A weight adjusting device for small boring and milling machine

Abstract

The application provides a small boring and milling machine counterweight adjusting device, which comprises a column, a boring box and a counterweight box, a steel wire rope mechanism, a fixed wheel fixing frame, a three-point wheel mechanism, a fixed wheel mechanism and a steel wire rope, the steel wire rope mechanism is fixedly installed on the top of the column and is provided with parallel first and second sliding channels, the fixed wheel fixing frame is fixedly installed on the boring box, the three-point wheel mechanism is installed on the fixed wheel fixing frame and is provided with a hanging wheel, the fixed wheel mechanism is fixedly connected with a counterweight block in the counterweight box, one end of the steel wire rope is fixed on the fixed wheel mechanism, and the other end of the steel wire rope is sequentially threaded through the first sliding channel, passes around the hanging wheel, passes through the second sliding channel and is fixedly connected with the fixed wheel mechanism, and the steel wire rope is used to replace the existing counterweight chain, which can reduce the probability of damage of parts and facilitate observation of the wear condition of the steel wire rope.

Description

Technical Field

[0001] This invention relates to the field of counterweight technology for boring and milling machines, and specifically to a counterweight adjustment device for a small boring and milling machine. Background Technology

[0002] Boring and milling machines are a common machining tool used in the machining industry. They combine the functions of boring and milling machines, resulting in higher machining efficiency and better precision, which greatly improves product quality and labor efficiency.

[0003] Small boring and milling machines typically use a single chain to connect the boring box and the counterweight. During use, the chain plates or connecting pins often wear down or become fatigued, leading to chain damage and breakage, causing the counterweight to fall and injure the slide table. The chain has many components, and damage and breakage are not easily detected before they occur, making falls and injuries uncontrollable. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a counterweight adjustment device for a small boring and milling machine to improve the technical problem that the existing counterweight adjustment device for boring and milling machines is not easy to detect before the chain breaks.

[0005] To achieve the above and other related objectives, the present invention provides a counterweight adjustment device for a small boring and milling machine, comprising a column, a boring box, and a counterweight box. The boring box is slidably mounted on one side of the column in a vertical direction, and the counterweight box is fixedly mounted on the other side of the column and has a counterweight block that slides in a vertical direction. The small boring and milling machine counterweight adjustment device further comprises: a wire rope mechanism, a fixed wheel fixing frame, a three-point wheel mechanism, a fixed wheel mechanism, and a wire rope. The wire rope mechanism is fixedly mounted on the top of the column and has a first slide rail and a second slide rail arranged in parallel. The fixed wheel fixing frame is fixedly mounted on the boring box. The three-point wheel mechanism is mounted on the fixed wheel fixing frame and is provided with a hanging wheel. The fixed wheel mechanism is fixedly connected to the counterweight block in the counterweight box. One end of the wire rope is fixed to the fixed wheel mechanism, and the other end of the wire rope passes sequentially through the first slide rail, around the hanging wheel, through the second slide rail, and is fixedly connected to the fixed wheel mechanism.

[0006] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the three-point wheel mechanism further includes at least one reducing wheel. At least one of the reducing wheels is disposed on the fixed wheel fixing frame and squeezes the wire rope on one or both sides of the hanging wheel to reduce the distance between the wire ropes on both sides of the hanging wheel.

[0007] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, there are two reduction wheels, which are symmetrically arranged on both sides of the change gear.

[0008] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the change wheel and / or the reduction wheel are rotatably mounted on the fixed wheel fixing frame, and the edge of the change wheel is provided with a wire rope limiting groove.

[0009] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the bending radius of the wire rope at the compression point of the pulley is smaller than the bending radius of the wire rope on the change wheel.

[0010] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the center distance between the two steel wire ropes threaded between the two reduction pulleys is consistent with the distance between the first slide rail and the second slide rail.

[0011] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the wire rope mechanism includes a wire rope wheel bracket and a wire rope wheel. The wire rope wheel is rotatably connected to the wire rope wheel bracket, and the first slide rail and the second slide rail are coaxially arranged on the wire rope wheel.

