CN218946888U

CN218946888U - Mould steel wire cutting and polishing integrated device

Info

Publication number: CN218946888U
Application number: CN202222339996.1U
Authority: CN
Inventors: 苍建龙
Original assignee: Kunshan Auma Thermal Engineering Tech Co ltd
Current assignee: Kunshan Auma Thermal Engineering Tech Co ltd
Priority date: 2022-09-03
Filing date: 2022-09-03
Publication date: 2023-05-02
Anticipated expiration: 2032-09-03

Abstract

The utility model discloses a die steel wire cutting and polishing integrated device, which relates to the technical field of die steel processing and comprises a workbench, a wire cutting unit and a polishing unit; a polishing unit is arranged at the front side of the upper end of the workbench; the cutting unit comprises a U-shaped base, a sliding rod, a first T-shaped sliding block, an I-shaped sliding block, a motor I, a fixed block I, a screw I, a connecting block, a linear cutting tool and a movable assembly, wherein a rectangular groove is formed in the center of the upper end of the workbench, the left end and the right end of the inner wall of the rectangular groove are respectively and fixedly connected with the lower sides of the two ends of the U-shaped base, the sliding rod is arranged on the lower side of the opposite end of the U-shaped base, the middle part of the periphery of the sliding rod is transversely and movably connected with a sliding hole on the upper side of the first T-shaped sliding block, the structural design of the sliding rod is stable for cutting die steel, the die steel is difficult to generate dislocation during cutting, the flatness of a cutting surface is guaranteed, the quality of a finished product is improved, the overall structure is efficient for polishing the die steel, and the probability of burr production is reduced.

Description

Mould steel wire cutting and polishing integrated device

Technical Field

The utility model relates to the technical field of die steel processing, in particular to a die steel wire cutting and polishing integrated device.

Background

The die steel is a steel grade used for manufacturing dies such as a cold die, a hot die, and a die-casting die. The mould is the main processing tool for manufacturing parts in the industrial departments of mechanical manufacturing, radio instruments, motors, electric appliances and the like. The quality of the mould directly affects the quality of the press working process, the precision output and the production cost of the product, the quality and the service life of the mould are mainly affected by the mould material and the heat treatment except by reasonable structural design and the machining precision, in the machining of the mould steel, wire cutting and polishing operation are needed, the wire cutting generally refers to wire cutting of electric spark, and the wire cutting machine belongs to the field of electric machining.

In the prior art, part of structural design is not stable enough to the cutting of die steel, and die steel produces dislocation easily and leads to the cutting face crooked when the cutting, has reduced finished product quality, and part of structure is not high enough to the grinding of die steel, has increased the probability that deckle edge produced, for this reason, we propose a die steel wire cutting and grinding integrative device.

Disclosure of Invention

The utility model aims to overcome the existing defects, and provides the die steel wire cutting and polishing integrated device, the structural design of which is stable for cutting die steel, the die steel is not easy to generate dislocation during cutting, the flatness of a cutting surface is ensured, the quality of a finished product is improved, the polishing of the die steel by the integral structure is more efficient, the probability of burrs is reduced, and the problems in the background art can be effectively solved.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the die steel wire cutting and polishing integrated device comprises a workbench, a wire cutting unit and a polishing unit;

a working table: a polishing unit is arranged at the front side of the upper end of the upper part;

and a cutting unit: the wire cutting device comprises a U-shaped base, a sliding rod, a first T-shaped sliding block, an I-shaped sliding block, a motor I, a fixed block I, a screw rod I, a connecting block I, a wire cutting tool and a movable assembly, wherein a rectangular groove is formed in the center of the upper end of the workbench, the left end and the right end of the inner wall of the rectangular groove are respectively and fixedly connected with the lower sides of the two ends of the U-shaped base, the sliding rod is arranged on the lower side of the opposite end of the U-shaped base, the middle part of the periphery of the sliding rod is transversely and movably connected with a sliding hole on the upper side of the first T-shaped sliding block, the upper end of the U-shaped base is provided with a strip-shaped groove, the inner wall of the strip-shaped groove is transversely and movably connected with the outer side of the I-shaped sliding block, the left side of the upper end of the U-shaped base is provided with the motor I-shaped sliding block I, the right side of the upper end of the U-shaped base is provided with the fixed block I-shaped base, the output shaft of the motor I-shaped base is fixedly connected with one end of the screw rod I-shaped base, the other end of the screw rod I-shaped base is rotationally connected with the inner end of the fixed block I-shaped sliding block I, the upper end of the I-shaped sliding block is provided with the connecting block, the connecting block is provided with the threaded holes at the middle of the periphery of the I-shaped sliding block, the upper end is, the opposite end is provided with the I-shaped sliding tool is respectively, and the I-shaped sliding block is.

