Stable and adjustable gravity type automatic wire tightening device suitable for linear cutting machine tool

Abstract

The utility model discloses a stable and adjustable gravity type automatic wire tightening device suitable for a linear cutting machine tool, which comprises a first wire tightening mechanism, a second wire tightening mechanism, a third wire tightening mechanism, a fourth wire tightening mechanism, a fifth wire tightening mechanism, a sixth wire tightening mechanism, a fifth wire tightening mechanism and a sixth wire tightening mechanism, the gravity wire tightening mechanism is detachably connected with the first wire tightening mechanism and is used for adjusting the tensioning force of the molybdenum wire; the lower end of the gravity wire tightening mechanism is detachably connected with a heavy hammer locking and releasing mechanism, the tensioning force of the molybdenum wire is adjusted by increasing or reducing balancing weights according to the principle that the gravity is constant, so that the molybdenum wire of the wire cut electrical discharge machining tool can obtain the constant, uniform, continuous, stable and adjustable tensioning force in the running process, and the service life of the wire cut electrical discharge machining tool is prolonged. Therefore, the machining precision is further improved, the problem of single-side wire loosening of the wire cylinder is solved, the machining precision of a linear cutting machine tool can be further improved, the machining precision of workpieces such as hole pattern sample plates is guaranteed, and thick workpieces can be easily machined.

Description

Technical Field

[0001] The utility model belongs to the technical field of wire-cutting machine tool wire tightening, and in particular relates to a stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools. Background Art

[0002] Currently, the stability of the molybdenum wire is one of the most important factors in ensuring cutting accuracy during wire EDM machining. Before machining, the wire tension must be manually checked and adjusted to ensure the wire maintains the highest possible stability during operation, ensuring the machining accuracy of workpieces such as hole templates.

[0003] However, several technical deficiencies exist during the processing process: Manual tightening is subject to human factors, and the average person cannot precisely control the tightening force, resulting in a failure to maintain a constant, appropriate, and uniform tension on the molybdenum wire. This in turn hinders the stability of the molybdenum wire during operation, severely impacting the machining accuracy of the hole pattern. Due to the inaccurate control of the molybdenum wire tension during manual tightening, loose wire cannot guarantee wire stability, and overtightening can easily lead to wire breakage, resulting in poor machining accuracy and significant loss of both material and molybdenum wire.

[0004] During wire EDM machining, the molybdenum wire discharges into the workpiece when it comes within 0.02mm of the workpiece, creating an electro-erosion effect through the spark, which cuts the workpiece. When machining thick parts, the instability of the molybdenum wire can easily cause it to directly contact the workpiece, creating a short circuit. This can cause the wire EDM to activate a short-circuit alarm and shut down, rendering machining impossible.

[0005] The wire drum is loose on one side. After the EDM wire cutting machine has been used for a period of time: due to wear of the wire drum, the cylindricity of the wire drum is reduced; the position of the wire drum on the wire drum seat is displaced, causing the molybdenum wire wrapped on the wire drum to gradually become loose from one side of the wire drum to the other side during wire transportation. No matter how the wire is tightened manually, the wire will still be loose on one side as long as the wire drum runs back and forth a few times.

[0006] Spring automatic wire tensioners are widely used nowadays. The tensioning force of the wire tensioner is provided by the spring. The tensioning force provided by the spring decreases as the spring elongates and increases as the spring is compressed. The force is not constant and cannot be adjusted. It cannot provide constant, uniform, stable and adjustable tensioning force for the molybdenum wire, and cannot guarantee the stability of the molybdenum wire. The processing accuracy cannot be guaranteed and cannot meet our requirements for making workpieces, such as roller hole templates.