[0012] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, a wire rope guide groove is provided on the rim of the pulley, and the wire rope slide is provided in the guide groove.

[0013] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the bottom diameter of the wire rope guide groove is equal to the bottom diameter of the wire rope limiting groove.

[0014] In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the two steel wire ropes extending from both sides of the change wheel form an included angle of 40-60 degrees after being squeezed by the pulleys on both sides.

[0015] This invention, through the cooperation of a wire rope, a wire rope mechanism, a three-point wheel mechanism, a fixed wheel fixing frame, and a fixed wheel mechanism, achieves a transmission method that replaces the original chain with a wire rope. On the one hand, it reduces the number of stress-bearing components and the probability of damage. On the other hand, the wire rope's wear is easily observed during sliding, allowing maintenance personnel to quickly and conveniently check for breaks or other issues. This solves the problem of difficulty in detecting breaks in the original chain or its internal pins, thus improving safety. Furthermore, the addition of a hanging wheel allows for the use of two strands of the wire rope after it undergoes a U-shaped bend, further enhancing the safety performance of the adjustment device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a top view of the mounting structure of the present invention;

[0019] Figure 3 For the present invention Figure 1 Partial schematic diagram at point A in the middle;

[0020] Figure 4 This is a schematic diagram of the fixed wheel fixing frame structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the fixed frame structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the fixed wheel frame structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the reduced-pitch wheel structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the pulley structure of the present invention;

[0025] Figure 9 This is a schematic diagram of the wire rope support structure of the present invention;

[0026] Figure 10 This is a top view schematic diagram of the wire rope support structure of the present invention;

[0027] Figure 11 This is a schematic diagram of the sprocket counterweight support structure of the present invention;

[0028] Figure 12 for Figure 4 A magnified view of a portion of region A in the middle.

[0029] Component designation explanation

[0030] 100. Wire rope mechanism; 110. Wire rope pulley; 111. First slide rail; 112. Second slide rail; 120. Wire rope pulley axle; 130. Wire rope pulley bracket; 131. Bracket base plate; 132. Bracket reinforcing rib; 133. First bracket upright plate; 134. Shaft hole; 135. Second bracket upright plate; 136. Rib plate; 137. Bracket connecting plate; 138. Bracket top plate; 200. Fixed wheel fixing frame; 210. Fixed frame body; 211. Front upright plate; 212. Rear upright plate; 213. Reduction wheel hole; 214. Hanging wheel hole; 215. Threaded hole; 216. Base plate; 220. Conical base; 230. First threaded post; 240. First locking nut; 300. Three-point wheel mechanism; 310. Retractable pulley; 311. Wire rope guide groove; 312. Retractable pulley center hole; 320. First pin; 330. Change wheel; 331. Wire rope limiting groove; 332. Change wheel center hole; 340. Second pin; 400. Fixed wheel mechanism; 410. Fixed wheel; 420. Fixed wheel frame; 421. Fixed wheel connecting hole; 423. Fixed wheel frame upright plate; 424. Fixed wheel frame intermediate plate; 425. Fixed wheel frame base plate; 430. Second threaded post; 440. Second locking nut; 500. Wire rope; 600. Wire rope lock; 700. Column; 800. Drive mechanism; 900. Boring box; 1000. Counterweight box; 1100. Chain counterweight bracket; 1200. Gap space. Detailed Implementation

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0032] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in the present invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, devices, and materials similar to or equivalent to those described, used, or made of materials in the embodiments of this invention.

[0033] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of the invention.