The whole cutting structure of polishing is supported to the workstation, promote the machining stability of mould steel, the cutting is polished earlier with mould steel fixed position, then with wire cut instrument displacement to outside, cut the operation after fixing, the position of the fixed slide bar of U type base, make first T type slider can move along the direction of slide bar, during the cutting, open motor one, drive screw rod one and rotate under the restriction of fixed block one, further threaded connection connecting block, control I-shaped slider moves along the direction of strip type groove, in order to guarantee the synchronism of cutting operation, need open movable assembly, wire cut instrument between first T type slider and the I-shaped slider keeps synchronous movement, use outside isolated plant to carry out pulse current's adding to hold to wire cut instrument, utilize pulse current discharge's corrosive action to cut the processing to the work piece.

Further, the movable assembly comprises a second motor and a second screw rod, the lower end of the left side of the U-shaped base is provided with the second motor, an output shaft of the second motor is fixedly connected with one end of the second screw rod, the other end of the second screw rod is rotationally connected with the inner end of the U-shaped base, the middle part of the periphery of the second screw rod is in threaded connection with a threaded hole on the lower side of the first T-shaped sliding block, and the input end of the second motor is electrically connected with the output end of an external power supply through an external control switch group. When the first T-shaped sliding block is controlled to synchronously move, the motor II at the lower end of the left side of the U-shaped base is opened to drive the screw rod II to rotate under the limitation of the U-shaped base, so that the screw rod II is connected with the first T-shaped sliding block in a threaded manner, and the screw rod II is driven to move along the direction of the sliding rod.

Further, the unit of polishing includes second T type slider, motor III, polishing wheel, fixed block II and electronic hydraulic stem, the spout has been seted up on the upper end right side of workstation, and the both sides of the horizontal swing joint second T type slider of spout inner wall, the one end of fixed connection motor III is passed through to the upper end of second T type slider, the one end of motor III's output shaft fixed connection polishing wheel, the lower extreme of workstation is located the left side of spout and is equipped with the fixed block II, the inner of fixed block II is equipped with electronic hydraulic stem, the left end of the inner fixed connection second T type slider of electronic hydraulic stem, the input of motor III is connected with external power source's output electricity through external control switch group. After cutting the die steel, the grinding operation of the cutting surface needs to be performed, the second T-shaped sliding block is controlled to move along the direction of the sliding groove by using the electric hydraulic rod on the second fixed block, the displacement stability is improved, and the motor III is turned on to drive the grinding wheel to rotate at a high speed, so that the grinding operation is performed on the cutting surface of the die steel.

Further, still include the clamping unit, the clamping unit includes T type grip block, fixed block III, two-way screw rod and gear, a pair of spacing groove has been seted up in the upper end left side of workstation, and two spacing inslot sides are equipped with T type grip block, the lower extreme of workstation is located the both sides of two spacing grooves and is equipped with a fixed block III respectively, and the both ends of two-way screw rod are connected in the rotation of the relative one end of two fixed blocks III, the screw hole of two T type grip block downside of threaded connection respectively in the peripheral both sides of two-way screw rod, the screw thread direction of two sides of two-way screw rod is opposite, the peripheral middle part of two-way screw rod is equipped with the gear. When the cutting operation of die steel is carried out, the die steel is required to be clamped and fixed firstly, the movable positions of the two-way screw rods are limited by the three fixed blocks, and when the positions of the T-shaped clamping blocks are adjusted, the external transmission device is used for meshing gears, so that the two-way screw rods drive the two T-shaped clamping blocks to move along the direction of the limiting grooves through the threaded holes, the clamping positions can be adjusted according to die steel with different sizes, and the clamping flexibility is improved.

Further, still include the rubber pad, the draw-in groove has been seted up to the inner upside of T type grip block, and the draw-in groove inner wall is equipped with the rubber pad. When the T-shaped clamping blocks are clamped by the rubber pad, a certain protection function is provided, and two sides of the die steel are prevented from being worn.