[0007] That is to say, in the current EDM wire cutting process, manual wire tightening cannot accurately control the tension of the molybdenum wire, and the molybdenum wire cannot obtain a suitable, uniform and constant tension, which seriously affects the processing accuracy and cannot meet the needs of roller hole template processing. In addition, the wire is prone to breakage when the tension is too high. When processing thick parts, the molybdenum wire is unstable and easily contacts the workpiece directly, causing a short circuit and causing the machine tool to alarm and shut down. The wire drum is unilaterally loose, and manual wire tightening cannot solve the problem of unilateral loose wire. The currently used spring automatic wire tightener uses a spring to provide the tightening force, which cannot provide a constant, uniform, stable and adjustable tension for the molybdenum wire. It also cannot meet the requirements of making workpieces such as roller hole templates.

[0008] Because the spring-tightened automatic wire tightener uses a spring as the tensioning force of the molybdenum wire. The tensioning force provided by the spring decreases as the spring elongates and increases as the spring is compressed. The tensioning force is not constant and cannot be adjusted. It cannot provide constant, uniform, stable and adjustable tensioning force for the molybdenum wire.

[0009] Therefore, in view of the above-mentioned technical problems and defects, it is urgent to design and develop a gravity-type automatic wire tightening device that is suitable for wire cutting machine tools and is stable and adjustable. Utility Model Content

[0010] In order to overcome the above-mentioned deficiencies and difficulties in the prior art, the purpose of the present invention is to provide a stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools.

[0011] The purpose of the present utility model is achieved as follows: the device includes a first wire tightening mechanism for realizing the direction of the guide wire; and a gravity wire tightening mechanism detachably connected to the first wire tightening mechanism and used to adjust the tension of the molybdenum wire; the lower end of the gravity wire tightening mechanism is detachably connected to a weight locking and releasing mechanism, wherein the weight locking and releasing mechanism is used to lock or release the weight to provide tension for the molybdenum wire.

[0012] The present invention adopts a gravity-type automatic wire tightening device which is stable and adjustable and is suitable for wire cutting machines, the device comprising a first wire tightening mechanism for realizing the direction of the guide wire; and a gravity wire tightening mechanism which is detachably connected to the first wire tightening mechanism and is used to adjust the tension of the molybdenum wire; the lower end of the gravity wire tightening mechanism is detachably connected to a weight locking and releasing mechanism, wherein the weight locking and releasing mechanism is used to lock or release the weight to provide tension for the molybdenum wire; utilizing the principle of constant gravity, the tension of the molybdenum wire is adjusted by increasing or decreasing the counterweight block, so that the molybdenum wire of the electric spark wire cutting machine can obtain a constant, uniform, continuous, stable and adjustable tension during operation, thereby further improving processing accuracy, solving the problem of unilateral loose wire of the wire drum, and enabling it to further improve the processing accuracy of the wire cutting machine to ensure the processing accuracy of workpieces such as hole-type templates, and can easily process thicker workpieces.

[0013] In other words, this new solution uses gravity as the tensioning force for the molybdenum wire. This provides a constant, uniform, continuous, stable, and adjustable tension, resolving the issues of uneven manual tightening and unilateral loosening of the wire drum, which are unattainable with spring-type tensioners. Furthermore, the compact design prevents the weight from colliding with the wire drum in confined spaces, making it suitable for installation on all wire-cutting machines. It also requires no drilling and can be installed directly onto the mounting holes of the existing rear guide pulley. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools;

[0015] Figure 2 This is a schematic diagram of the structure of a stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to the present invention;

[0016] Figure 3 This is a second exploded schematic diagram of the structure of a stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of the wire tightener body of a stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools;

[0018] Figure 5 The utility model is a structural diagram of a gravity wire tightening mechanism of a stable and adjustable gravity type automatic wire tightening device suitable for wire cutting machine tools;

[0019] Figure 6 The utility model is a structural diagram of a heavy hammer locking and releasing mechanism of a stable and adjustable gravity-type automatic wire tightening device suitable for wire cutting machine tools;

[0020] Figure 7 The utility model is a structural diagram of the use process of a stable and adjustable gravity-type automatic wire tightening device suitable for wire cutting machine tools;

[0021] Figure 8 This is a structural diagram of the installation process of a stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools;

