Gantry structure of electric spark machine tool and electric spark machine thereof

Abstract

The application discloses a gantry structure of an electric spark machine tool and the electric spark machine tool, gear mechanisms driven by servo motors are arranged at two ends of a machine tool base, the gear mechanisms synchronously drive horizontal lead screws inside limiting seats from the two ends; when the horizontal lead screws drive the gantry to move forward and backward, the limiting mechanism ensures that a vertical part of the gantry moves horizontally in a sliding groove of the limiting seat; when the gantry moves forward and backward, piston rods on the gantry compress gas inside a gas tank, thereby buffering the forward and backward movement of the gantry, and the connection between the piston rods and the gantry prevents the top of the gantry from shaking when the gantry moves forward and backward. The application synchronously drives the horizontal lead screws from the two ends, further improves the smoothness of the rotation of the horizontal lead screws, thereby realizing the smoothness when the horizontal lead screws drive the gantry to move forward and backward; through the arrangement of the limiting mechanism, the horizontal lead screws can be prevented from being bent and deformed, thereby ensuring that the horizontal lead screws drive the gantry more smoothly.

Description

Technical Field

[0001] This invention relates to the field of electrical discharge machine technology, specifically to a gantry structure for an electrical discharge machine tool and the electrical discharge machine thereof. Background Technology

[0002] Common EDM machines include column-type and bullhead-type EDM machines. Both types fix the machine head to a gantry structure, and the movement of the gantry structure on the base allows the machine head to move, enabling precise machining of the workpiece on the base. However, the gantry structure is easily limited by the drive mechanism itself during movement. For example, swaying during movement, bending or deformation of the drive screw, and poor support at the lower end of the gantry can all lead to uneven movement of the gantry structure, resulting in unstable machining accuracy of the workpiece. Therefore, we have introduced a gantry structure for an EDM machine and its corresponding EDM machine. Summary of the Invention

[0003] The purpose of this invention is to provide a gantry structure for an electrical discharge machine tool and an electrical discharge machine thereof, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A gantry structure for an electrical discharge machine tool includes a gantry frame, a base, and limit seats fixed to the lower parts of both sides thereon. The base and the limit seats on both sides form a machine tool base. The two ends of the machine tool base are provided with gear mechanisms driven by servo motors. The gear mechanisms synchronously transmit power to the horizontal lead screws inside the limit seats from both ends.

[0006] The lower end of the vertical part of the gantry frame is detachably fixed with a limiting mechanism, and the two ends of the horizontal screw pass through the bottom of the vertical part of the gantry frame and the two ends of the limiting mechanism. When the horizontal screw drives the gantry frame to move back and forth, the limiting mechanism ensures that the vertical part of the gantry frame remains horizontal in the slide groove of the limiting seat.

[0007] Air tanks are installed at the two diagonally opposite corners of the upper part of the chute. A piston is installed inside the air tank. The piston rod at the inner end of the piston passes through the air tank and is connected to the protrusion on the side of the vertical part of the gantry.

[0008] When the gantry moves back and forth, it drives the piston rod on it to compress the gas inside the gas tank, thereby buffering the back and forth movement of the gantry. At the same time, the connection between the piston rod and the gantry prevents the top of the gantry from swaying back and forth when the gantry moves back and forth.

[0009] Preferably, the gear mechanism includes side gears located at the front and rear ends of the limiting seat, and drive gears and intermediate gears at the front and rear ends of the base;

[0010] The two ends of the horizontal lead screw pass through the first bearing on the limiting seat and are then fixedly connected to the middle of the side gear.

[0011] The base has a connecting shaft inside, on which two sets of second bearings are sleeved, and the second bearings are fixed inside the base. The two ends of the connecting shaft pass through the base and are fixedly connected to the middle of the drive gear.

[0012] The connecting pin fixed in the middle of the intermediate gear is inserted into the corresponding round hole on the base, and the intermediate gear meshes between the drive gear and the side gear.

[0013] The rear end of the connecting shaft passes through the rear drive gear and is connected to the motor shaft at the output end of the servo motor.

[0014] The front and rear ends of the machine tool base are fixed with a front cover and a rear cover by a first bolt, and the front cover and the rear cover cover the outside of the front and rear gear mechanisms respectively. The servo motor is fixed in the middle of the rear end of the rear cover.

[0015] Preferably, the limiting mechanism includes a connecting frame, L-shaped fastening plates inserted on both sides inside the connecting frame, a limiting frame fixed on both sides outside the connecting frame by a second bolt, a support wheel movably connected between the bottoms of the two sets of limiting frames by a wheel axle, and two sets of front and rear horizontal rollers movably connected in the middle of the limiting frame.