[0034] Please see Figures 1 to 11 This invention provides a counterweight adjustment device for a small boring and milling machine, comprising a column 700, a boring box 900, and a counterweight box 1000. The boring box 900 is slidably mounted on one side of the column 700 in a vertical direction, and the counterweight box 1000 is fixedly mounted on the other side of the column 700 and has a counterweight block that slides in a vertical direction. The counterweight adjustment device for the small boring and milling machine further includes: a wire rope mechanism 100, a fixed wheel fixing frame 200, and a three-point wheel mechanism 300. The system comprises a fixed wheel mechanism 400 and a wire rope 500. The wire rope mechanism 100 is fixedly installed on the top of the column 700 and has a first slide rail 111 and a second slide rail 112 arranged in parallel. The fixed wheel fixing frame 200 is fixedly installed on the boring box 900. The three-point wheel mechanism 300 is installed on the fixed wheel fixing frame 200 and is provided with a hanging wheel 330. The fixed wheel mechanism 400 is fixedly connected to the counterweight block in the counterweight box 1000. Next, one end of the wire rope 500 is fixed to the fixed wheel mechanism 400, and the other end of the wire rope 500 passes through the first slide rail 111, around the hanging wheel 330, through the second slide rail 112, and is fixedly connected to the fixed wheel mechanism 400. The chain and counterweight bracket are replaced by the wire rope 500 and the wire rope mechanism 100. The two ends of the wire rope 500 are respectively connected to the three-point wheel mechanism 300, the fixed wheel fixing frame 200, and the fixed wheel mechanism 400. The connection points between the fixed wheel fixing frame 200 and the boring box 900, and between the fixed wheel mechanism 400 and the counterweight block in the counterweight box 1000, are consistent with the connection points between the original chain and the counterweight bracket and the boring box 900 and the counterweight block. This ensures that the lifting point position remains unchanged. The use of the wire rope 500 to replace the original chain transmission method facilitates the maintenance of the equipment by the maintenance personnel and avoids the fall situation caused by the inability to effectively observe the damage of the chain plate or the chain pin.

[0035] Please see Figure 1 , Figure 2 , Figure 4 , Figure 5In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the fixed wheel fixing frame 200 includes a fixing frame body 210 and a first threaded post 230. The fixing frame body 210 is fixedly connected to the first threaded post 230. The fixing frame body 210 has two reduction wheel holes 213 and one gear hole 214. The reduction wheel holes 213 are symmetrically distributed on both sides of the gear hole 214. A conical base 220 is fixedly installed on the lower part of the fixing frame body 210. The conical base 220 is fixedly connected to the first threaded post 230. The fixed connection method can be welding or bolt connection. A first locking nut 240 is threadedly connected to the first threaded post 230. The first threaded post 230 is threadedly fixedly connected to the boring box 900. The connection is then locked by the first locking nut 240, so that the fixed wheel fixing frame 200 and the boring box 900 are fixedly connected. It should be noted that in other embodiments, the fixed frame 210 may also have only one reduced-pitch wheel hole 213 on one side of the hanging wheel hole 214.

[0036] Please see Figure 2 , Figure 4 , Figure 10 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the wire rope mechanism 100 includes a wire rope wheel 110, a wire rope wheel shaft 120, and a wire rope wheel bracket 130. The wire rope wheel bracket 130 is fixedly connected to the wire rope wheel shaft 120, and the wire rope wheel shaft 120 is rotatably connected to the wire rope wheel 110 through a slewing bearing. The wire rope 500 is wound on the wire rope wheel 110. The wire rope wheel bracket 130 is fixedly installed on the top of the column 700. The wire rope wheel 110 has a first slide rail 111 and a second slide rail 112 coaxially machined on it for placing the wire rope 500. The forward and reverse rotation of the wire rope wheel 110 drives the wire rope 500 to achieve bidirectional movement, thereby driving the counterweight block to rise and fall, completing the rising or falling action of the boring box 900 in the counterweight state.

