A double drag chain system for rotating rack

Abstract

The present invention discloses a double drag chain system for a rotating frame, comprising: a slewing support bracket, installed on the ground; a slewing support assembly, comprising an outer ring and an inner ring, and the outer ring can rotate relative to the inner ring, and the inner ring is installed on the slewing support bracket; a rotating frame, connected to the upper surface of the outer ring; a drag chain base assembly, installed on the ground; a drag chain inner roller assembly, whose lower surface is in rolling contact with the upper surface of the drag chain base assembly, and the upper surface is connected to the rotating frame; a drag chain main body assembly, installed in a space defined by the upper surface of the drag chain base assembly and the outer arc surface of the drag chain inner roller assembly, whose fixed end is connected to the inner arc surface of the slewing support bracket, and whose movable end is connected to the outer arc surface of the drag chain inner roller assembly. The present invention can realize the synchronous, high-speed, and stable rotation of all pipes and cables with the rotating frame within a range of 0-360°, without the need for additional power and without relying on deadweight, and is suitable for the motion connection requirements of vertical rotating frames or rotating machinery pipes and cables that need to rotate around the center at high speed.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a double drag chain system for a rotating rack. Background Art

[0002] Radiotherapy is a very popular technology for tumor treatment all over the world. Protons and heavy ions are the most commonly used ions for cancer treatment. When using ion beams to treat cancer, if only one irradiation direction is used, the normal cells between the skin and the tumor will receive at least 1 / 3 of the tumor radiation dose, causing varying degrees of damage. In order to reduce this damage and increase the focal-to-skin ratio of the treatment, a course of treatment needs to be irradiated from different directions, dividing the total dose into multiple radiation directions, so that the dose received by normal tissues is greatly reduced.

[0003] At present, there are usually two solutions for providing different irradiation angles. One is fixed beam line, that is, an accelerator needs to be equipped with treatment terminals with different irradiation angles. Commonly used are horizontal terminals, vertical terminals and 45-degree terminals. In order to configure these fixed-angle treatment terminals, the terminal beam transmission line is usually designed to be very long, occupying a large area and high cost. The other is to use rotating rack (gantry) technology. The treatment rotating racks currently used internationally are all horizontal structures, that is, the axis of rotation is parallel to the ground. The pipes and cables on the horizontal rotating rack are generally arranged in a single layer and wound around the rotating axis of the rack. Relying on the deadweight and the rack rotation to retract and release the drag chain, the rotating equipment pipe and cable movement connection is realized.

[0004] In recent years, researchers have invented a vertical rotating rack with a rotation axis perpendicular to the ground in order to reduce the construction cost of ion therapy devices and improve treatment efficiency. However, since there is no vertical rotating rack officially put into operation internationally, there is no double drag chain system suitable for vertical rotating racks. The rotation axis of the vertical rotating rack is perpendicular to the ground, and it needs to run back and forth frequently and at high speed during operation. At the same time, the number of pipes and cables of the vertical rotating rack is huge. Due to the limitations of the drag chain's own structure and materials, when the number of pipes and cables doubles, if a single-layer layout is continued, the area of ​​the drag chain entanglement on the equipment will increase, and the drag chain will be damaged due to increased gravity. If it is a double-layer layout, the increased gravity of the pipes and cables will increase wear and even damage the drag chain, and there will also be a phenomenon of two drag chains getting stuck. Therefore, the double drag chain system of the horizontal rotating rack cannot meet the needs of the vertical rotating rack with doubled pipes and cables, large angles and high speed stable operation. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a double drag chain system for a rotating rack, which is designed to protect and pull the pipes and cables required for the equipment on the rotating rack, standardize the movement path of the pipes and cables, and realize the synchronous, high-speed, safe and stable rotation of all pipes and cables with the rack within the range of 0-360°, without the need for additional power and without relying on deadweight, and is suitable for the motion connection requirements of the pipes and cables of a vertical rotating rack or a rotating mechanical rotating machine that needs to rotate at high speed around the center.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a double drag chain system for a rotating frame, comprising: a slewing support bracket, installed on the ground; a slewing support assembly, comprising an outer ring and an inner ring, and the outer ring can rotate relative to the inner ring, and the inner ring is installed on the upper surface of the slewing support bracket; a rotating frame, which is tightly connected to the upper surface of the outer ring and can rotate synchronously with the outer ring, and the rotation axis of the rotating frame is perpendicular to the ground; a drag chain base assembly, which is installed on the ground and located inside the slewing support bracket; a drag chain inner roller The drum assembly, the lower surface of the inner roller assembly of the drag chain is in rolling contact with the upper surface of the drag chain base assembly, and the upper surface of the inner roller assembly of the drag chain is tightly connected to the rotating frame; the drag chain main body assembly is installed in the space defined by the upper surface of the drag chain base assembly and the outer arc surface of the inner roller assembly of the drag chain, and the fixed end of the drag chain main body assembly is tightly connected to the inner arc surface of the slewing bearing bracket, and the movable end of the drag chain main body assembly is tightly connected to the outer arc surface of the inner roller assembly of the drag chain, and the drag chain main body assembly has a drag chain for arranging cables.

[0007] Preferably, the slewing bearing bracket comprises an integrally arranged annular vertical plate and a bottom plate, and its installation method comprises: bolting to the concrete ground through chemical anchor bolts; or, pre-embedding screws in the installation area, and leveling the slewing bearing bracket and then bolting to the ground through the pre-embedded screws; or, pre-embedding steel plates in the installation area, and leveling the slewing bearing bracket and then welding them to the pre-embedded steel plates; or, placing adjustment shims in the installation area, and leveling the slewing bearing bracket and then performing secondary concrete pouring to complete fixation.

