A symmetrical constant tension mechanism for electrode wire used in wire-cutting machine tools

Abstract

The present invention discloses a symmetrical constant tension mechanism for an electrode wire used in a wire cutting machine, comprising: a tensioning wire mechanism main body, a wire tensioner counterweight structure, and a wire break protector, wherein the tensioning wire mechanism main body, the wire tensioner counterweight structure, and the wire break protector are cooperatively arranged in the wire cutting machine main body; the tensioning wire mechanism main body comprises a left fixed cover plate, a first slider, a circular optical axis guide rail assembly, a second slider group, a flexible steel wire rope, a handle, a slide plate, a right fixed cover plate, and a guide rail fixed base plate. The present invention achieves constant force tensioning of the electrode wire during the reciprocating motion of the wire cutting machine and elastic buffering of the guide wheels on the upper and lower elastic devices of the mechanism of the present invention when the electrode wire is reversing, thereby accurately offsetting the inertial reaction force of the electrode wire during the reversing motion, preventing the electrode wire from being stretched or broken due to excessive tension and strong pulling, and has the advantages of extending the service life of the electrode wire and improving cutting accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of wire cutting machines, in particular to a symmetrical constant tension mechanism for an electrode wire used in a wire cutting machine. Background Art

[0002] The wire cutting machine was developed by the Soviet couple Lazarenko and his wife when they were studying the phenomenon and causes of damage to switch contacts caused by spark discharge corrosion. They discovered that the instantaneous high temperature of the electric spark can cause local metal to melt, oxidize and corrode, thus creating and inventing the electric spark machining method.

[0003] The electrode wire mainly used in existing wire cutting machines is molybdenum wire. Since the electrode wire runs back and forth at high speed during operation, there is a so-called "tight edge" and "loose edge" phenomenon, that is, the wire is tight when it is reeling in and loose when it is unreeling. Wire cutting is a high-precision process. If the "tight edge" and "loose edge" phenomena exist, the surface roughness of the processed parts will increase, and stripes will appear, which will greatly affect the processing accuracy. Therefore, various devices or structures that can adjust the tightness of the electrode wire to maintain constant tension of the electrode wire have emerged.

[0004] Therefore, we propose a symmetrical constant tension mechanism for electrode wire used in wire cutting machine tools in order to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a symmetrical constant tension mechanism for an electrode wire for a wire cutting machine tool, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a symmetrical constant tension mechanism for an electrode wire for a wire-cutting machine tool, comprising: a tensioning wire mechanism main body, a wire tensioner counterweight structure, and a wire break protector, wherein the tensioning wire mechanism main body, the wire tensioner counterweight structure, and the wire break protector are cooperatively arranged in a wire-cutting machine main body, and the wire-cutting machine main body comprises a steering guide wire wheel, an electrode wire, a wire storage drum, a guide wire wheel, and a fixture; the electrode wire is led out from the wire storage drum, passes through the guide wire wheel above the tensioning wire mechanism main body, enters the upper steering guide wire wheel, passes through the fixture, passes through the lower steering guide wire wheel and the lower guide wire wheel, and then passes through the bottom of the tensioning wire mechanism main body and returns to the wire storage drum;

[0007] The tensioning wire mechanism body comprises a left fixed cover plate, a first slider, a circular optical axis guide rail assembly, a second slider group, a flexible steel wire rope, a handle, a slide plate, a right fixed cover plate and a guide rail fixed bottom plate;

[0008] Two circular optical axis guide rail assemblies are fixedly installed between the left fixed sealing plate and the right fixed sealing plate, and the first slider, the second slider group and the slide plate are slidably connected to the circular optical axis guide rail assemblies;

[0009] The circular optical axis guide rail assembly includes a circular optical axis guide rail and an optical axis bearing. The circular optical axis guide rail is sleeved with a first spring and a second spring. The circular optical axis guide rail is sleeved with an optical axis bearing. The optical axis bearing is fixedly installed with the first slider, the second slider group and the slide plate. The first spring and the second spring are respectively located on the left and right sides of the first slider.

[0010] The left end of the first spring abuts against the left fixed cover plate, and the right end abuts against the first slider. The left end of the second spring abuts against the first slider, and the right end abuts against the second slider group.