[0037] Please see Figure 2 , Figure 4 and Figure 5In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the three-point wheel mechanism 300 further includes a reducing wheel 310, a first pin 320, and a second pin 340. The reducing wheel 310 is rotatably connected to the first pin 320, and the first pin 320 is fixedly connected to the reducing wheel hole 213. The changing wheel 330 is rotatably connected to the second pin 340, and the second pin 340 is fixedly connected to the changing wheel hole 214. The inner side of the reducing wheel 310 is slidably connected to the wire rope 500. The two reducing wheels 310 are used to adjust the weight of the machine. The spacing of the wire rope 500 of the pulley 330 is reduced, thereby effectively avoiding the interference between the installation position of the wire rope pulley bracket 130 and the drive mechanism 800 of the boring machine 900 after the size of the wire rope pulley bracket 130 is increased, without increasing the spacing between the first slide rail 111 and the second slide rail 112, and without changing the lifting point. At the same time, it can also achieve the optimal design of the diameter of the wire rope 500 and the diameter of the wire rope pulley 110, which maximizes the service life and safety factor of the wire rope and effectively reduces the occurrence of safety accidents such as counterweight damage to the slide. In addition, since both the pulley and the hanging pulley are rotatably connected to the fixed frame 210, during the initial installation of a single wire rope, the wire rope, after being bent into a U-shape by the hanging pulley 330, can be adjusted by the automatic rotation of the hanging pulley 330 and the pulley 310 of the three-point wheel mechanism, so as to achieve uniform load distribution on the single double-strand wire rope. The rotation setting of the hanging pulley 330 and the pulley 310 reduces the sliding wear between the wire rope and the hanging pulley 330 and the pulley 310 during the automatic balancing process, thereby improving the service life of the wire rope 500. When the load of the two wire ropes is balanced, the wire rope 500, the pulley 310 and the hanging pulley 330 are in a relatively stationary state.

[0038] Please see Figure 4 and Figure 8 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the edge of the change wheel 330 is machined with a wire rope limiting groove 331. The size of the wire rope limiting groove 331 matches the diameter of the wire rope 500. The cross-section of the wire rope limiting groove 331 can be any geometric shape that can accommodate the wire rope 500, such as rectangular, semi-circular, or trapezoidal. In this embodiment, in order to increase the stability of the wire rope 500 during transmission, the wire rope limiting groove 331 is a semi-circular arc structure.

[0039] Please see Figure 4 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the bending radius of the wire rope 500 at the compression point of the reducing wheel 310 is smaller than the bending radius of the wire rope 500 on the changing wheel 330. This arrangement allows the reducing wheel 310 to reduce the compression and bending damage of the wire rope 500 at the compression point while simultaneously reducing the distance between the two wire ropes 500.

[0040] Please see Figure 4 and Figure 10 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the center distance between the two strands of steel wire rope 500 threaded between the two pulleys 310 is (e.g., Figure 4 The center distance between the middle dimension a) and the first slide rail 111 and the second slide rail 112 (as shown in the figure) Figure 4 (as shown in dimension b). This configuration allows for vertical lifting of the two wire ropes 500 during use, reducing the probability of external pulling and oblique dragging during the operation of the wire ropes 500. This further improves the stress state of the wire ropes 500 during lifting, thereby increasing the service life of the wire ropes 500.

[0041] Please see Figure 4 and Figure 7 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, a wire rope guide groove 311 is provided on the rim of the reduction wheel 310. The wire rope guide groove 311 is coaxially disposed on the reduction wheel 310, and the position of the wire rope guide groove 311 corresponds to the position of the wire rope 500 on the same side. The wire rope guide groove 311 and the wire rope 500 slide against each other. The cross-section of the wire rope guide groove 311 can be any geometric shape that can accommodate the wire rope 500, such as rectangular, semi-circular, or trapezoidal. In this embodiment, the cross-section of the wire rope guide groove 311 is a semi-circular arc structure. The semi-circular arc structure has a better centering effect and can achieve a good guiding effect on the wire rope 500.

[0042] Please see Figure 4 , Figure 7 and Figure 8 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the bottom diameter of the wire rope guide groove 311 is equal to the bottom diameter of the wire rope limiting groove 331. This arrangement allows the wire rope 500 extending from the wire rope limiting groove 331 to slide and abut more precisely with the wire rope guide grooves 311 on both sides, improving the guiding accuracy of the wire rope 500 at the U-shaped bend, thereby improving the stress condition of the wire rope 500 during use and ultimately extending its service life.