[0008] Preferably, an annular mounting surface is provided on the upper portion of the slewing support bracket, and the bottom of the inner ring is fastened to the annular mounting surface of the slewing support bracket; a plurality of stoppers are provided on the circumferential direction of the annular mounting surface of the slewing support bracket, and the stoppers are designed with a negative tolerance for the installation positioning.

[0009] Preferably, the drag chain base assembly comprises a drag chain base support, a drag chain bottom plate, a drag chain outer roller bottom plate, a drag chain inner roller bottom plate, a drag chain foot and an outer connecting plate; a plurality of groups of the drag chain base supports distributed in a ring shape are arranged at the bottom of the drag chain base assembly, and a height-adjustable drag chain foot is arranged at the lower part of each group of the drag chain base supports; a plurality of the drag chain bottom plates, a plurality of the drag chain outer roller bottom plates and a plurality of the drag chain inner roller bottom plates are installed on the upper surface of the drag chain base support, and the drag chain bottom plates, the drag chain outer roller bottom plates and the drag chain inner roller bottom plates are all nested in a circular ring shape and in two layers of high and low, and each type of bottom plates are connected end to end to form an integrated circular ring; a raised first circular arc step is arranged on the outer side of the drag chain bottom plate, and the outer connecting plate is bolted to the first circular arc step.

[0010] As a preference: the drag chain base support comprises an I-beam main body, the upper surface of the drag chain base support is respectively fastened to the lower surface of the drag chain bottom plate, the lower surface of the outer roller bottom plate of the drag chain and the lower surface of the inner roller bottom plate of the drag chain, and the lower surface of the drag chain base support is fastened to a plurality of the drag chain legs;

[0011] The drag chain bottom plate is in the shape of a segmented circular ring, with a plurality of countersunk holes symmetrically arranged at both end surfaces of its upper surface, a raised second circular arc step facing inwardly arranged at its outer arc, and fixing holes symmetrically arranged on the outer surface of the second circular arc step;

[0012] The outer roller bottom plate of the drag chain is in the shape of a segmented circular ring, and a plurality of countersunk holes are symmetrically arranged at both end surfaces of its upper surface;

[0013] The inner roller bottom plate of the drag chain is in the shape of a segmented circular ring, and a plurality of countersunk holes are symmetrically arranged at both end surfaces of its upper surface;

[0014] The outer connecting plate is in a rectangular parallelepiped structure, and its outer surface is provided with countersunk holes with the same number and position as the fixing holes on the outer surface of the second circular arc step.

[0015] Preferably: the inner roller assembly of the drag chain includes an inner bottom plate, a drag chain protective plate, a protective plate connecting piece, a connecting mounting plate, a roller assembly and a guide wheel assembly; a number of the inner bottom plates are connected end to end and are fastened to form a circular ring through a number of the connecting mounting plates, a number of groups of the roller assemblies are fastened to the lower surface of the inner bottom plate in a circular ring shape, and each group of the roller assemblies includes two rollers arranged radially along the inner bottom plate, and the two rollers are respectively in contact with the outer roller bottom plate of the drag chain and the inner roller bottom plate of the drag chain; a number of groups of the guide wheel assemblies are bolted to the lower surface of the inner bottom plate in a circular ring shape, and the guide wheels are located in the middle channel between the outer roller bottom plate of the drag chain and the inner roller bottom plate of the drag chain; a number of the drag chain protective plates are connected end to end and are fastened to form a cylindrical shape through a number of the protective plate connecting pieces, and are concentrically fastened to the upper surface of the inner bottom plate.

[0016] Preferably, the inner bottom plate is in a segmented circular ring shape, and a plurality of fixing holes are symmetrically arranged at both end surfaces of the upper surface of the inner bottom plate for mounting the roller assembly, the guide wheel assembly, the connecting mounting plate and the drag chain protection plate;

[0017] The drag chain protection plate is in the shape of a segmented cylinder, and its upper and lower ends are equilateral angle steels with a certain curvature, and a number of fixing holes are evenly arranged on the surface of the equilateral angle steel; the middle part of the drag chain protection plate is an annular vertical plate with the same thickness as the equilateral angle steel, and the upper and lower end surfaces of the annular vertical plate are tightly connected to one side of the equilateral angle steel at both ends, and a hole for pipes and cables to pass through is arranged in the middle of the annular vertical plate;

[0018] The guide wheel assembly includes a guide wheel connector, a main shaft and a guide wheel. The upper surface of the guide wheel connector is fastened to the lower surface of the inner bottom plate, the main shaft is fastened to the lower surface of the guide wheel connector, and the guide wheel is rotatably mounted on the main shaft.

[0019] As a preference: the main assembly of the drag chain includes a long drag chain, a short drag chain, a mounting plate under the drag chain, a mounting plate on the fixed end of the drag chain and a mounting plate on the movable end of the drag chain; the long drag chain and the short drag chain are symmetrically arranged on the inner and outer sides by at least four drag chains of the same height and width but different lengths, with at least two on one side, respectively having different lengths and turning radii, and there are gaps between the inner edge of the long drag chain with a large radius and the outer edge of the short drag chain with a large radius, and between the outer edge of the long drag chain with a small radius and the inner edge of the short drag chain with a small radius; the outer edge of the long drag chain with a large radius and the second arc on the bottom plate of the drag chain The inner side of the step is in contact, and the outer edge of the long drag chain with a small radius is in contact with the drag chain protective plate; the long drag chain and the short drag chain are both provided with movable vertical partitions to divide the internal space of the long drag chain and the short drag chain into several areas, and the strong current cables, weak current cables, water pipes and air pipes are arranged in each area respectively to realize the zoning arrangement of strong and weak current, water and air pipes; the long drag chain and the short drag chain are respectively fastened to the upper surface of the drag chain bottom plate, the inner arc surface of the slewing bearing bracket and the outer arc surface of the drag chain protective plate through the lower mounting plate of the drag chain, the upper mounting plate of the fixed end of the drag chain and the upper mounting plate of the movable end of the drag chain.