[0022] In the figure: 1-Figure-Eight ring; 2-Buffer spring; 3-Tightening wheel seat; 4-Combined heavy hammer; 5-Stainless steel optical shaft; 6-Guide wheel seat; 7-Pin; 8-Pressure plate; 9-Fastening screw; 10-Guide wheels a, b; 11-Dual-purpose Figure-Eight ring; 12-Tightening wheel; 13-Stainless steel retaining ring; 14-Linear bearing; 15-Pin screw; 16-Linear bearing mounting hole; 17-Guide wheel mounting hole; 18-Casing; 19-Spring slide shaft; 20-Casing fixing screw; 21-Hook card; 22-Adjusting plug; 23-Figure-Eight ring fixing screw; 24-Dual-purpose Figure-Eight ring; 25-Optical shaft locking screw; 26-Hook; 27-Tightening wheel mounting hole; 28-Retaining ring groove; 29-Wire drum; 30-Molybdenum wire; 31-Wire transport arm; 32-Original guide wheel mounting hole. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or substitutions made based on the teachings of the present invention fall within the scope of protection of the present invention.

[0024] As attached Figures 1-8 As shown, the utility model provides a stable and adjustable gravity-type automatic wire tightening device suitable for wire cutting machine tools, the device comprising a first wire tightening mechanism for realizing the direction of the guide wire; and a gravity wire tightening mechanism detachably connected to the first wire tightening mechanism and for adjusting the tension of the molybdenum wire;

[0025] The lower end of the gravity wire tightening mechanism is detachably connected to a weight locking and releasing mechanism, wherein the weight locking and releasing mechanism is used to lock or release the weight to provide tensioning force for the molybdenum wire.

[0026] A wire guide wheel seat is provided in the first wire tightening mechanism; at least two wire guide wheel mounting holes are provided at one end of the wire guide wheel seat; a first wire guide wheel and a second wire guide wheel are respectively provided in the wire guide wheel mounting holes;

[0027] At least two linear bearing mounting holes are provided at the upper end of the guide wheel seat and between the guide wheel mounting holes; a first linear bearing and a second linear bearing are respectively provided in the linear bearing mounting holes.

[0028] One end of the guide wheel seat is connected to at least one pin via a pin screw; one side of the pin is fixedly connected to a clamping plate via a fastening screw.

[0029] A stainless steel clamping ring is provided at one end of the first linear bearing or the second linear bearing; a buffer spring is provided at one end of the first linear bearing or the second linear bearing and located on the guide wheel seat.

[0030] The upper end of the gravity tensioning mechanism is provided with a combined weight for applying gravity tension to the molybdenum wire and adjusting the tension of the molybdenum wire by adding or removing the counterweight;

[0031] The combined weight is detachably connected via at least two 8-shaped rings in combination with fastening screws and at least two stainless steel optical shafts.

[0032] A weight locking and releasing mechanism is provided at the lower end of the gravity tightening mechanism; a tightening wheel seat is provided in the weight locking and releasing mechanism; the tightening wheel seat is detachably connected through at least one 8-shaped ring, combined with a fastening screw and at least two stainless steel optical shafts.

[0033] At least one tension wheel mounting hole is provided in the middle of the tension wheel seat; a tension wheel is provided in the tension wheel mounting hole; at least two protrusions are provided at the upper end of the tension wheel mounting hole and on one side of the tension wheel seat; at least one hook is provided between the protrusions.

[0034] The wire guide wheel seat is fixedly connected to a casing via a fastening screw; a spring sliding shaft is arranged inside the casing.

[0035] The lower side of the spring slide shaft is fixedly connected with a hook card via a fastening screw.

[0036] One end of the spring slide shaft is provided with an adjustment plug for adjusting the position of the spring slide shaft in the casing.