[0043] Please see Figure 1 , Figure 9 , Figure 10In the counterweight adjustment device for a small boring and milling machine of the present invention, the wire rope wheel bracket 130 includes a bracket base plate 131, a first bracket upright plate 133, and a second bracket upright plate 135. The first bracket upright plate 133 and the second bracket upright plate 135 are fixedly installed on the bracket base plate 131. The side of the first bracket upright plate 133 and the second bracket upright plate 135 closer to the three-point wheel mechanism 300 is higher than the side of the fixed wheel mechanism 400. The first bracket upright plate 133 and the second bracket upright plate 135 are provided with concentric shaft holes 134. The shaft of the wire rope wheel 110 is fixedly installed in the shaft holes 134. A bracket connecting plate 137 is fixedly installed between the first bracket upright plate 133 and the second bracket upright plate 135. A stiffening rib 136 is fixedly welded between the first support plate 133 and the second support plate 135. The stiffening rib 136 is located at the center of the distance between the two shaft holes 134, which reinforces the overall wire rope wheel support 130 and ensures the stability of the overall structure of the wire rope wheel support 130. A support top plate 138 is fixedly installed at the highest point of the first support plate 133 and the second support plate 135 to prevent the wire rope 500 from coming off during operation and to stabilize the support plate. A support reinforcing rib 132 is fixedly welded between the support bottom plate 131, the first support plate 133 and the second support plate 135, which assists in the stability of the support plate and improves the load-bearing capacity of the support plate.

[0044] Please see Figures 1 to 3 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the fixed wheel mechanism 400 includes a fixed wheel frame 420, a fixed wheel 410, and a second threaded post 430. The second threaded post 430 is fixedly connected to the bottom of the fixed wheel frame 420. A fixed wheel connecting hole 421 is provided on the fixed wheel frame 420. The fixed wheel connecting hole 421 is connected to the fixed wheel 410 through a third pin. A second locking nut 440 is threadedly connected to the second threaded post 430. The second threaded post 430 is fixedly connected to the counterweight block in the counterweight box 1000 and then locked by the second locking nut 440. The wire rope 500 passes around the fixed wheel 410 and is fixed by a wire rope lock 600. The wire rope 500 passes around the fixed wheel 410 to form a U-shaped bend. The wire rope 500 at both ends of the U-shaped bend is fixed by the wire rope lock 600.

[0045] Please see Figure 4 , Figure 7 , Figure 8In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the pulley 310 is provided with a pulley center hole 312 and a wire rope guide groove 311, and the gear train 330 is provided with a gear train center hole 332 and a wire rope limiting groove 331. The pulley center hole 312 is smaller than the gear train center hole 332, and the load-bearing capacity of the gear train 330 is higher than that of the pulley 310. Therefore, a larger diameter pin is required for load bearing. The bottom diameter of the wire rope guide groove 311 is smaller than that of the wire rope limiting groove 331. The bottom diameters of the grooves are equal. In this embodiment, through force analysis and calculation, the bottom diameter of the wire rope guide groove 311 and the bottom diameter of the wire rope limiting groove 331 are both φ18mm. The positioning center diameter of the wire rope guide groove 311 is φ53mm, and the positioning center diameter of the wire rope 500 limiting groove 331 is φ80mm. By moving the positioning center of the wire rope 500 guide groove 311 outward, that is, expanding the diameter of the positioning center, the spacing of the wire ropes 500 is reduced.

