groove 501, and the coccyx block 5 is fixedly connected to the clamp block 1 by bolts.

[0061] Specifically, by disassembling and clamping the head bone block 4 and the coccyx block 5 with the keel block 3 of the middle chain link respectively, and then fixing the head bone block 4 and the coccyx block 5 with the drag chain clamp on the dustproof body 2 respectively by bolts, it is possible to prevent the cable 6 from vibrating and rubbing due to long-term movement with the dustproof body 2, thereby causing the cable to detach from the dustproof body 2, and can also effectively improve the service life and stability of the cable; the specific positions of the keel drag chain and the cable in the dustproof body 2 can also be adjusted according to specific circumstances to perform a variety of level combinations, thereby being suitable for scenarios in different environments in modern industrial production.

[0062] As a specific implementation, the edge of the groove wall of the first connection groove 303 is configured to be chamfered, and the edge of the first connection protrusion 301 is configured to be chamfered.

[0063] Specifically, the chamfered groove wall edge of the first connecting groove 303 of the keel block 3 is inserted into the chamfered edge of the first connecting protrusion 301 of the adjacent keel block 3, and the first connecting groove 303 of the keel block 3 is inserted into the first connecting protrusion 301 of the adjacent keel block 3 by utilizing the structure that the long side of the chamfered trapezoid is larger than the short side. Then, the assembly is performed according to the required installation length, and finally the drag chain splicing is completed.

[0064] Example 2

[0065] like Figure 1-8 As shown, this embodiment discloses a dust-free drag chain with adjustable cable bending angle, comprising a clamp block 1, a dustproof body 2, and a keel; at least two rows of keels are symmetrically arranged inside the dustproof body 2; the clamp block 1 is detachably arranged on the outer surface of the dustproof body 2, and is used to stably sleeve the dustproof body 2 on the outer side of the keel;

[0066] The keel includes an intermediate link, which is composed of a plurality of keel blocks 3 that are mutually clamped head to tail. A first connection protrusion 301 and a second connection protrusion 302 are provided inside the head end of the keel block 3, and a first connection groove 303 and a second connection groove 304 that cooperate with the first connection protrusion 301 and the second connection protrusion 302 of the adjacent keel block 3 are provided at the tail end of the keel block 3.

[0067] The first connecting protrusion 301 of the keel block 3 is in the shape of a half-moon column, and the first connecting groove 303 at the tail end is a wave groove; the first connecting protrusion 301 of the keel block 3 is selected to be hinged in the wave groove of the first connecting groove 303 of the adjacent keel block 3, and the first connecting protrusion 301 of the adjacent keel block 3 can be selected to be fixed along the length direction of the groove of the first connecting groove 303 of the adjacent keel block 3.

[0068] As the drag chain moves with other moving parts of CNC machine tools, automated production lines and other equipment, it may be subjected to torsional forces or irregular stresses, which can easily damage the drag chain.

[0069] As a specific implementation, the protrusion of the second connection protrusion 302 of the keel block 3 is arranged in the second connection groove 304 of the adjacent keel block 3; the adjacent keel blocks 3 are limited in rotation angle by the cooperation between the second connection protrusion 302 and the second connection groove 304;

[0070] A limiting portion 305 is further provided at the leading edge of the keel block 3 , and a protruding side of the limiting portion 305 abuts against the trailing edge of the adjacent keel block 3 .

[0071] Specifically, the limiting portion 305 is in a triangular prism shape. When the drag chain performs mechanical reciprocating motion, the second connecting protrusion 302 of the keel block 3 can limit the rotation angle of the adjacent second connecting groove 304. The convex side of the limiting portion 305 of the keel block 3 abuts against the edge of the adjacent keel block 3 at the rear end and can limit the rotation angle, thereby resulting in the keel drag chain having excellent supporting force, which can effectively increase the rigidity and stability of the keel drag chain;

[0072] By setting multiple rotation limit points between adjacent keel blocks 3, the rigidity and stability of the entire drag chain can be improved, especially when carrying heavier cables, oil pipes, etc., it can better distribute the load and reduce excessive force on a single point. It can also protect the wires and pipes from damage, thereby improving their service life and reliability.