[0011] A first guide pulley is rotatably installed in the middle of the first slider, and a fixing clamp is fixedly installed in the middle of the first slider, and the fixing clamp clamps one end of the flexible steel wire rope;

[0012] The second slider group is mainly composed of a slider body connected to a guide wheel sleeve in an integral manner from top to bottom;

[0013] A cavity is provided in the right fixed cover plate and passes through the left and right surfaces. The second guide pulley and the third guide pulley are rotatably installed in the cavity. The flexible steel wire rope clamped by the fixed clamp passes through the second guide pulley, the first guide pulley and the third guide pulley in sequence and then enters the tensioner counterweight structure. The flexible steel wire rope movably passes through the second slider group. The flexible steel wire rope, the fixed clamp, the first guide pulley, the second guide pulley, the third guide pulley and the first slider constitute a movable pulley group structure. The slide plate is provided with a wire hole for the flexible steel wire rope to pass through.

[0014] Preferably, the bottom of the slider body is slidably connected to the guide slider, and another group of guide sliders is also provided at the bottom of the first slider. The guide sliders are fixedly mounted on the guide rail fixed base plate, and the left and right ends of the guide rail fixed base plate are respectively fixedly mounted with the left fixed sealing plate and the right fixed sealing plate. Two guide grooves are provided in the guide rail fixed base plate. The guide grooves and the guide sliders are embedded and fixedly mounted, and bolt holes are provided at the bottom of the guide rail fixed base plate. Bolts are passed through the bolt holes to fix the guide rail fixed base plate to the wire cutting machine body.

[0015] Preferably, a handle is fixedly mounted on the skateboard, and the handle is mainly composed of fixing screw holes on both sides of the handle. The handle is connected to the skateboard through a card, and bolts pass through the fixing screw holes to fix the handle on the skateboard.

[0016] Preferably, the wire tensioner counterweight structure includes an upper fixed seat, a counterweight block, a lower fixed seat and a sliding rod. There are two sliding rods, and the upper and lower ends of the sliding rod are fixedly installed with the upper fixed seat and the lower fixed seat respectively. The upper fixed seat and the lower fixed seat are fixedly installed with the wire cutting machine body. The sliding rod is slidably connected to the counterweight block through the optical axis bearing. The guide pulley group is rotatably installed in the upper fixed seat, and the flexible steel wire rope is fixedly connected to the counterweight block after passing through the guide pulley group.

[0017] Preferably, the left fixed cover plate is provided with a second switch hole, a first switch hole, a second limit hole and a first limit hole, and two card slots are provided inside the left fixed cover plate, the second switch hole and the second limit hole are connected to one card slot, the first switch hole and the first limit hole are connected to the other card slot, and the second limit hole and the first limit hole pass through the left and right surfaces of the left fixed cover plate;

[0018] The first control rod and the second control rod are respectively passed through the second limiting hole and the first limiting hole, and the first control rod and the second control rod are provided with a first limiting groove on the left part, and a second limiting groove is provided on the right part of the first control rod and the second control rod. The first slider is provided with a limiting hole, and a pin is passed through the limiting hole and inserted into the second limiting groove to achieve relative fixation of the first control rod and the first slider, and the right end of the second control rod is fixedly connected to the skateboard. The skateboard is provided with a hole groove and a control rod hole, and the hole groove and the control rod hole are communicated. After the right end of the second control rod is inserted into the control rod hole, the pin is inserted into the hole groove, and the pin is inserted into the second limiting groove at the right end of the second control rod to lock the right end of the second control rod.

[0019] Preferably, a switch assembly is installed in each of the first switch hole and the second switch hole, and the switch assembly includes a pin, a return spring, a control knob and a card shaft. The pin is inserted into the first switch hole and the second switch hole, the control knob is fixedly installed on the upper end of the pin, and the card shaft is integrally connected to the lower end of the pin. A return spring is sleeved on the pin, the upper end of the return spring abuts against the control knob, and the lower end of the return spring abuts against the surface of the left fixed cover plate, the card shaft is plugged into the first limit groove, and the card shaft is connected to the card slot for up and down sliding.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. When the wire needs to be tightened, release the first control lever and the second control lever. The first spring and the second spring eject the second slider group and the first slider to the right, causing the guide wheel sleeve to move the electrode wire to the right, thereby tightening the electrode wire.