[0046] Please see Figure 12 In one example of the counterweight adjustment device for a small boring and milling machine of the present invention, the two steel wire ropes 500 extending from both sides of the change wheel 330 form an angle of 40-60 degrees after being squeezed by the reducing wheels 310 on both sides (as shown by α in the figure); after a single steel wire rope 500 passes through the U-shaped bend of the change wheel 330, it extends from both sides of the change wheel 330, and after the spacing between the two steel wire ropes 500 is adjusted by the reducing wheels 310 on both sides, an angle is formed between the two steel wire ropes 500. The size of this angle directly affects the safety factor of the steel wire rope 500. When the angle is selected reasonably, a higher safety factor can be obtained, thereby making the operation of the steel wire rope 500 safer. In this embodiment, after experimental calculation, an angle of 50 degrees is selected. At this time, the steel wire rope 500 can obtain a good bending condition during the U-shaped bend, and the change wheel 330 and the reducing wheel 310 are in the vertical direction (e.g., Figure 12 The shorter distance along the X-axis saves installation space between the reduction wheel 310 and the connecting wheel 330.

[0047] Please see Figure 5 and Figure 4In the counterweight adjustment device for a small boring and milling machine of the present invention, the fixed frame 210 includes a front upright plate 211, a rear upright plate 212, and a base plate 216. The front upright plate 211, the rear upright plate 212, and the base plate 216 are fixedly installed. Both the front upright plate 211 and the rear upright plate 212 are provided with concentric reduction wheel holes 213 and gear holes 214. A first threaded hole 215 is provided below the reduction wheel holes 213 and gear holes 214 of the front upright plate 211 for axial positioning of the first pin 320. The base plate 216 is fixedly connected to the conical base 220. The reducing wheel 310 and the hanging wheel 330 are both connected between the front upright plate 211 and the rear upright plate 212. In this embodiment, preferably, the distance between the two reducing wheel holes 213 is 85-91mm. By setting different distances between the two reducing wheel holes 213, the distance between the double wire ropes 500 is adjusted, which indirectly reduces the width of the wire rope wheel bracket 130, thereby achieving the adjustment of the counterweight structure of the small boring and milling machine.

[0048] Please see Figure 3 , Figure 6 In the counterweight adjustment device for a small boring and milling machine of the present invention, the fixed wheel frame 420 includes a fixed wheel frame base plate 425, a fixed wheel frame upright plate 423, and a fixed wheel frame intermediate plate 424. The fixed wheel frame base plate 425, the fixed wheel frame upright plate 423, and the fixed wheel frame intermediate plate 424 are fixedly welded together. The fixed wheel frame upright plate 423 and the fixed wheel frame intermediate plate 424 are provided with concentric fixed wheel connecting holes 421. A second threaded post 430 is fixedly connected to the bottom of the fixed wheel frame base plate 425. Two fixed wheels 410 are arranged between the fixed wheel frame intermediate plate 424 and the fixed wheel frame upright plate 423 on both sides.

[0049] Please see Figure 4 , Figure 11 There is a certain gap space 1200 between the existing drive mechanism 800 and the chain counterweight bracket 1100. In order to ensure that the overall accuracy of this type of boring and milling machine remains unchanged, it is necessary to ensure that the position of the counterweight block in the counterweight box 1000 and the lifting point of the boring box 900 remains unchanged. Considering the short horizontal straight distance between the two lifting points and the limitations of the diameter and wheel diameter of the wire rope 500, a small-diameter double-strand wire rope 500 is adopted for load bearing. However, this method increases the width of the wire rope wheel bracket 130, causing the wire rope wheel bracket 130 to interfere with the drive mechanism 800 during installation. In the design process, if a small-diameter fixed wheel is used to bend the wire rope 500 for use, it will cause the inner wire rope 500 harness to be compressed and the outer wire rope 500 harness to be stretched due to the excessively small bending angle. After installation, there will be a certain degree of bending damage, which greatly reduces the service life and safety of the wire rope 500.