[0073] Example 3

[0074] like Figure 1-8 As shown, this embodiment discloses a dust-free drag chain with adjustable cable bending angle, comprising a clamp block 1, a dustproof body 2, and a keel; at least two rows of keels are symmetrically arranged inside the dustproof body 2; the clamp block 1 is detachably arranged on the outer surface of the dustproof body 2, and is used to stably sleeve the dustproof body 2 on the outer side of the keel;

[0075] The keel includes an intermediate link, which is composed of a plurality of keel blocks 3 that are mutually clamped head to tail. A first connection protrusion 301 and a second connection protrusion 302 are provided inside the head end of the keel block 3, and a first connection groove 303 and a second connection groove 304 that cooperate with the first connection protrusion 301 and the second connection protrusion 302 of the adjacent keel block 3 are provided at the tail end of the keel block 3.

[0076] The first connecting protrusion 301 of the keel block 3 is in the shape of a half-moon column, and the first connecting groove 303 at the tail end is a wave groove; the first connecting protrusion 301 of the keel block 3 is selected to be hinged in the wave groove of the first connecting groove 303 of the adjacent keel block 3, and the first connecting protrusion 301 of the adjacent keel block 3 can be selected to be fixed along the length direction of the groove of the first connecting groove 303 of the adjacent keel block 3.

[0077] As a specific implementation method, when the drag chain is assembled, since the width of the first connecting groove 303 is greater than the thickness of the first connecting protrusion 301, the keel block 3 can be clamped to the adjacent keel block 3 during assembly. The width of the first connecting groove 303 is greater than the thickness of the first connecting protrusion 301 by 2 mm, and the width of the second connecting groove 304 is greater than the thickness of the second connecting protrusion 302 by 1 to 2 mm. This can effectively ensure that the adjacent keel blocks 3 remain stable during the movement of the drag chain, avoid shaking of the adjacent keel blocks 3 and vibration of the chain links, thereby improving the service life and reliability of the drag chain.

[0078] When the drag chain is reciprocating, the length of the drag chain composed of several keel blocks 3 connected end to end is 60 to 9000 mm, and the radius of the running arc can be adjusted to 40 to 90 mm, so that the friction between expansion and contraction can be reduced during the movement of the drag chain, thereby improving the movement smoothness and stability of the drag chain. It can greatly reduce the friction and blocking of the machinery and equipment on the drag chain, reduce downtime for maintenance, reduce the number of frequent replacements, and other time-consuming and labor-intensive aspects of production.

[0079] How it works

[0080] When assembling the keel, align and embed the first connecting protrusion 301 at the head end of the keel block 3 into the first connecting groove 303 at the tail end of the other keel block 3, and insert the second connecting protrusion 302 at the head end of the keel block 3 into the second connecting groove 304 at the tail end of the other keel block 3, and then assemble the intermediate chain links according to the required installation length, and finally connect the chain links and the tail chain links at the head and tail of the intermediate chain links to complete the splicing of the drag chain.