[0020] As a preference: the lower mounting plate of the drag chain is a rectangular parallelepiped structure, the upper surface of which is fastened to the bottom plate of the drag chain and the bottom plate of the inner roller of the drag chain, and the side surface of the lower mounting plate of the drag chain is fastened to the starting end and the terminal end of the bottom of the long drag chain and the short drag chain;

[0021] The upper side of the mounting plate on the fixed end of the drag chain is a first rectangular block, and the first rectangular block is fastened to the starting ends of the upper parts of the long drag chain and the short drag chain; the outer side of the mounting plate on the fixed end of the drag chain is a first arc-shaped plate with an outer diameter the same as the inner diameter of the vertical plate of the slewing support bracket, and the first arc-shaped plate is fastened to the inner arc surface of the vertical plate of the slewing support bracket; the middle part of the mounting plate on the fixed end of the drag chain is a rectangular plate, and the arc surface on one side close to the first arc-shaped plate is a concentric circle with a different radius from the first arc-shaped plate;

[0022] The upper side of the mounting plate on the moving end of the drag chain is a second rectangular block, and the second rectangular block is fastened to the terminals at the upper parts of the long drag chain and the short drag chain; the inner side of the mounting plate on the moving end of the drag chain is a second curved plate with an inner diameter the same as the outer diameter of the drag chain protective plate, and the outer surface of the second curved plate is fastened to the drag chain protective plate; the middle part of the mounting plate on the moving end of the drag chain is a triangular plate, and the curved surface on one side close to the second curved plate is a concentric circle with a different radius from the second curved plate.

[0023] Preferably: it also includes a drag chain guide frame assembly installed on the inner side of the drag chain main body assembly and matching the shape therewith, the drag chain guide frame assembly includes a guide frame body, a first caster and a second caster; the guide frame body is a symmetrical structure composed of an outer ring and an inner ring with the same opening angle, the outer ring and the inner ring are connected as a whole by a semicircle, and the inner edges of the short drag chains with large radius and small radius are in contact with the outer edges of the outer ring and the inner ring respectively; a plurality of first caster connecting plates are evenly distributed radially on the inner side of the lower part of the guide frame body, the lower surface of the first caster connecting plate is fastened to the first caster, and the first caster is in contact with the bottom plate of the drag chain; a plurality of second caster connecting members are evenly distributed radially on the upper surface of the guide frame body, the second caster connecting members are fastened to the second caster on both inner and outer sides, and the second casters on both inner and outer sides of the second caster connecting member are in contact with the inner surface of the inner ring and the outer surface of the drag chain protective plate respectively.

[0024] The present invention adopts the above technical solution, which has the following advantages:

[0025] 1. The drag chain main body component of the present invention adopts a double drag chain structure with a symmetrical arrangement and the same running trajectory around the center. Compared with a single drag chain, it can multiply the loading capacity of pipes and cables, protect and pull the pipes and cables required for the equipment on the rotating rack, and standardize the movement path of the pipes and cables. It is particularly suitable for heavy ion vertical rotating racks with many magnet cables, large cross-sections, and large water pipe diameters. There is a gap between the two drag chains themselves, and there is no wear between the drag chains, thereby extending the service life.

[0026] 2. The double drag chain system for the rotating rack provided by the present invention utilizes the rotation of the rack itself as traction force, does not require additional power, does not rely on the deadweight of pipes and cables, and can achieve 0-360° synchronous, high-speed forward and reverse movement of all pipes and cables along with the rack.

[0027] 3. The double drag chain system for the rotating frame provided by the present invention adopts a guide frame to regulate the movement trajectory of the pipe and cable, and adopts a bidirectional rolling constraint to make it move along the designed path, which greatly reduces the wear of the drag chain and greatly improves the service life.

[0028] 4. The present invention utilizes separators to separate pipes and cables vertically, realizing the principle of separating water pipes and cables, and arranging strong and weak electricity separately. It not only solves the problems of heat dissipation and twisting damage of pipes and cables, but also meets the requirements of electromagnetic compatibility, and can effectively improve the safety, stability and reliability of equipment operation.

[0029] 5. The present invention can solve the problems of long-term dragging, severe wear, severe distortion, short life and electromagnetic interference of the drag chain.

[0030] 6. The present invention is applicable to the motion connection requirements of vertical rotating racks or rotating machinery cables that need to rotate around the center at high speed, and is a universal solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings:

[0032] Figure 1 An axonometric diagram of the overall structure of a double drag chain system for a rotating frame provided in one embodiment of the present invention;

[0033] Figure 2 A top view of the overall structure of a double drag chain system for a rotating frame provided by this embodiment of the present invention;

[0034] Figure 3 An axonometric view of a slewing bearing assembly provided in one embodiment of the present invention;

[0035] Figure 4 A front view of a towline base assembly provided in one embodiment of the present invention;

[0036] Figure 5 A top view of the towline base assembly provided in this embodiment of the present invention;

[0037] Figure 6 for Figure 5 Sectional view of section AA;

[0038] Figure 7 for Figure 4 A partial enlarged view of the middle A;

[0039] Figure 8 An axonometric view of a drag chain main assembly provided by an embodiment of the present invention;

[0040] Fig. 9 An axonometric view of an inner roller assembly of a drag chain provided by an embodiment of the present invention;

[0041] Fig.10 A bottom view of the inner roller assembly of the drag chain provided by the embodiment of the present invention;

[0042] Fig.11 An axonometric view of a drag chain guide frame assembly provided in accordance with an embodiment of the present invention.