[0022] 2. The counterweight pulls the flexible steel wire rope by its own gravity. Since the flexible steel wire rope, the fixing clamp, the first guide pulley, the second guide pulley, the third guide pulley and the first slider constitute a movable pulley group structure, the counterweight exerts a three-fold constant force on the second slider group.

[0023] 3. When the electrode wire breaks, the counterweight block drives the second slider assembly to the far right through the flexible steel wire rope under the force of free fall, and the upper guide wheel sleeve hits the broken wire protector, which controls the wire cutting machine to stop working, which is safer;

[0024] 4. Realize constant force tensioning of the electrode wire during the reciprocating motion of the wire cutting machine and the guide wheels on the upper and lower elastic devices on the mechanism of the present invention play an elastic buffering role when the electrode wire is reversing, thereby accurately offsetting the inertial reaction force during the reversing motion of the electrode wire, avoiding excessive tension, extension or breakage of the electrode wire, and having the advantages of extending the service life of the electrode wire and improving cutting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a structural diagram of the present invention and the wire cutting machine body;

[0027] Figure 3 It is a structural schematic diagram of the tensioning wire mechanism main body and the tensioner counterweight structure in the present invention;

[0028] Figure 4 This is a cross-sectional view of the main structure of the tensioning wire mechanism of the present invention;

[0029] Figure 5 Schematic diagram of the structure of the slide plate, the guide rail fixed base plate, the first control rod and the second control rod in the present invention;

[0030] Figure 6 It is a cross-sectional view of the switch assembly and the tensioning wire mechanism body of the present invention;

[0031] Figure 7 This is a schematic diagram of the coordination of the first slider, the second slider group, the flexible steel wire rope and the counterweight block in the present invention.

[0032] In the figure: 1. Wire cutting machine body; 11. Steering wire guide wheel; 12. Electrode wire; 13. Wire storage drum; 14. Wire guide wheel; 15. Clamp tooling; 2. Tensioning wire mechanism body; 21. Left fixed cover plate; 211. Second switch hole; 212. First switch hole; 213. Second limit socket; 214. First limit socket; 215. First control rod; 2151. First limit slot; 2152. Second limit slot; 216. Second control rod; 217. Slot; 22. First slider; 221. First guide pulley; 222. Fixed clamp; 223. Limit hole; 23. Circular optical axis guide rail assembly; 231. Circular optical axis guide rail; 232. First spring; 233. Second spring; 24. Second slider Group; 241, slider body; 242, guide wheel sleeve; 243, guide slider; 25, flexible steel wire rope; 26, handle; 261, handle; 2611, fixing screw hole; 27, slide plate; 271, wire hole; 272, hole groove; 273, control rod socket; 28, right fixed cover plate; 281, second guide pulley; 282, third guide pulley; 29, guide rail fixed base; 291, guide groove; 292, bolt hole; 3, wire tensioner counterweight structure; 31, upper fixed seat; 311, guide pulley group; 32, counterweight block; 33, lower fixed seat; 34, slide rod; 4, broken wire protector; 5, switch assembly; 51, pin; 52, reset spring; 53, control knob; 54, clamping shaft. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1-7 The present invention provides a technical solution: a symmetrical constant tension mechanism for an electrode wire for a wire cutting machine tool, comprising: a tensioning wire mechanism main body 2, a wire tensioner counterweight structure 3 and a wire break protector 4, wherein the tensioning wire mechanism main body 2, the wire tensioner counterweight structure 3 and the wire break protector 4 are cooperatively arranged in a wire cutting machine main body 1, and the wire cutting machine main body 1 comprises a steering wire guide wheel 11, an electrode wire 12, a wire storage drum 13, a wire guide wheel 14 and a fixture 15, wherein the electrode wire 12 is led out from the wire storage drum 13, passes through the wire guide wheel 14 above the tensioning wire mechanism main body 2, enters the upper steering wire guide wheel 11, passes through the fixture 15, passes through the lower steering wire guide wheel 11 and the lower wire guide wheel 14, passes through the lower side of the tensioning wire mechanism main body 2, and returns to the wire storage drum 13, forming a walking closed loop of the electrode wire 12;