[0081] When CNC machine tools, automated production lines and other equipment need to change the bending angle of the connecting cables for operation, it is only necessary to slide the first connecting protrusion 301 of the keel block 3 along the notch length of the first connecting groove 303 of the adjacent keel block 3 and fix it at different arc positions of the wave notch, so that the cable 6 attached to the dustproof body 2 can be bent at a larger or smaller angle, ensuring the smooth movement of the cable 6 at different angles and directions; a plurality of cables 6 are arranged flatly or / and stacked inside the dustproof body 2, and at least two rows of keels are symmetrically arranged at the bottom, top or middle of the plurality of cables 6. A stable frame structure is formed by the symmetrically arranged keels, which effectively enhances the torsion resistance of the entire drag chain; the adjacent keel blocks 3 limit the rotation angle by the cooperation of the second connecting protrusion 302 and the second connecting groove 304, and the limiting portion 305 of the keel block 3 abuts against the rear edge of the adjacent keel blocks 3 in a convex shape, and a plurality of rotation limit points are set between adjacent keel blocks 3 to effectively improve the rigidity and stability of the entire drag chain.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dust-free drag chain with adjustable cable bending angle, characterized in that: include: A fixture block (1), a dustproof body (2), and a keel; at least two rows of the keels are symmetrically arranged inside the dustproof body (2); the fixture block (1) is detachably arranged on the outer surface of the dustproof body (2) and is used to stably sleeve the dustproof body (2) on the outer side of the keel; The keel comprises an intermediate chain link, which is composed of a plurality of keel blocks (3) that are mutually clamped head to tail, wherein a first connection protrusion (301) and a second connection protrusion (302) are provided inside the head end of the keel block (3), and a first connection groove (303) and a second connection groove (304) are provided at the tail end of the keel block (3) to cooperate with the first connection protrusion (301) and the second connection protrusion (302) of the adjacent keel block (3); The first connecting protrusion (301) of the keel block (3) is in the shape of a half-moon column, and the first connecting groove (303) at the tail end is a wave groove; the first connecting protrusion (301) of the keel block (3) is selected to be correspondingly hinged in the wave groove of the first connecting groove (303) of the adjacent keel block (3), and the first connecting protrusions (301) of the adjacent keel blocks (3) can be selected to be fixedly arranged along the groove length direction of the first connecting groove (303) of the adjacent keel block (3).

2. According to claim 1, the dust-free drag chain with adjustable cable bending angle is characterized in that: The protruding portion of the second connecting protrusion (302) of the keel block (3) is arranged in the second connecting groove (304) of the adjacent keel block (3); the adjacent keel blocks (3) limit the rotation angle by the cooperation between the second connecting protrusion (302) and the second connecting groove (304).

3. The dust-free drag chain with adjustable cable bending angle according to claim 1, characterized in that: The leading edge of the keel block (3) is also provided with a limiting portion (305), and a protruding side of the limiting portion (305) abuts against the trailing edge of the adjacent keel block (3).

4. The dust-free drag chain with adjustable cable bending angle according to claim 1, characterized in that: A plurality of cables are arranged flatly or / and in layers inside the dustproof body (2), and at least two rows of keels are symmetrically arranged at the bottom, top or middle of the plurality of cables; the clamp block (1) is detachably arranged on the outer surface of the dustproof body (2) and is used to stably fix the cables and keels inside the dustproof body (2).

5. The dust-free drag chain with adjustable cable bending angle according to claim 1, characterized in that: The keel comprises a first chain link, an intermediate chain link and a tail chain link; one end of the intermediate chain link is detachably connected to the first chain link, and the other end of the intermediate chain link is detachably connected to the tail chain link; and a clamp connection hole is provided on the clamp block (1).

6. The dust-free drag chain with adjustable cable bending angle according to claim 5, characterized in that: The first link is composed of a first bone block (4), the first end of the first bone block (4) is provided with a first end fixing groove (401) for connecting to a clamp block (1), and the tail end of the first bone block (4) is provided with a first bone protrusion (402) for connecting to a keel block (3) of an intermediate link.

7. The dust-free drag chain with adjustable cable bending angle according to claim 5, characterized in that: The tail link is composed of a coccyx block (5), the head end of the coccyx block (5) is provided with a coccyx groove (502) for connecting to the keel block (3) of the middle link, and the tail end of the coccyx block (5) is provided with a tail end fixed groove (501) for connecting to the clamp block (1).

8. The dust-free drag chain with adjustable cable bending angle according to claim 6, characterized in that: The clamp block (1) is provided with a clamp connection hole, and the head end fixing groove (401) is provided with a threaded connection hole, and the head bone block (4) and the clamp block (1) are fixedly connected by bolts.

9. The dust-free drag chain with adjustable cable bending angle according to claim 7, characterized in that: A threaded connection hole is provided in the tail end fixed groove (501), and the coccyx block (5) and the clamp block (1) are fixedly connected by bolts.

10. The dust-free drag chain with adjustable cable bending angle according to claim 1, characterized in that: The edge of the groove wall of the first connecting groove (303) is configured to be chamfered, and the edge of the first connecting protrusion (301) is configured to be chamfered.

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