[0037] Specifically, in a specific embodiment of the present invention, a gravity-type automatic wire tensioner for a wire-cutting machine tool is provided, comprising a wire tensioner body (i.e., a first tensioning mechanism), a gravity tensioning mechanism, and a weight locking and releasing mechanism. The wire tensioner body is used to mount a wire guide wheel and a linear bearing, connect the gravity tensioning mechanism and the weight releasing mechanism, and is assembled and integrated with the wire-cutting machine tool. It comprises a wire guide wheel seat, a linear bearing, a stainless steel retaining ring, a buffer spring, a pin, a pin screw, a pressure plate, and a fastening screw.

[0038] The gravity tightening mechanism, such as Figure 1 As shown in the figure, gravity is used to apply a constant, uniform, stable and adjustable tension to the molybdenum wire. Figure 2-Figure 3 - Figure 5 As shown, it consists of a stainless steel optical shaft, a figure-eight ring, a dual-purpose figure-eight ring, a figure-eight ring fixing screw, a combined weight, a tightening wheel seat, and a tightening wheel.

[0039] The weight locking and releasing mechanism is as follows: Figure 7 As shown, the weight locking and releasing mechanism is used to lock and release the weight. When locked, it is convenient for replacing and adjusting the molybdenum wire, and when released, it is used to apply tension to the molybdenum wire. Figure 2-Figure 3As shown, it consists of a receiver, receiver fixing screws, a spring slide shaft, an adjusting plug, a hook card, a dual-purpose figure-eight ring, and a hook.

[0040] The working principle and steps of the present invention are as follows: Figure 7 As shown in the figure, the working principle of a gravity-type automatic wire tightening method for a wire cutting machine is as follows:

[0041] After the weight mechanism is released, it slides vertically downward along the linear bearing driven by gravity, applying a constant, uniform, continuous, stable, and adjustable tension to the molybdenum wire via the tension pulley. During the movement of the molybdenum wire, if the wire becomes loose, the weight presses it down; if the wire becomes tight, the wire lifts the weight, applying a constant, uniform, and continuous force to every point on the wire, improving its running stability and eliminating loose wire on one side of the wire drum.

[0042] Specifically, Figure 7 a is the state of the weight being locked. Lift the weight upwards by hand, push the hook into the hook card, and lock the weight.

[0043] Figure 7 b is the state of the heavy hammer being released. Push the hook card by hand to make the hook come out of the hook card and release the heavy hammer. Figure 7 c. The heavy hammer is locked to facilitate the replacement and adjustment of molybdenum wire; Figure 7 d. The weight is released to provide tension for the molybdenum wire. When the molybdenum wire is loose, the weight presses down to tension the molybdenum wire. When the molybdenum wire is tight, the weight is lifted up by the molybdenum wire.

[0044] like Figure 1 、 Figure 7 、 Figure 8 As shown, a gravity-type automatic wire tightening method for a wire cutting machine includes the following steps: installing a heavy hammer type wire tightener, such as Figure 8 As shown in the figure, remove the original rear guide wheel of the wire cutting machine wire feeding arm, then install the heavy hammer type wire tightener to the wire feeding arm through the original guide wheel mounting hole and fasten it with screws.

[0045] Lock the hammer, such as Figure 7 As shown, before inserting the molybdenum wire, lift the weight upwards by hand and push the hook into the hook card to lock the weight.

[0046] Install molybdenum wire, such as Figure 8 As shown, the molybdenum wire is pulled out from the bottom of the wire drum, passes through the first wire guide wheel, passes around the tightening wheel, and finally passes through the second wire guide wheel and is fixed to the wire drum to complete the wire winding.

[0047] Release the weight and apply tension, e.g. Figure 8 As shown, push the hook card to disengage the hook, release the weight, and then start the wire drum to move the wire, so that the gravity acts evenly on every point of the molybdenum wire to achieve tensioning of the molybdenum wire.

[0048] Tension adjustment, such as Figure 1 As shown in the figure, the tension can be adjusted by adding or removing the counterweight on the weight. The unilateral loosening of the wire drum is eliminated by the continuous tightening force applied by the weight.