[0035] The tensioning wire mechanism body 2 presses the electrode wire 12 to the right, so that the electrode wire 12 is always in a taut state, thereby achieving tensioning of the electrode wire 12;

[0036] The tensioning wire mechanism body 2 comprises a left fixed cover plate 21, a first slider 22, a circular optical axis guide rail assembly 23, a second slider assembly 24, a flexible steel wire rope 25, a handle 26, a slide plate 27, a right fixed cover plate 28 and a guide rail fixed bottom plate 29;

[0037] Two circular optical axis guide rail assemblies 23 are fixedly installed between the left fixed sealing plate 21 and the right fixed sealing plate 28, and the circular optical axis guide rail assembly 23 is slidably connected to the first slider 22, the second slider assembly 24 and the slide plate 27;

[0038] The circular optical axis guide rail assembly 23 includes a circular optical axis guide rail 231 and an optical axis bearing. The circular optical axis guide rail 231 is sleeved with a first spring 232 and a second spring 233. The circular optical axis guide rail 231 is sleeved with an optical axis bearing. The optical axis bearing is fixedly installed with the first slider 22, the second slider assembly 24 and the slide plate 27. The first spring 232 and the second spring 233 are respectively located on the left and right sides of the first slider 22.

[0039] The left end of the first spring 232 abuts against the left fixed sealing plate 21 , and the right end abuts against the first slider 22 . The left end of the second spring 233 abuts against the first slider 22 and the right end abuts against the second slider group 24 .

[0040] A first guide pulley 221 is rotatably installed in the middle of the first slider 22, and a fixing clamp 222 is fixedly installed in the middle of the first slider 22, and the fixing clamp 222 clamps one end of the flexible steel wire rope 25;

[0041] The second slider group 24 mainly consists of a slider body 241 integrally connected to a guide wheel sleeve 242 at the top and bottom. The bottom of the slider body 241 is slidably connected to a guide slider 243. Another group of guide sliders 243 is also provided at the bottom of the first slider 22. The guide sliders 243 are fixedly mounted on the guide rail fixed base plate 29. The left and right ends of the guide rail fixed base plate 29 are respectively fixedly mounted to the left fixed cover plate 21 and the right fixed cover plate 28. Two guide grooves 291 are defined in the guide rail fixed base plate 29. The guide grooves 291 are embedded and fixedly mounted with the guide sliders 243. Bolt holes 292 are defined at the bottom of the guide rail fixed base plate 29. Bolts are passed through the bolt holes 292 to fix the guide rail fixed base plate 29 to the wire cutting machine body 1.

[0042] The handle 26 is fixedly mounted on the slide 27. Pulling the handle 26 to the left drives the slide 27 to move to the left, and the slide 27 pushes the second slider group 24 to the left.

[0043] The handle 26 is mainly composed of fixing screw holes 2611 on both sides of the handle 261. The handle 261 is connected to the slide 27 by plugging. Bolts pass through the fixing screw holes 2611 to fix the handle 261 on the slide 27.

[0044] A cavity is provided in the right fixed cover plate 28, which passes through the left and right surfaces. A second guide pulley 281 and a third guide pulley 282 are rotatably installed in the cavity. The flexible steel wire rope 25 clamped by the fixed clamp 222 passes through the second guide pulley 281, the first guide pulley 221 and the third guide pulley 282 in sequence and then enters the tensioner counterweight structure 3. The flexible steel wire rope 25 movably passes through the second slider group 24. The flexible steel wire rope 25, the fixed clamp 222, the first guide pulley 221, the second guide pulley 281, the third guide pulley 282 and the first slider 22 constitute a movable pulley group structure to achieve a labor-saving effect. The slide plate 27 is provided with a wire hole 271 for the flexible steel wire rope 25 to pass through.