[0016] The support wheel is supported at the bottom of the chute, and the horizontal roller is supported on the side wall of the chute;

[0017] The inner side wall of the limiting frame is provided with a limiting block, which is inserted into the limiting groove on the outer side wall of the connecting frame. The spring at the top of the limiting frame is connected to the lower end of the upper horizontal part of the L-shaped fastening plate, and the lower end of the upper horizontal part of the L-shaped fastening plate is provided with two sets of semi-circular blocks.

[0018] The inner wall of the L-shaped fastening plate is provided with a protruding plate. After the lower end of the vertical part of the gantry frame is inserted between the two sets of L-shaped fastening plates, the lower end of the vertical part of the gantry frame contacts the protruding plate, causing the L-shaped fastening plate to move down, thereby causing the slot at the bottom of the L-shaped fastening plate to be locked on the outside of the wheel axle, and locking the support wheel between the bottom of the two sets of L-shaped fastening plates.

[0019] When the L-shaped fastening plate moves down until the semi-circular block supports the top of the limiting frame, the L-shaped fastening plate moves towards the lower side wall of the vertical part of the gantry frame with the semi-circular block as the center, until the locking block on the inner side wall of the L-shaped fastening plate is engaged in the locking groove on the lower side of the vertical part of the gantry frame.

[0020] In addition, to achieve the above objectives, the present invention also provides an electrical discharge machine, including the gantry structure of the aforementioned electrical discharge machine tool.

[0021] Compared with the prior art, the beneficial effects of the present invention are: the servo motor drives the gear mechanism of the present invention, so that the gear mechanism synchronously transmits the horizontal lead screw inside the limit seat from both ends. This can avoid the uneven rotation of the horizontal lead screw and the other end when driven from one end, and further improve the smoothness of the horizontal lead screw rotation, thereby achieving the smoothness of driving the gantry frame to move back and forth.

[0022] When the horizontal screw drives the gantry to move back and forth, the limiting mechanism ensures that the vertical part of the gantry remains horizontal in the groove of the limiting seat. At the same time, the gantry is installed in place with the limiting mechanism under its own weight. At this time, the setting of the limiting mechanism can prevent the horizontal screw from bending and deforming, thereby ensuring that the horizontal screw drives the gantry more smoothly.

[0023] When the gantry moves back and forth, it drives the piston rod on it to compress the gas inside the gas tank, thereby buffering the back and forth movement of the gantry. At the same time, the connection between the piston rod and the gantry prevents the top of the gantry from swaying back and forth when the gantry moves back and forth, further ensuring the smoothness of the gantry's back and forth movement. Attached Figure Description

[0024] Figure 1 This is an exploded structural diagram of the entire invention;

[0025] Figure 2 This is a three-dimensional structural diagram of the servo motor, gear mechanism, and horizontal lead screw connection of the present invention.

[0026] Figure 3 This is an exploded structural diagram of the limiting mechanism of the present invention;

[0027] Figure 4 This is a cross-sectional structural diagram showing the connection between the limiting mechanism, the limiting seat, and the vertical part of the gantry frame of the present invention.

[0028] Figure 5 This is a cross-sectional structural diagram showing the connection between the horizontal lead screw, the vertical part of the gantry frame, and the gas tank in this invention.

[0029] Figure 6 This is a three-dimensional structural diagram of the entire invention.

[0030] In the diagram: 1. Limiting seat; 2. Rear end cover; 3. Front end cover; 4. First bolt; 5. Base; 6. Slide groove; 7. Gear mechanism; 71. Side gear; 72. Drive gear; 73. Intermediate gear; 74. Connecting pin; 8. Servo motor; 9. Gantry frame; 91. Slot; 10. Protrusion; 11. Limiting mechanism; 110. Connecting frame; 1101. Limiting groove; 1102. Clearance groove; 111. Second bolt; 112. Limiting bracket; 1121. Spring; 1122. Horizontal roller; 1123. Limiting block; 113. L-shaped fastening plate; 1131. Semi-circular block; 1132. Locking block; 1133. Protruding plate; 1134. Slot; 114. Support wheel; 1140. Wheel axle; 12. Horizontal lead screw; 13. Connecting shaft; 14. Second bearing; 15. Air tank; 16. Piston rod; 17. Piston; 18. First bearing. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-6 The present invention provides a technical solution:

[0033] A gantry structure for an electrical discharge machine tool includes a gantry frame 9, a base 5, and limit seats 1 fixed on the lower parts of both sides thereon. The base 5 and the limit seats 1 on both sides thereon form a machine tool base. The two ends of the machine tool base are provided with gear mechanisms 7 driven by servo motors 8. The gear mechanisms 7 synchronously transmit the horizontal lead screws 12 inside the limit seats 1 from both ends.