[0043] The reference numerals in the figures are as follows:

[0044] 1-slewing bearing bracket; 2-slewing bearing assembly; 3-rotating frame; 4-drag chain base assembly; 5-drag chain main assembly; 6-drag chain inner roller assembly; 7-drag chain guide frame assembly;

[0045] 201-outer ring; 202-inner ring;

[0046] 401-drag chain base support; 402-drag chain bottom plate; 403-drag chain outer roller bottom plate; 404-drag chain inner roller bottom plate; 405-drag chain support foot; 406-outer connecting plate;

[0047] 501-long drag chain; 502-short drag chain; 503-lower mounting plate of drag chain; 504-upper mounting plate of the fixed end of drag chain; 505-upper mounting plate of the moving end of drag chain;

[0048] 601-inner bottom plate; 602-drag chain protection plate; 603-protection plate connector; 604-connecting mounting plate; 605-roller assembly; 606-guide wheel assembly;

[0049] 701 - guide frame body; 702 - first caster; 703 - second caster; 704 - first caster connecting plate; 705 - second caster connecting piece. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the present invention clearer, the specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0051] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] The double drag chain system for a rotating frame provided by the present invention comprises: a slewing support bracket 1, which is installed on the ground; a slewing support assembly 2, which comprises an outer ring 201 and an inner ring 202, and the outer ring 201 can rotate relative to the inner ring 202, and the inner ring 202 is installed on the slewing support bracket 1; a rotating frame 3, which is connected to the upper surface of the outer ring 201; a drag chain base assembly 4, which is installed on the ground; a drag chain inner roller assembly 6, whose lower surface is in rolling contact with the upper surface of the drag chain base assembly 4, and the upper surface is connected to the rotating frame 3; a drag chain main body assembly 5, which is installed in a space defined by the upper surface of the drag chain base assembly 4 and the outer arc surface of the drag chain inner roller assembly 6, and the fixed end of the drag chain main body assembly 5 is connected to the inner arc surface of the slewing support bracket 1, and the movable end is connected to the outer arc surface of the drag chain inner roller assembly 6. The present invention can realize synchronous, high-speed, safe and stable rotation of all pipes and cables with the rotating frame 3 within the range of 0-360 degrees, without the need for additional power and without relying on deadweight, and is suitable for the motion connection requirements of pipes and cables of vertical rotating frames or rotary machinery that needs to rotate at high speed around the center.

[0057] The double drag chain system for a rotating frame provided by an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0058] Embodiment 1:

[0059] See also Figure 1 , Figure 2 The present embodiment provides a double drag chain system for a rotating frame, comprising a slewing support bracket 1, a slewing support assembly 2, a rotating frame 3, a drag chain base assembly 4, a drag chain main body assembly 5, a drag chain inner roller assembly 6 and a drag chain guide frame assembly 7.

[0060] The slewing support bracket 1 is installed on the ground, and an annular mounting surface is provided on the upper part of the slewing support bracket 1. Figure 3The slewing bearing assembly 2 includes an outer ring 201 and an inner ring 202 which are coaxially arranged, and the outer ring 201 can rotate relative to the inner ring 202. The bottom of the inner ring 202 is tightly connected to the annular mounting surface of the slewing bearing bracket 1. The rotating frame 3 is bolted to the upper surface of the outer ring 201, and the outer ring 201 is driven to rotate by the servo motor and the gear assembly, thereby driving the rotating frame 3 to rotate, and the rotation axis of the rotating frame 3 is perpendicular to the ground.

[0061] In particular, a plurality of stoppers are provided on the annular mounting surface of the slewing support bracket 1 in the circumferential direction, and the stoppers are designed with a negative tolerance for installation and positioning of the inner ring 202 .

[0062] As an alternative implementation, see Figure 1 The slewing bearing bracket 1 includes a circular ring-shaped vertical plate and a bottom plate welded together, and a circle of bolt holes is opened on the bottom plate along the circumferential direction. Its installation methods include but are not limited to: bolting to the concrete ground through chemical anchor bolts; or, pre-embedded screws in the installation area, and the slewing bearing bracket 1 is leveled and then bolted to the ground through the pre-embedded screws; or, pre-embedded steel plates in the installation area, and the slewing bearing bracket 1 is leveled and then welded to the pre-embedded steel plates; or, placing adjustment shims in the installation area, and performing secondary concrete pouring after the slewing bearing bracket 1 is leveled to complete the fixation.

[0063] See also Figures 4 to 7 The drag chain base assembly 4 is installed on the ground inside the slewing support 1, and the drag chain base assembly 4 includes a drag chain base support 401, a drag chain bottom plate 402, a drag chain outer roller bottom plate 403, a drag chain inner roller bottom plate 404, a drag chain foot 405 and an outer connecting plate 406. Specifically, at least 16 groups of drag chain base supports 401 distributed in a ring are arranged at the bottom of the drag chain base assembly 4, and a height-adjustable drag chain foot 405 is arranged at the bottom of each group of drag chain base supports 401, which plays a major supporting role. At least 8 drag chain bottom plates 402, at least 8 drag chain outer roller bottom plates 403 and at least 8 drag chain inner roller bottom plates 404 are installed on the upper surface of the drag chain base support 401. The drag chain bottom plates 402, the drag chain outer roller bottom plates 403 and the drag chain inner roller bottom plates 404 are all arranged in a circular ring shape and nested in two layers, and each type of bottom plates are connected end to end to form an integrated circular ring. A raised first arc step is provided on the outer side of the drag chain bottom plate 402, and the outer connecting plate 406 is bolted to the first arc step to play a connecting and limiting role.

[0064] As an alternative implementation, see Figure 7The drag chain base support 401 includes an I-beam main body, the upper surface of which is divided into two layers of high and low with a total of three steps, and a number of reinforcing ribs are arranged at the bottom of each step; the upper surface of the drag chain base support 401 is respectively fastened and connected (such as bolted or welded) to the lower surface of the drag chain bottom plate 402, the lower surface of the drag chain outer roller bottom plate 403, and the lower surface of the drag chain inner roller bottom plate 404. There are several groups of centrally symmetrical bolt holes on both sides of the lower surface of the drag chain base support 401, and the drag chain legs 405 are bolted to the lower surface of the drag chain base support 401.