[0045] The wire tensioner counterweight structure 3 includes an upper fixed seat 31, a counterweight block 32, a lower fixed seat 33 and a slide rod 34. There are two slide rods 34. The upper and lower ends of the slide rod 34 are fixedly mounted with the upper fixed seat 31 and the lower fixed seat 33 respectively. The upper fixed seat 31 and the lower fixed seat 33 are fixedly mounted to the wire cutting machine body 1. The slide rod 34 is slidably connected to the counterweight block 32 through the optical axis bearing. A guide pulley group 311 is rotatably installed in the upper fixed seat 31. The flexible steel wire rope 25 is fixedly connected to the counterweight block 32 after passing through the guide pulley group 311.

[0046] The left fixed cover plate 21 is provided with a second switch hole 211, a first switch hole 212, a second limiting hole 213, and a first limiting hole 214. Two slots 217 are provided inside the left fixed cover plate 21. The second switch hole 211 and the second limiting hole 213 are connected to one slot 217, and the first switch hole 212 and the first limiting hole 214 are connected to the other slot 217. The second limiting hole 213 and the first limiting hole 214 pass through the left and right surfaces of the left fixed cover plate 21.

[0047] The first control rod 215 and the second control rod 216 are respectively passed through the second limiting hole 213 and the first limiting hole 214. The first control rod 215 and the second control rod 216 have a first limiting groove 2151 on the left, and a second limiting groove 2152 on the right. The first slider 22 has a limiting hole 223. A pin passes through the limiting hole 223 and is inserted into the second limiting groove 2152 to realize the first control rod 215 and the first slider. 22 is relatively fixed, the right end of the second control rod 216 is fixedly connected to the slide plate 27, and the slide plate 27 is provided with a hole groove 272 and a control rod insertion hole 273. The hole groove 272 and the control rod insertion hole 273 are communicated. After the right end of the second control rod 216 is inserted into the control rod insertion hole 273, a pin is inserted into the hole groove 272, and the pin is inserted into the second limiting groove 2152 at the right end of the second control rod 216 to lock the right end of the second control rod 216, thereby facilitating the assembly and disassembly of the second control rod 216 and the slide plate 27;

[0048] A switch assembly 5 is installed in each of the first switch hole 212 and the second switch hole 211. The switch assembly 5 includes a pin 51, a return spring 52, a control knob 53, and a clamping shaft 54. The pin 51 is inserted into the first switch hole 212 and the second switch hole 211. The control knob 53 is fixedly installed on the upper end of the pin 51. The clamping shaft 54 is integrally connected to the lower end of the pin 51. The return spring 52 is sleeved on the pin 51. The upper end of the return spring 52 abuts against the control knob 53, and the lower end of the return spring 52 abuts against the surface of the left fixed cover 21. The clamping shaft 54 is plugged into the first limit groove 2151, and the clamping shaft 54 is slidably connected to the clamping groove 217 up and down.

[0049] When the first slider 22 and the slide plate 27 move to the left, the left ends of the first control rod 215 and the second control rod 216 are respectively inserted into the first limit hole 214 and the second limit hole 213, and the clamping shaft 54 is plugged into the first limit groove 2151 to clamp the first control rod 215 and the second control rod 216, thereby fixing the first slider 22 and the slide plate 27. When the control knob 53 is pressed downward, the return spring 52 is compressed, and the clamping shaft 54 moves downward in the clamping groove 217 to disengage from the first limit groove 2151. After the first control rod 215 and the second control rod 216 are released, the return spring 52 can lift and reset the pin 51.

[0050] Working principle: By pulling the handle 26, the slide plate 27 is driven to move leftward along the circular optical axis guide rail 231 and the guide slide groove 291. The slide plate 27 pushes the second slider group 24 to the left, the second spring 233 is compressed, the guide wheel sleeve 242 moves to the left, the electrode wire 12 is not under pressure and is in the initial state, the second spring 233 pushes the first slider 22 to the left, the first spring 232 is in a compressed state, the left ends of the first control rod 215 and the second control rod 216 are locked by the switch assembly 5, the first slider 22 and the second slider group 24 are locked and fixed, at this time, the first slider 22 pulls the flexible steel wire rope 25 through the first guide pulley 221 and the fixing clamp 222, so that the travel of the flexible steel wire rope 25 is lengthened, and then the counterweight block 32 is pulled up through the guide pulley group 311;

[0051] When the wire needs to be tightened, the switch assembly 5 releases the first control rod 215 and the second control rod 216, and the first spring 232 and the second spring 233 eject the second slider group 24 and the first slider 22 to the right, so that the guide wheel sleeve 242 drives the electrode wire 12 to move to the right, thereby achieving a constant force tensioning effect on the electrode wire 12;

[0052] The counterweight 32 pulls the flexible steel wire rope 25 by its own weight. Since the flexible steel wire rope 25, the fixing clamp 222, the first guide pulley 221, the second guide pulley 281, the third guide pulley 282 and the first slider 22 form a movable pulley structure, the counterweight 32 generates a three-fold constant force on the second slider group 24.