[0034] like Figure 2 As shown, the gear mechanism 7 includes side gears 71 located at the front and rear ends of the limiting seat 1, and drive gears 72 and intermediate gears 73 located at the front and rear ends of the base 5; the front and rear ends of the machine tool base are fixed with a front cover 3 and a rear cover 2 by a first bolt 4, and the front cover 3 and the rear cover 2 cover the outside of the gear mechanism 7 at the front and rear ends respectively, and the servo motor 8 is fixed at the middle of the rear end of the rear cover 2.

[0035] Lubricating oil is added inside the front cover 3 and the rear cover 2 to lubricate the side gear 71, drive gear 72 and intermediate gear 73 when they are working.

[0036] The two ends of the horizontal lead screw 12 pass through the first bearing 18 on the limiting seat 1 and are fixedly connected to the middle of the side gear 71. The setting of the first bearing 18 improves the smoothness of the horizontal lead screw 12 when rotating.

[0037] The base 5 has a connecting shaft 13 inside, on which two sets of second bearings 14 are sleeved and fixed inside the base 5. The two ends of the connecting shaft 13 pass through the base 5 and are fixedly connected to the middle of the drive gear 72. The smoothness of the rotation of the connecting shaft 13 is achieved by the setting of the second bearings 14.

[0038] The connecting pin 74 fixed in the middle of the intermediate gear 73 is inserted into the corresponding round hole on the base 5, and the intermediate gear 73 meshes between the drive gear 72 and the side gear 71.

[0039] The rear end of the connecting shaft 13 passes through the rear drive gear 72 and is connected to the motor shaft at the output end of the servo motor 8.

[0040] The lower end of the vertical part of the gantry frame 9 is detachably fixed with a limiting mechanism 11, and the two ends of the horizontal screw 12 pass through the bottom of the vertical part of the gantry frame 9 and the two ends of the limiting mechanism 11. When the horizontal screw 12 drives the gantry frame 9 to move back and forth, the limiting mechanism 11 ensures that the vertical part of the gantry frame 9 remains horizontal in the slide groove 6 of the limiting seat 1.

[0041] A nut is fixed inside the vertical part of the gantry frame 9 and sleeved on the outside of the horizontal lead screw 12. The nut contains a steel ball and a steel ball retainer. The nut, steel ball, steel ball retainer and horizontal lead screw 12 together form a ball screw.

[0042] like Figure 3 and 4 As shown, the limiting mechanism 11 includes a connecting frame 110, L-shaped fastening plates 113 inserted into the inner sides of the connecting frame 110, a limiting frame 112 fixed to the outer sides of the connecting frame 110 by a second bolt 111, a support wheel 114 movably connected between the bottoms of the two sets of limiting frames 112 by a wheel axle 1140, and two sets of front and rear horizontal rollers 1122 movably connected in the middle of the limiting frame 112.

[0043] The support wheel 114 is supported at the bottom of the slide groove 6, and the horizontal roller 1122 is supported on the side wall of the slide groove 6;

[0044] The limiting frame 112 has a limiting block 1123 in the middle of the inner side wall, which is inserted into the limiting groove 1101 on the outer side wall of the connecting frame 110. The spring 1121 at the top of the limiting frame 112 is connected to the lower end of the upper horizontal part of the L-shaped fastening plate 113, and the lower end of the upper horizontal part of the L-shaped fastening plate 113 has two sets of semi-circular blocks 1131.

[0045] The inner wall of the L-shaped fastening plate 113 is provided with a protruding plate 1133. After the lower end of the vertical part of the gantry frame 9 is inserted between the two sets of L-shaped fastening plates 113, the lower end of the vertical part of the gantry frame 9 contacts the protruding plate 1133, causing the L-shaped fastening plate 113 to move down, thereby causing the slot 1134 at the bottom of the L-shaped fastening plate 113 to be locked on the outside of the wheel axle 1140, and locking the support wheel 114 between the bottom of the two sets of L-shaped fastening plates 113.

[0046] When the L-shaped fastening plate 113 moves down until the semi-circular block 1131 is supported on the top of the limiting frame 112, the L-shaped fastening plate 113 moves towards the lower side wall of the vertical part of the gantry frame 9 with the semi-circular block 1131 as the center, until the locking block 1132 on the inner side wall of the L-shaped fastening plate 113 is engaged in the locking groove 91 on the lower side of the vertical part of the gantry frame 9.