[0065] In particular, see Figure 5 The drag chain bottom plate 402 is in the shape of a segmented circular ring, and a plurality of countersunk holes are symmetrically arranged at both end surfaces of its upper surface, and a raised second circular arc step is arranged inward at its outer circular arc, and threaded holes are symmetrically arranged on the outer surface of the second circular arc step.

[0066] In particular, the outer roller bottom plate 403 of the drag chain is in the shape of a segmented circular ring, and a plurality of countersunk holes are symmetrically arranged at both end surfaces of its upper surface.

[0067] In particular, the inner roller bottom plate 404 of the drag chain is in the shape of a segmented circular ring, and a plurality of countersunk holes are symmetrically arranged at both end surfaces of its upper surface.

[0068] In particular, the outer connecting plate 406 is a rectangular parallelepiped structure, and its outer surface is provided with countersunk holes with the same number and position as the threaded holes on the outer surface of the second arc step on the drag chain bottom plate 402.

[0069] See also Figure 8The drag chain main assembly 5 adopts a double drag chain structure, including a long drag chain 501, a short drag chain 502, a drag chain lower mounting plate 503, a drag chain fixed end upper mounting plate 504 and a drag chain moving end upper mounting plate 505. Specifically, the long drag chain 501 and the short drag chain 502 are symmetrically arranged on both sides of the inner and outer sides by at least four drag chains with the same height and width but different lengths, and at least two are distributed on one side, respectively having different lengths and turning radii, and there are gaps between the inner edge of the long drag chain 501 with a large radius and the outer edge of the short drag chain 502 with a large radius, and between the outer edge of the long drag chain 501 with a small radius and the inner edge of the short drag chain 502 with a small radius; the outer edge of the long drag chain 501 with a large radius contacts the inner side of the second arc step on the drag chain bottom plate 402, the outer edge of the long drag chain 501 with a small radius contacts the drag chain protection plate 602 of the inner roller assembly 6 of the drag chain, and the inner edge of the short drag chain 502 with a small radius contacts the drag chain guide frame assembly 7. The long drag chain 501 and the short drag chain 502 are both provided with movable vertical partitions (not shown in the figure) to divide the internal space of the long drag chain 501 and the short drag chain 502 into several areas, and each area is respectively arranged with strong and weak current cables, water pipes and air pipes to realize the zoning arrangement of strong and weak current, water and air pipes. The long drag chain 501 and the short drag chain 502 are respectively bolted to the upper surface of the drag chain bottom plate 402 of the drag chain base assembly 4, the inner arc surface of the slewing support bracket 1 and the outer arc surface of the drag chain protection plate 602 of the inner roller assembly 6 of the drag chain through the lower mounting plate 503 of the drag chain, the upper mounting plate 504 of the fixed end of the drag chain and the upper mounting plate 505 of the movable end of the drag chain.

[0070] As an optional implementation, please continue to refer to Figure 8 The lower mounting plate 503 of the drag chain is a rectangular structure with threaded holes on its upper surface, which is bolted to the drag chain bottom plate 402 and the inner roller bottom plate 404 of the drag chain by bolts. The lower mounting plate 503 of the drag chain has threaded holes on its side, which is bolted to the starting end and the end of the bottom of the long drag chain 501 and the short drag chain 502 by bolts.

[0071] In particular, the upper side of the mounting plate 504 on the fixed end of the drag chain is a first rectangular block, which has a plurality of through holes in its center along the long side, and is bolted to the starting ends of the upper parts of the long drag chain 501 and the short drag chain 502 by bolts; the outer side of the mounting plate 504 on the fixed end of the drag chain is a first arc-shaped plate with an outer diameter the same as the inner diameter of the vertical plate of the slewing support bracket 1, and a plurality of through holes are formed on the outer surface of the first arc-shaped plate, and is bolted to the inner arc surface of the vertical plate of the slewing support bracket 1 by bolts; the middle part of the mounting plate 504 on the fixed end of the drag chain is a rectangular plate, and the arc surface on one side close to the first arc-shaped plate is a concentric circle with a different radius from the first arc-shaped plate.

[0072] In particular, the upper side of the mounting plate 505 on the moving end of the drag chain is a second rectangular block, which has a plurality of through holes in the center along the long side and is bolted to the upper terminals of the long drag chain 501 and the short drag chain 502 by bolts; the inner side of the mounting plate 505 on the moving end of the drag chain is a second curved plate with an inner diameter the same as the outer diameter of the drag chain protection plate 602, a plurality of through holes on the outer surface of the second curved plate is bolted to the drag chain protection plate 602 by bolts; the middle part of the mounting plate 505 on the moving end of the drag chain is a triangular plate, and the curved surface on one side close to the second curved plate is a concentric circle with a different radius from the second curved plate.

[0073] In particular, according to the actual operating conditions of the long drag chain 501 and the short drag chain 502 , the materials of the long drag chain 501 and the short drag chain 502 can be set to steel, steel-aluminum, plastic, stainless steel, nylon, etc.

[0074] See also Fig. 9 , Fig.10 The inner roller assembly 6 of the drag chain includes an inner bottom plate 601, a drag chain protection plate 602, a protection plate connector 603, a connection mounting plate 604, a roller assembly 605 and a guide wheel assembly 606. Specifically, a plurality of inner bottom plates 601 are connected end to end and bolted into a ring shape through a plurality of connection mounting plates 604, a plurality of groups of roller assemblies 605 are bolted to the lower surface of the inner bottom plate 601 in a ring shape, and each group of roller assemblies 605 includes two rollers arranged radially along the inner bottom plate 601, and the two rollers are respectively in contact with the outer roller bottom plate 403 and the inner roller bottom plate 404 of the drag chain base assembly 4, and play a supporting role; a plurality of groups of guide wheel assemblies 606 are bolted to the lower surface of the inner bottom plate 601 in a ring shape, and the guide wheels thereof are in the middle channel between the outer roller bottom plate 403 and the inner roller bottom plate 404 of the drag chain base assembly 4, and play a guiding role. A plurality of drag chain protection plates 602 are connected end to end and bolted into a cylindrical shape through a plurality of protection plate connectors 603 , and are concentrically bolted to the upper surface of the inner bottom plate 601 .