[0049] In this utility model, the figure-eight rings (two rings, a and b; the upper one is ring a, the lower one is ring b) are used: Figure-eight ring a is used to clamp the stainless steel shaft and secure the counterweight; Figure-eight ring b is used to clamp the stainless steel shaft and connect it to the tensioning wheel seat, where the hook is installed. The buffer spring is used to cushion the downward force of the counterweight when the molybdenum wire breaks, preventing damage to the tensioner body. The tensioning wheel seat is used to mount the tensioning wheel and, in combination with the figure-eight ring b, connects and secures the stainless steel shaft. The combined counterweight is used to apply gravity tension to the molybdenum wire, adjusting the wire tension by adding or removing the counterweight. The stainless steel shaft connects the counterweight to the tensioning wheel seat, moving vertically up and down via a linear bearing. The guide wheel seat is used to mount the guide wheel and linear bearing. The pin is combined with the guide wheel seat and is the mounting and securing component of the tensioner. The pressure plate is combined with the pin and is the mounting and securing component of the tensioner. Fastening screw: Combined with the guide wheel seat, pin, and pressure plate, it is the installation and fixing part of the wire tensioner. Guide wheels a and b: Used to guide the operation of the molybdenum wire. Dual-purpose figure eight ring: Used to fix the stainless steel optical axis and connect and fix it to the tension wheel seat. Tension wheel: Used to guide the operation of the molybdenum wire and apply tensioning force to the molybdenum wire. Stainless steel retaining ring: Used to fix the linear bearing. Specifically, retaining ring grooves are provided at both ends of the linear bearing. The stainless steel retaining ring is placed through the retaining ring groove to fix the linear bearing and prevent the linear bearing from slipping out of the linear bearing mounting hole. Linear bearing: Used to guide the optical axis to move vertically up and down. Pin screw: Used to fix the pin. Linear bearing mounting hole: Used to install linear bearings. Guide wheel mounting hole: Used to install the guide wheel. Receiver: Part of the weight locking and release mechanism, used to install the spring slide shaft. Spring slide shaft: Part of the weight locking and release mechanism, used to install the hook card. Receiver fixing screw: part of the weight locking and releasing mechanism, used to fix the receiver to the guide wheel seat. Hook card: part of the weight locking and releasing mechanism, installed on the spring slide shaft and cooperate with the hook. Adjusting plug: used to adjust the position of the spring slide shaft in the receiver. Figure-8 ring fixing screw: used to fix the dual-purpose figure-8 ring to the tensioning wheel seat. Dual-purpose figure-8 ring: used to clamp the stainless steel optical shaft and connect it to the tensioning wheel seat. Optical shaft locking screw: enables the dual-purpose figure-8 ring to clamp the stainless steel optical shaft. Hook: part of the weight locking and releasing mechanism, installed on the tensioning wheel seat and cooperate with the hook card. Tensioning wheel mounting hole: used to install the tensioning wheel.

[0050] like Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown in the figure, the working principle of a gravity-type automatic wire tightening method for a wire cutting machine is as follows:

[0051] Driven by gravity, the weighted wire tensioning mechanism moves vertically downward along the linear bearing, applying a constant, uniform, continuous, stable, and adjustable tension to the molybdenum wire through the wire tensioning wheel. During the movement of the molybdenum wire, when the wire becomes loose, the weighted wire presses down; when the wire becomes tight, the wire lifts the weighted wire up, applying a constant gravity evenly and continuously to every point of the molybdenum wire, improving the stability of the molybdenum wire and eliminating unilateral looseness of the wire drum. The size of the molybdenum wire tension is achieved by increasing or decreasing the counterweight of the weighted wire.

[0052] like Figure 1 、 Figure 7 、 Figure 8 As shown, a gravity-type automatic wire tightening method for a wire cutting machine includes the following steps: installing a heavy hammer type wire tightener, such as Figure 8 As shown, remove the original rear guide roller of the wire-cutting machine's wire transport arm, then install the heavy hammer type wire tightener on the wire transport arm through the original guide wheel mounting hole and fasten it with screws.