[0047] The outer sidewall of the connecting frame 110 is also provided with a clearance groove 1102, and the inner side of the horizontal roller 1122 passes through the clearance groove 1102.

[0048] Gas tanks 15 are installed at the two diagonally opposite corners of the upper part of the slide 6. When the gantry 9 moves back and forth, it drives the piston rod 16 on it to compress the gas inside the gas tank 15, thereby buffering the back and forth movement of the gantry 9. At the same time, the connection between the piston rod 16 and the gantry 9 prevents the top of the gantry 9 from swaying back and forth when the gantry 9 moves back and forth.

[0049] like Figure 5 As shown, the gas tank 15 is equipped with a piston 17 inside. The piston rod 16 at the inner end of the piston 17 passes through the gas tank 15 and is connected to the protrusion 10 on the side of the vertical part of the gantry frame 9.

[0050] In addition, to achieve the above objectives, the present invention also provides an electrical discharge machine, including the gantry structure of the aforementioned electrical discharge machine tool.

[0051] Specifically, in use, two sets of L-shaped fastening plates 113 are inserted between the lower ends of the vertical part of the gantry frame 9. The lower ends of the vertical part of the gantry frame 9 are in contact with the protruding plate 1133. Under the gravity of the gantry frame 9, the L-shaped fastening plates 113 move down (at this time, the spring 1121 is in a state of gradual compression), so that the slot 1134 at the bottom of the L-shaped fastening plate 113 is locked on the outside of the wheel axle 1140, and the support wheel 114 is locked between the bottom of the two sets of L-shaped fastening plates 113.

[0052] This further limits the positioning of the support wheel 114, with its two ends tightly attached to the inner wall of the bottom of the L-shaped fastening plate 113. When the gantry 9 moves back and forth and the support wheel 114 rolls along the slide groove 6, it prevents the support wheel 114 from moving axially along the wheel axle 1140. This makes the rolling of the support wheel 114 smoother and further ensures the smoothness of the gantry 9 moving back and forth.

[0053] When the L-shaped fastening plate 113 moves downward until the semi-circular block 1131 supports the top of the limiting frame 112, under the gravity of the gantry 9, the L-shaped fastening plate 113 moves towards the lower side wall of the vertical part of the gantry 9 with the semi-circular block 1131 as the center, until the locking block 1132 on the inner side wall of the L-shaped fastening plate 113 engages with the locking groove 91 on the lower side of the vertical part of the gantry 9 (e.g., Figure 4 As shown, this allows for a tight connection between the gantry frame 9 and the limiting mechanism 11, and the front and rear side walls of the vertical part of the gantry frame 9 are tightly attached to the front and rear inner walls of the connecting frame 110.

[0054] Furthermore, the support wheel 114 is supported at the bottom of the slide 6, and the horizontal roller 1122 is supported on the side wall of the slide 6. In this way, when the horizontal screw 12 drives the gantry 9 to move back and forth through the limiting mechanism 11, the smoothness of the limiting mechanism 11 in the slide 6 can be ensured, and the limiting mechanism 11 will not wobble. This makes the gantry 9 move back and forth smoothly, and also avoids the horizontal screw 12 from bending due to the uneven movement of the limiting mechanism 11.

[0055] Meanwhile, after the gantry 9 and the limiting mechanism 11 are installed in place, the slot 1134 at the bottom of the L-shaped fastening plate 113 is locked on the outside of the wheel axle 1140. This can fix the L-shaped fastening plate 113 in the vertical direction, and the lower end of the vertical part of the gantry 9 is supported on the protruding plate 1133, thereby preventing the vertical part of the gantry 9 from moving further downward, and further preventing the gantry 9 from pressing down on the horizontal screw 12 due to its own weight, which would cause the horizontal screw 12 to bend, thereby ensuring the drive of the horizontal screw 12 on the gantry 9.

[0056] The servo motor 8 operates, causing the drive gears 72 at both ends of the machine tool base to rotate simultaneously. Since the intermediate gear 73 meshes between the drive gear 72 and the side gear 71, the side gears 71 at both ends of the horizontal lead screw 12 rotate simultaneously. This enables the horizontal lead screw 12 to be driven to rotate simultaneously from both ends. This avoids uneven rotation between the horizontal lead screw 12 and the other end when driven from one end, further improving the smoothness of the rotation of the horizontal lead screw 12, thereby achieving smoothness when driving the gantry 9 to move back and forth.