[0075] As an alternative implementation, see Fig. 9 The inner bottom plate 601 is in the shape of a segmented circular ring, and a number of threaded holes and countersunk holes are symmetrically arranged at both end surfaces of the upper surface of the inner bottom plate 601 for installing the roller assembly 605, the guide wheel assembly 606, the connecting mounting plate 604 and the drag chain protection plate 602.

[0076] In particular, the drag chain protection plate 602 is in the shape of a segmented cylinder, and its upper and lower ends are equilateral angle steels with a certain curvature, and a number of threaded holes are evenly arranged on the surface of the equilateral angle steel; the middle part of the drag chain protection plate 602 is an annular vertical plate with the same thickness as the equilateral angle steel, and the upper and lower end faces of the annular vertical plate are welded to one side of the equilateral angle steels at both ends, and a rectangular hole is arranged in the middle of the annular vertical plate for weight reduction and the passage of pipes and cables; a number of reinforcing ribs are arranged inside the drag chain protection plate 602.

[0077] In particular, the protective plate connecting member 603 is a rectangular plate with a certain curvature, and the radius of its outer curved surface is the same as the radius of the inner curved surface of the annular vertical plate of the drag chain protective plate 602.

[0078] As an alternative implementation, see Fig.10 The connecting and mounting plate 604 is a rectangular plate, and its surface is provided with countersunk holes with the same number and position as the threaded holes provided on the inner bottom plate 601 for mounting the connecting and mounting plate.

[0079] In particular, the guide wheel assembly 606 includes a guide wheel connector, a main shaft and a guide wheel. The upper surface of the guide wheel connector is bolted to the lower surface of the inner bottom plate 601, the main shaft is welded to the lower surface of the guide wheel connector, and the guide wheel is rotatably mounted on the main shaft.

[0080] See also Fig.11 The tow chain guide frame assembly 7 includes a guide frame body 701, a first caster 702 and a second caster 703. Specifically, the guide frame body 701 is a symmetrical structure consisting of an outer ring and an inner ring with the same opening angle, and the outer ring and the inner ring are connected as a whole by an arc plate; the inner edges of the short tow chains 502 with large radius and small radius are in contact with the outer edges of the outer ring and the inner ring of the guide frame body 701 respectively, and the guide frame body 701 is used to limit the running tracks of the long tow chains 501 and the short tow chains 502 when the tow chains are retracted and released, so as to ensure that the long tow chains 501 and the short tow chains 502 run smoothly without being stuck; a plurality of first caster links are evenly distributed along the radial direction on the inner side of the lower part of the guide frame body 701 Connecting plate 704, the first caster connecting plate 704 is bolted with the first caster 702 on the lower surface, and the first caster 702 is in contact with the drag chain bottom plate 402 of the drag chain base assembly 4; the upper surface of the guide frame body 701 is evenly distributed with a plurality of second caster connecting members 705 along the radial direction, and the second caster 703 is bolted on both the inner and outer sides of the second caster connecting member 705, and the second casters 703 on both the inner and outer sides of the second caster connecting member 705 are in contact with the inner surface of the inner ring 202 of the slewing bearing assembly 2 and the outer surface of the drag chain protective plate 602 of the drag chain inner roller assembly 6 respectively.

[0081] Embodiment 2:

[0082] When the double drag chain system for the rotating frame provided in the above embodiment 1 is used, it includes the following steps:

[0083] S100. According to the route of the pipe and cable, arrange the pipe and cable into the main assembly 5 of the drag chain in sequence according to the line sequence of the pipe and cable in the drag chain, and ensure that the pipe and cable are connected neatly at the equipment end without crossing or overlapping;

[0084] S200. Install the drag chain base assembly 4 to the designed position, and then hoist the drag chain inner roller assembly 6 to complete the installation of the drag chain base assembly 4 and the drag chain inner roller assembly 6;

[0085] S300. Use a dedicated tool to hoist the drag chain main assembly 5 (including the cable) onto the drag chain base assembly 4, and fix the fixed end and the movable end of the drag chain main assembly 5 to the inner surface of the inner ring 202 and the outer arc surface of the drag chain inner roller assembly 6 respectively;

[0086] S400. The drag chain guide frame assembly 7 is hoisted onto the drag chain base assembly 4, and then the limit position of the starting end of the drag chain main assembly 5 is adjusted to the zero position of the rotating frame 3, and finally the inner roller assembly 6 of the drag chain is connected to the rotating frame 3;

[0087] S500. When the rotating frame 3 rotates counterclockwise, the long drag chain 501 (small radius) and the short drag chain 502 (small radius) on the left side of the inner roller assembly 6 of the wound drag chain will be gradually released as the inner roller assembly 6 of the drag chain rotates. The released long drag chain 501 and the short drag chain 502 will fit along the inner wall of the slewing support 1, so that the circumference of the long drag chain 501 (large radius) and the short drag chain 502 (large radius) becomes longer until they rotate to the limit position. During this period, due to the existence of the drag chain guide frame assembly 7, the long drag chain 501 and the short drag chain 502 with large radius and small radius will maintain a fixed running track, so that the long drag chain 501 and the short drag chain 502 can run smoothly.

[0088] S600. At the same time, the long drag chain 501 and the short drag chain 502 attached to the inner wall of the slewing support 1 on the right side will gradually shorten, and the shortened part will be wrapped around the outer wall of the inner roller assembly 6 of the drag chain, thereby realizing the clockwise 0-360° rotation of the double drag chain system. When the rotating frame 3 rotates clockwise, the principle is the same, so it will not be repeated.