[0053] When the electrode wire 12 breaks, the counterweight 32 drives the second slider assembly 24 to the far right through the flexible steel wire rope 25 under the force of free fall, and the upper guide wheel sleeve 242 touches the broken wire protector 4, and the broken wire protector 4 controls the wire cutting machine body 1 to stop working.

[0054] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A symmetrical constant tension mechanism for an electrode wire used in a wire-cutting machine tool, comprising: The wire tensioning mechanism body (2), the wire tensioning device counterweight structure (3) and the wire break protector (4) are characterized in that: the wire tensioning mechanism body (2), the wire tensioning device counterweight structure (3) and the wire break protector (4) are cooperatively arranged in the wire cutting machine body (1), and the wire cutting machine body (1) comprises a steering wire guide wheel (11), an electrode wire (12), a wire storage drum (13), a wire guide wheel (14) and a clamping tool (15); the electrode wire (12) is led out from the wire storage drum (13), passes through the wire guide wheel (14) above the wire tensioning mechanism body (2), enters the upper steering wire guide wheel (11), passes through the clamping tool (15), passes through the lower steering wire guide wheel (11) and the lower wire guide wheel (14), and then passes through the bottom of the wire tensioning mechanism body (2) and returns to the wire storage drum (13); The tensioning wire mechanism body (2) comprises a left fixed sealing plate (21), a first slider (22), a circular optical axis guide rail assembly (23), a second slider assembly (24), a flexible steel wire rope (25), a handle (26), a slide plate (27), a right fixed sealing plate (28) and a guide rail fixed bottom plate (29); Two circular optical axis guide rail assemblies (23) are fixedly installed between the left fixed sealing plate (21) and the right fixed sealing plate (28), and the circular optical axis guide rail assemblies (23) are slidably connected to the first slider (22), the second slider group (24) and the slide plate (27); The circular optical axis guide rail assembly (23) comprises a circular optical axis guide rail (231) and an optical axis bearing. A first spring (232) and a second spring (233) are sleeved on the circular optical axis guide rail (231). The circular optical axis guide rail (231) is sleeved with the optical axis bearing. The optical axis bearing is fixedly mounted on the first slider (22), the second slider assembly (24) and the slide plate (27). The first spring (232) and the second spring (233) are respectively located on the left and right sides of the first slider (22). The left end of the first spring (232) abuts against the left fixed sealing plate (21), and the right end abuts against the first slider (22); the left end of the second spring (233) abuts against the first slider (22), and the right end abuts against the second slider group (24); A first guide pulley (221) is rotatably mounted in the middle of the first slider (22), and a fixing clamp (222) is fixedly mounted in the middle of the first slider (22), and the fixing clamp (222) clamps one end of the flexible steel wire rope (25); The second slider group (24) includes a slider body (241), and the slider body (241) is integrally connected to the guide wheel sleeve (242) from top to bottom; A cavity is provided in the right fixed sealing plate (28) and passes through the left and right surfaces. A second guide pulley (281) and a third guide pulley (282) are rotatably installed in the cavity. The flexible steel wire rope (25) clamped by the fixed clamp (222) passes through the second guide pulley (281), the first guide pulley (221) and the third guide pulley (282) in sequence and then enters the tensioner counterweight structure (3). The flexible steel wire rope (25) movably passes through the second slider group (24). The flexible steel wire rope (25), the fixed clamp (222), the first guide pulley (221), the second guide pulley (281), the third guide pulley (282) and the first slider (22) constitute a movable pulley group structure. The slide plate (27) is provided with a wire hole (271) for the flexible steel wire rope (25) to pass through. The bottom of the slider body (241) is slidably connected to the guide slider (243), and another group of guide sliders (243) are also set at the bottom of the first slider (22). The guide sliders (243) are fixedly installed on the guide rail fixed base plate (29). The left and right ends of the guide rail fixed base plate (29) are fixedly installed with the left fixed sealing plate (21) and the right fixed sealing plate (28) respectively. Two guide slots (291) are opened in the guide rail fixed base plate (29). The guide slots (291) and the guide sliders (243) are embedded and fixedly installed. A bolt hole (292) is opened at the bottom of the guide rail fixed base plate (29). The guide rail fixed base plate (29) is fixedly installed with the wire cutting machine body (1) by passing the bolt through the bolt hole (292); The wire tightener counterweight structure (3) comprises an upper fixed seat (31), a counterweight (32), a lower fixed seat (33) and a slide bar (34). Two slide bars (34) are provided. The upper and lower ends of the slide bar (34) are fixedly mounted on the upper fixed seat (31) and the lower fixed seat (33) respectively. The upper fixed seat (31) and the lower fixed seat (33) are fixedly mounted on the wire cutting machine body (1). The slide bar (34) is slidably connected to the counterweight (32) through an optical axis bearing. A guide pulley group (311) is rotatably mounted in the upper fixed seat (31). The flexible steel wire rope (25) is fixedly connected to the counterweight (32) after passing through the guide pulley group (311).