[0057] Air tanks 15 are installed at the two diagonally opposite corners of the upper part of the slide 6. When the gantry 9 moves back and forth, it drives the piston rod 16 on it to move along the air tank 15, so that the piston 17 inside the air tank 15 compresses the gas inside the air tank 15. The piston 17 is subjected to the resistance of gas compression, thus buffering the back and forth movement of the gantry 9. At the same time, the connection between the piston rod 16 and the gantry 9 plays a role in preventing the top of the gantry 9 from swaying back and forth when the gantry 9 moves back and forth.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gantry structure for an electrical discharge machine tool, comprising a gantry frame, a base, and limiting seats fixed to the lower parts of both sides of the base, characterized in that: The base and the limiting seats on both sides form a machine tool base. The two ends of the machine tool base are equipped with gear mechanisms driven by servo motors. The gear mechanisms synchronously transmit power to the horizontal lead screws inside the limiting seats from both ends. The lower end of the vertical part of the gantry frame is detachably fixed with a limiting mechanism, and the two ends of the horizontal screw pass through the bottom of the vertical part of the gantry frame and the two ends of the limiting mechanism. When the horizontal screw drives the gantry frame to move back and forth, the limiting mechanism ensures that the vertical part of the gantry frame remains horizontal in the slide groove of the limiting seat. Gas tanks are installed at the two diagonally opposite corners of the upper part of the chute. When the gantry moves back and forth, it drives the piston rod on it to compress the gas inside the gas tank, thereby buffering the back and forth movement of the gantry. At the same time, the connection between the piston rod and the gantry prevents the top of the gantry from swaying back and forth when the gantry moves back and forth. The limiting mechanism includes a connecting frame, L-shaped fastening plates inserted on both sides inside the connecting frame, a limiting frame fixed on both sides outside the connecting frame by a second bolt, a support wheel movably connected between the bottoms of the two sets of limiting frames by a wheel axle, and two sets of front and rear horizontal rollers movably connected in the middle of the limiting frame. The support wheel is supported at the bottom of the chute, and the horizontal roller is supported on the side wall of the chute; The inner side wall of the limiting frame is provided with a limiting block, which is inserted into the limiting groove on the outer side wall of the connecting frame. The spring at the top of the limiting frame is connected to the lower end of the upper horizontal part of the L-shaped fastening plate, and the lower end of the upper horizontal part of the L-shaped fastening plate is provided with two sets of semi-circular blocks. The inner wall of the L-shaped fastening plate is provided with a protruding plate. After the lower end of the vertical part of the gantry frame is inserted between the two sets of L-shaped fastening plates, the lower end of the vertical part of the gantry frame contacts the protruding plate, causing the L-shaped fastening plate to move down, thereby causing the slot at the bottom of the L-shaped fastening plate to be locked on the outside of the wheel axle, and locking the support wheel between the bottom of the two sets of L-shaped fastening plates. When the L-shaped fastening plate moves down until the semi-circular block supports the top of the limiting frame, the L-shaped fastening plate moves towards the lower side wall of the vertical part of the gantry frame with the semi-circular block as the center, until the locking block on the inner side wall of the L-shaped fastening plate is engaged in the locking groove on the lower side of the vertical part of the gantry frame.

2. The gantry structure of an EDM machine tool according to claim 1, characterized in that: The gear mechanism includes side gears located at the front and rear ends of the limiting seat, as well as drive gears and intermediate gears at the front and rear ends of the base. The two ends of the horizontal lead screw pass through the first bearing on the limiting seat and are then fixedly connected to the middle of the side gear. The base has a connecting shaft inside, on which two sets of second bearings are sleeved, and the second bearings are fixed inside the base. The two ends of the connecting shaft pass through the base and are fixedly connected to the middle of the drive gear. The connecting pin fixed in the middle of the intermediate gear is inserted into the corresponding round hole on the base, and the intermediate gear meshes between the drive gear and the side gear. The rear end of the connecting shaft passes through the rear drive gear and is connected to the motor shaft at the output end of the servo motor.

3. The gantry structure of an EDM machine tool according to claim 2, characterized in that: The front and rear ends of the machine tool base are fixed with a front cover and a rear cover by a first bolt, and the front cover and the rear cover cover the outside of the front and rear gear mechanisms respectively. The servo motor is fixed in the middle of the rear end of the rear cover.

4. The gantry structure of an EDM machine tool according to claim 1, characterized in that: The gas tank is equipped with a piston inside, and the piston rod at the inner end of the piston passes through the gas tank and is connected to a protrusion on the side of the vertical part of the gantry frame.

5. The gantry structure of an EDM machine tool according to claim 1, characterized in that: The outer sidewall of the connecting frame is also provided with a clearance groove, and the inner side of the horizontal roller passes through the clearance groove.

6. An electrical discharge machine, characterized in that, Including the gantry structure of the EDM machine tool as described in any one of claims 1-5.

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