[0089] Since the pipes and cables are inside the long drag chain 501 and the short drag chain 502, when the long drag chain 501 and the short drag chain 502 move, the pipes and cables inside will be driven to move along the same running trajectory, and the pipes and cables inside will be retracted and released along with the long drag chain 501 and the short drag chain 502, thereby realizing 360° synchronous, high-speed forward and reverse movement of the pipes and cables along with the rotating frame 3.

[0090] In particular, the internal cables of the double drag chain system are all flexible cables, and the inlet and outlet positions of the double drag chain system are equipped with transfer boxes for connecting conventional cables with the internal cables of the double drag chain system, which can reduce costs, facilitate maintenance, and meet the process requirements for the connection of cables and pipes of accelerator equipment.

[0091] In particular, for the stable operation test of the double drag chain system, when the rotating frame 3 is in high-speed and low-speed reciprocating motion, and the corresponding medium is transmitted in the pipe and cable, the double drag chain system rotates smoothly with the rotating frame 3 without jamming, and its own rotation angle is greater than or equal to the rotation angle of the extreme rotation position of the rotating frame 3. It is considered that the double drag chain system is operating stably.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A double drag chain system for a rotating frame, characterized in that: include: The slewing support bracket is installed on the ground and includes an annular vertical plate and a bottom plate which are integrally arranged; A slewing bearing assembly, comprising an outer ring and an inner ring, wherein the outer ring can rotate relative to the inner ring, and the inner ring is mounted on the upper surface of the slewing bearing bracket; A rotating frame is firmly connected to the upper surface of the outer ring and can rotate synchronously with the outer ring, and the rotating axis of the rotating frame is perpendicular to the ground; The drag chain base assembly is installed on the ground and is located inside the slewing bearing bracket; A drag chain inner roller assembly, wherein the lower surface of the drag chain inner roller assembly is in rolling contact with the upper surface of the drag chain base assembly, and the upper surface of the drag chain inner roller assembly is tightly connected to the rotating frame; The drag chain main body component is installed in the space defined by the upper surface of the drag chain base component and the outer arc surface of the inner roller component of the drag chain, and the fixed end of the drag chain main body component is tightly connected to the inner arc surface of the slewing support bracket, and the moving end of the drag chain main body component is tightly connected to the outer arc surface of the inner roller component of the drag chain, and the drag chain main body component has a drag chain for arranging cables; The drag chain base assembly comprises a drag chain base support, a drag chain bottom plate, an outer roller bottom plate of the drag chain, an inner roller bottom plate of the drag chain, a drag chain foot and an outer connecting plate; a plurality of groups of the drag chain base supports distributed in a ring shape are arranged at the bottom of the drag chain base assembly, and the lower part of each group of the drag chain base supports is provided with the height-adjustable drag chain foot; a plurality of the drag chain bottom plates, a plurality of the outer roller bottom plates of the drag chain and a plurality of the inner roller bottom plates of the drag chain are installed on the upper surface of the drag chain base support, and the drag chain bottom plates, the outer roller bottom plates of the drag chain and the inner roller bottom plates of the drag chain are all nested in a circular ring shape and in two layers of high and low, and each type of bottom plates are connected end to end to form an integrated circular ring; a raised first circular arc step is arranged on the outer side of the drag chain bottom plate, and the outer connecting plate is bolted to the first circular arc step; The inner roller assembly of the drag chain includes an inner bottom plate, a drag chain guard plate, a guard plate connecting piece, a connecting mounting plate, a roller assembly and a guide wheel assembly; a plurality of the inner bottom plates are connected end to end and are fastened to form a circular ring through a plurality of the connecting mounting plates, and a plurality of groups of the roller assemblies are fastened to the lower surface of the inner bottom plate in the shape of a circular ring, and each group of the roller assemblies includes two rollers arranged radially along the inner bottom plate, and the two rollers are respectively in contact with the outer roller bottom plate of the drag chain and the inner roller bottom plate of the drag chain; a plurality of groups of the guide wheel assemblies are bolted to the lower surface of the inner bottom plate in the shape of a circular ring, and the guide wheels are located in the middle channel between the outer roller bottom plate of the drag chain and the inner roller bottom plate of the drag chain; a plurality of the drag chain guard plates are connected end to end and are fastened to form a cylindrical shape through a plurality of the guard plate connecting pieces, and are concentrically fastened to the upper surface of the inner bottom plate; The main assembly of the drag chain includes a long drag chain, a short drag chain, a mounting plate under the drag chain, a mounting plate on the fixed end of the drag chain, and a mounting plate on the movable end of the drag chain; the long drag chain and the short drag chain are symmetrically arranged on the inner and outer sides by at least four drag chains of the same height and width but different lengths, with at least two on one side, respectively having different lengths and turning radii, and there are gaps between the inner edge of the long drag chain with a large radius and the outer edge of the short drag chain with a large radius, and between the outer edge of the long drag chain with a small radius and the inner edge of the short drag chain with a small radius; the outer edge of the long drag chain with a large radius and the inner edge of the second arc step on the bottom plate of the drag chain are spaced apart. Side contact, the outer edge of the long drag chain with a small radius is in contact with the drag chain protective plate; the long drag chain and the short drag chain are both provided with movable vertical partitions to divide the internal space of the long drag chain and the short drag chain into several areas, and each area is respectively arranged with strong and weak current cables, water pipes and air pipes to realize the zoning arrangement of strong and weak current, water and air pipes; the long drag chain and the short drag chain are respectively fastened to the upper surface of the drag chain bottom plate, the inner arc surface of the slewing support bracket and the outer arc surface of the drag chain protective plate through the lower mounting plate of the drag chain, the upper mounting plate of the fixed end of the drag chain and the upper mounting plate of the movable end of the drag chain; It also includes a drag chain guide frame assembly installed on the inner side of the drag chain main body assembly and matching the shape therewith, the drag chain guide frame assembly includes a guide frame body, a first caster and a second caster; the guide frame body is a symmetrical structure composed of an outer ring and an inner ring with the same opening angle, the outer ring and the inner ring are connected as a whole by a semicircle, and the inner edges of the short drag chains with large radius and small radius are in contact with the outer edges of the outer ring and the inner ring respectively; a plurality of first caster connecting plates are evenly distributed radially on the inner side of the lower part of the guide frame body, the lower surface of the first caster connecting plate is fastened to the first caster, and the first caster is in contact with the bottom plate of the drag chain; a plurality of second caster connecting members are evenly distributed radially on the upper surface of the guide frame body, the second caster connecting members are fastened to the second caster on both inner and outer sides, and the second casters on both inner and outer sides of the second caster connecting member are in contact with the inner surface of the inner ring and the outer surface of the drag chain protective plate respectively.