[0050] This invention relates to a small boring and milling machine counterweight adjustment device. Through the cooperation of a wire rope 500, a wire rope mechanism 100, a fixed wheel fixing frame 200, a three-point wheel mechanism 300, and a fixed wheel mechanism 400, and by ensuring that the connection points between the fixed wheel fixing frame 200 and the boring box 900, and between the fixed wheel mechanism 400 and the counterweight block in the counterweight box 1000, are consistent with the original chain and the connection points between the counterweight bracket and the boring box 900 and the counterweight block, the device achieves a transmission method that replaces the original chain with a wire rope 500 while maintaining the unchanged suspension point position. Simultaneously, the three-point wheel mechanism... The U-shaped bend design of the wheel mechanism 300 ensures that the width of the wire rope 500 support is essentially the same as that of the original chain counterweight support 1100, avoiding interference with the drive mechanism 800 during installation. Therefore, this invention allows for convenient inspection and maintenance by replacing the original chain drive with the wire rope 500 without changing the lifting point position, reducing the probability of equipment falls and improving safety. Furthermore, the unchanged lifting point position avoids significant equipment modifications and reduces modification costs. Thus, this invention effectively overcomes some practical problems in the prior art, possessing high utilization value and practical significance. The above embodiments are merely illustrative of the principles and effects of this invention and are not intended to limit it. Anyone skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention should still be covered by the claims of this invention.

Claims

1. A counterweight adjustment device for a small boring and milling machine, comprising a column, a boring box, and a counterweight box, wherein the boring box is slidably mounted on one side of the column in a vertical direction, and the counterweight box is fixedly mounted on the other side of the column, and has a counterweight block that slides in a vertical direction, characterized in that, Also includes: A wire rope mechanism is fixedly installed on the top of the column and has a first slide rail and a second slide rail arranged in parallel. A fixed wheel fixing bracket is fixedly installed on the boring box; The three-point wheel mechanism is mounted on the fixed wheel fixing frame and is equipped with a hanging wheel; The fixed wheel mechanism is fixedly connected to the counterweight block inside the counterweight box; A steel wire rope, one end of which is fixed to the fixed wheel mechanism, and the other end of which passes through the first slide rail, around the hanging wheel, through the second slide rail, and is fixedly connected to the fixed wheel mechanism. The three-point wheel mechanism also includes at least one reducing wheel, which is disposed on the fixed wheel fixing frame and squeezes the wire rope on one or both sides of the hanging wheel to reduce the distance between the wire ropes on both sides of the hanging wheel.

2. The compact boring-milling machine counterweight adjusting device according to claim 1, characterized in that, There are two reducing wheels, which are symmetrically arranged on both sides of the coupling.

3. The compact boring-milling machine counterweight adjustment device according to claim 1, characterized in that, The pulley and / or the pitch reduction wheel are rotatably mounted on the fixed wheel fixing frame, and the edge of the pulley is provided with a wire rope limiting groove.

4. The counterweight adjustment device for a small boring and milling machine according to claim 3, characterized in that, The bending radius of the wire rope at the compression point of the pulley is smaller than the bending radius of the wire rope on the sheave.

5. The compact boring-milling machine counterweight adjustment device according to claim 4, characterized in that, The center distance between the two steel wire ropes threaded between the two pulleys is consistent with the distance between the first slide rail and the second slide rail.

6. The compact boring-milling machine counterweight adjustment device according to claim 5, characterized in that, The wire rope mechanism includes a wire rope wheel bracket and a wire rope wheel. The wire rope wheel is rotatably connected to the wire rope wheel bracket, and the first slide rail and the second slide rail are coaxially arranged on the wire rope wheel.

7. The compact boring-milling machine counterweight adjustment device according to claim 5, characterized in that, The rim of the pulley with reduced pitch is provided with a wire rope guide groove, and the wire rope slide is provided in the wire rope guide groove.

8. The counterweight adjustment device for a small boring and milling machine according to claim 7, characterized in that, The bottom diameter of the wire rope guide groove is equal to the bottom diameter of the wire rope limiting groove.

9. The counterweight adjustment device for a small boring and milling machine according to claim 8, characterized in that, The two steel wire ropes extending from both sides of the pulley form an angle of 30 to 60 degrees after being squeezed by the pulleys on both sides.

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