2. The symmetrical constant tension mechanism for electrode wire used in a wire-cutting machine tool according to claim 1, characterized in that: The handle (26) is fixedly mounted on the slide (27), and the handle (26) includes a handle (261). Fixing screw holes (2611) are provided on both sides of the handle (261). The handle (261) is connected to the slide (27) by plugging, and bolts pass through the fixing screw holes (2611) to fix the handle (261) on the slide (27).

3. The symmetrical constant tension mechanism for electrode wire used in a wire-cutting machine tool according to claim 1, characterized in that: The left fixed sealing plate (21) is provided with a second switch hole (211), a first switch hole (212), a second limit hole (213) and a first limit hole (214); two card slots (217) are provided inside the left fixed sealing plate (21); the second switch hole (211) and the second limit hole (213) are connected to one card slot (217); the first switch hole (212) and the first limit hole (214) are connected to the other card slot (217); the second limit hole (213) and the first limit hole (214) pass through the left and right surfaces of the left fixed sealing plate (21); The first control rod (215) and the second control rod (216) are respectively passed through the second limiting socket (213) and the first limiting socket (214). The first control rod (215) and the second control rod (216) are provided with a first limiting groove (2151) on the left, and a second limiting groove (2152) is provided on the right of the first control rod (215) and the second control rod (216). The first slider (22) is provided with a limiting hole (223). A pin is inserted through the limiting hole (223) and then inserted into the second limiting groove (2152) to realize the first control. The control rod (215) is relatively fixed to the first slider (22), and the right end of the second control rod (216) is fixedly connected to the slide plate (27). The slide plate (27) is provided with a hole groove (272) and a control rod insertion hole (273). The hole groove (272) and the control rod insertion hole (273) are communicated. After the right end of the second control rod (216) is inserted into the control rod insertion hole (273), a pin rod is inserted into the hole groove (272), and the pin rod is inserted into the second limiting groove (2152) at the right end of the second control rod (216), thereby locking the right end of the second control rod (216).

4. The symmetrical constant tension mechanism for electrode wire used in a wire-cutting machine tool according to claim 3, characterized in that: A switch assembly (5) is installed in each of the first switch hole (212) and the second switch hole (211), and the switch assembly (5) comprises a pin (51), a return spring (52), a control knob (53) and a clamping shaft (54). The pin (51) is inserted into the first switch hole (212) and the second switch hole (211). The control knob (53) is fixedly installed on the upper end of the pin (51), and the clamping shaft (54) is integrally connected to the lower end of the pin (51). The pin (51) is sleeved with a return spring (52), the upper end of the return spring (52) abuts against the control knob (53), and the lower end of the return spring (52) abuts against the surface of the left fixed sealing plate (21). The clamping shaft (54) is plugged into the first limiting groove (2151), and the clamping shaft (54) is slidably connected to the clamping groove (217) up and down.

Images