2. The double drag chain system for a rotating frame according to claim 1, characterized in that: The installation method of the slewing bearing bracket includes: bolting to the concrete ground through chemical anchor bolts; or, pre-embedding screws in the installation area, leveling the slewing bearing bracket and then bolting to the ground through the pre-embedded screws; or, pre-embedding steel plates in the installation area, leveling the slewing bearing bracket and then welding them to the pre-embedded steel plates; or, placing adjustment shims in the installation area, leveling the slewing bearing bracket and then performing secondary concrete pouring to complete the fixation.

3. The double drag chain system for a rotating frame according to claim 1, characterized in that: An annular mounting surface is provided on the upper portion of the slewing support bracket, and the bottom of the inner ring is tightly connected to the annular mounting surface of the slewing support bracket; a plurality of stoppers are provided on the circumferential direction of the annular mounting surface of the slewing support bracket, and the stoppers are designed with a negative tolerance for installation and positioning of the inner ring.

4. The double drag chain system for a rotating frame according to claim 1, characterized in that: The drag chain base support comprises an I-beam main body, the upper surface of the drag chain base support is respectively fastened to the lower surface of the drag chain bottom plate, the lower surface of the outer roller bottom plate of the drag chain and the lower surface of the inner roller bottom plate of the drag chain, and the lower surface of the drag chain base support is fastened to a plurality of the drag chain legs; The drag chain bottom plate is in the shape of a segmented circular ring, with a plurality of countersunk holes symmetrically arranged at both end surfaces of its upper surface, a raised second circular arc step facing inwardly arranged at its outer arc, and fixing holes symmetrically arranged on the outer surface of the second circular arc step; The outer roller bottom plate of the drag chain is in the shape of a segmented circular ring, and a plurality of countersunk holes are symmetrically arranged at both end surfaces of its upper surface; The inner roller bottom plate of the drag chain is in the shape of a segmented circular ring, and a plurality of countersunk holes are symmetrically arranged at both end surfaces of its upper surface; The outer connecting plate is in a rectangular parallelepiped structure, and its outer surface is provided with countersunk holes with the same number and position as the fixing holes on the outer surface of the second circular arc step.

5. The double drag chain system for a rotating frame according to claim 1, characterized in that: The inner bottom plate is in the shape of a segmented circular ring, and a plurality of fixing holes are symmetrically arranged at both end surfaces of the upper surface of the inner bottom plate for installing the roller assembly, the guide wheel assembly, the connecting mounting plate and the drag chain protection plate; The drag chain protection plate is in the shape of a segmented cylinder, and its upper and lower ends are equilateral angle steels with a certain curvature, and a number of fixing holes are evenly arranged on the surface of the equilateral angle steel; the middle part of the drag chain protection plate is an annular vertical plate with the same thickness as the equilateral angle steel, and the upper and lower end surfaces of the annular vertical plate are tightly connected to one side of the equilateral angle steel at both ends, and a hole for pipes and cables to pass through is arranged in the middle of the annular vertical plate; The guide wheel assembly includes a guide wheel connector, a main shaft and a guide wheel. The upper surface of the guide wheel connector is fastened to the lower surface of the inner bottom plate, the main shaft is fastened to the lower surface of the guide wheel connector, and the guide wheel is rotatably mounted on the main shaft.

6. The double drag chain system for a rotating frame according to claim 1, characterized in that: The lower mounting plate of the drag chain is a rectangular parallelepiped structure, the upper surface of which is fastened to the bottom plate of the drag chain and the bottom plate of the inner roller of the drag chain, and the side surface of the lower mounting plate of the drag chain is fastened to the starting end and the terminal end of the bottom of the long drag chain and the short drag chain; The upper side of the mounting plate on the fixed end of the drag chain is a first rectangular block, and the first rectangular block is fastened to the starting ends of the upper parts of the long drag chain and the short drag chain; the outer side of the mounting plate on the fixed end of the drag chain is a first arc-shaped plate with an outer diameter the same as the inner diameter of the vertical plate of the slewing support bracket, and the first arc-shaped plate is fastened to the inner arc surface of the vertical plate of the slewing support bracket; the middle part of the mounting plate on the fixed end of the drag chain is a rectangular plate, and the arc surface on one side close to the first arc-shaped plate is a concentric circle with a different radius from the first arc-shaped plate; The upper side of the mounting plate on the moving end of the drag chain is a second rectangular block, and the second rectangular block is fastened to the terminals at the upper parts of the long drag chain and the short drag chain; the inner side of the mounting plate on the moving end of the drag chain is a second curved plate with an inner diameter the same as the outer diameter of the drag chain protective plate, and the outer surface of the second curved plate is fastened to the drag chain protective plate; the middle part of the mounting plate on the moving end of the drag chain is a triangular plate, and the curved surface on one side close to the second curved plate is a concentric circle with a different radius from the second curved plate.

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