[0053] Lock the hammer, such as Figure 7 As shown, before inserting the molybdenum wire, lift it up with a heavy hammer, push the hook into the hook card to lock the heavy hammer; install the molybdenum wire, as shown in Figure 8 As shown in the figure, the molybdenum wire is pulled out from the bottom of the wire drum, passes through the first wire guide wheel, passes around the wire tension wheel, and finally passes through the second wire guide wheel and is fixed to the wire drum to complete the wire winding. Release the weight and apply tension; as shown in the figure, Figure 7 As shown, push the hook card to disengage the hook, release the weight, and then start the wire drum to move the wire, so that the gravity acts evenly on every point of the molybdenum wire to achieve tension on the molybdenum wire. Figure 1 As shown in the figure, the tension can be adjusted by adding or removing the counterweight on the weight. The unilateral loosening of the wire drum is eliminated by the constant, uniform and stable tightening force continuously applied by the weight.

Claims

1. A stable and adjustable gravity-type automatic wire tightening device suitable for wire cutting machine tools, characterized in that: The device comprises a first wire tightening mechanism for realizing the direction of the guide wire; and a gravity wire tightening mechanism detachably connected to the first wire tightening mechanism and for adjusting the tension of the molybdenum wire; The lower end of the gravity wire tightening mechanism is detachably connected to a weight locking and releasing mechanism, wherein the weight locking and releasing mechanism is used to lock or release the weight to provide tensioning force for the molybdenum wire.

2. The stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 1, characterized in that: The first wire tightening mechanism is provided with a wire guide wheel seat; At least two guide wheel mounting holes are provided at one end of the guide wheel seat; a first guide wheel and a second guide wheel are respectively provided in the guide wheel mounting holes; At least two linear bearing mounting holes are provided at the upper end of the guide wheel seat and between the guide wheel mounting holes; a first linear bearing and a second linear bearing are respectively provided in the linear bearing mounting holes.

3. The stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 2, characterized in that: One end of the guide wheel seat is connected to at least one pin via a pin screw; One side of the pin is fixedly connected with a compression plate via a fastening screw.

4. A stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 2 or 3, characterized in that: Stainless steel clamping rings are provided at both ends of the first linear bearing or the second linear bearing; A buffer spring is provided at one end of the first linear bearing or the second linear bearing and located at the guide wheel seat.

5. The stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 1 is characterized in that: The upper end of the gravity tensioning mechanism is provided with a combined weight for applying gravity tension to the molybdenum wire and adjusting the tension of the molybdenum wire by adding or removing the counterweight; The combined weight is detachably connected via at least two 8-shaped rings in combination with fastening screws and at least two stainless steel optical shafts.

6. A stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 1 or 5, characterized in that: A heavy hammer locking and releasing mechanism is provided at the lower end of the gravity tightening mechanism; The weight hammer locking and releasing mechanism is provided with a tightening wheel seat; the tightening wheel seat is detachably connected through at least one 8-shaped ring, combined with a fastening screw and at least two stainless steel optical shafts.

7. The stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 6, characterized in that: At least one tension wheel mounting hole is provided in the middle of the tension wheel seat; a tension wheel is provided in the tension wheel mounting hole; At least two protrusions are provided at the upper end of the tightening wheel mounting hole and on one side of the tightening wheel seat; and at least one plug hook is provided between the protrusions.

8. The stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 4, characterized in that: The guide wheel seat is fixedly connected to a casing via a fastening screw; A spring slide shaft is arranged inside the casing.

9. The stable and adjustable gravity-type automatic wire tightening device suitable for wire-cutting machine tools according to claim 8, characterized in that: The lower side of the spring slide shaft is fixedly connected with a hook card via a fastening screw.

10. A stable and adjustable gravity-type automatic wire tightening device suitable for a wire-cutting machine tool according to claim 8 or 9, characterized in that: One end of the spring slide shaft is provided with an adjustment plug for adjusting the position of the spring slide shaft in the casing.

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