Further, the workbench further comprises supporting legs, one supporting leg is arranged at each of four corners of the lower end of the workbench, and anti-tilting rods are arranged at the lower sides of the opposite ends of the left and right pairs of supporting legs. The landing leg supports workstation overall structure, promotes the stability that linear cutting polished.

Compared with the prior art, the utility model has the beneficial effects that: this integrative device of mould steel wire cutting grinding has following benefit:

1. the die steel wire cutting and polishing integrated device is provided with the wire cutting tools with two ends capable of synchronously moving, and the first T-shaped sliding block and the I-shaped sliding block are controlled to synchronously move by the motor I and the motor II, so that the stability of the die steel wire cutting tools during cutting is ensured, and the cutting surface is prevented from being skewed;

2. according to the die steel wire cutting and polishing integrated device, the die steel can be ensured to be stable during online cutting and polishing through the clamping of the T-shaped clamping blocks, and the cutting surface is flexibly polished by utilizing the reciprocating polishing wheel;

3. this integrative device of polishing is cut to mould steel wire, its structural design is comparatively stable to the cutting of mould steel, and the mould steel is difficult for producing dislocation and has guaranteed the roughness of cutting surface when the cutting, has promoted finished product quality, and overall structure is comparatively high-efficient to the polishing of mould steel, has reduced the probability that deckle edge produced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

fig. 2 is a schematic view of a partial bottom view structure of the present utility model.

In the figure: the device comprises a workbench, a 2 linear cutting unit, a 21U-shaped base, a 22 sliding rod, a 23 first T-shaped sliding block, a 24I-shaped sliding block, a 25 motor I, a 26 fixed block I, a 27 screw I, a 28 connecting block, a 29 linear cutting tool, a 210 motor II, a 211 screw II, a 3 polishing unit, a 31 second T-shaped sliding block, a 32 motor III, a 33 polishing wheel, a 34 fixed block II, a 35 electric hydraulic rod, a 4 clamping unit, a 41T-shaped clamping block, a 42 fixed block III, a 43 bidirectional screw, a 44 gear, a 5 rubber pad and a 6 supporting leg.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, the present embodiment provides a technical solution: the die steel wire cutting and polishing integrated device comprises a workbench 1, a wire cutting unit 2 and a polishing unit 3;

work table 1: a polishing unit 3 is arranged at the front side of the upper end of the upper part;

the polishing unit 3 comprises a second T-shaped sliding block 31, a third motor 32, a polishing wheel 33, a second fixing block 34 and an electric hydraulic rod 35, wherein a sliding groove is formed in the right side of the upper end of the workbench 1, the inner wall of the sliding groove is transversely and movably connected with two sides of the second T-shaped sliding block 31, the upper end of the second T-shaped sliding block 31 is fixedly connected with one end of the third motor 32, an output shaft of the third motor 32 is fixedly connected with one end of the polishing wheel 33, the lower end of the workbench 1 is provided with a second fixing block 34 on the left side of the sliding groove, the inner end of the second fixing block 34 is provided with the electric hydraulic rod 35, the inner end of the electric hydraulic rod 35 is fixedly connected with the left end of the second T-shaped sliding block 31, and the input end of the third motor 32 is electrically connected with the output end of an external power supply through an external control switch group. After the die steel is cut, the grinding operation of the cutting surface is required, the electric hydraulic rod 35 on the second fixing block 34 is used for controlling the second T-shaped sliding block 31 to move along the direction of the sliding groove, the displacement stability is improved, and the third motor 32 is started to drive the grinding wheel 33 to rotate at a high speed, so that the grinding operation is performed on the cutting surface of the die steel.

Cutting unit 2: comprises a U-shaped base 21, a slide bar 22, a first T-shaped slide block 23, an I-shaped slide block 24, a motor one 25, a fixed block one 26, a screw one 27, a connecting block 28, a linear cutting tool 29 and a movable component, wherein the center of the upper end of the workbench 1 is provided with a rectangular groove, the left and right ends of the inner wall of the rectangular groove are respectively and fixedly connected with the lower sides of the two ends of the U-shaped base 21, the lower sides of the opposite ends of the U-shaped base 21 are provided with the slide bar 22, the middle part of the periphery of the slide bar 22 is transversely and movably connected with a slide hole on the upper side of the first T-shaped slide block 23, the upper end of the U-shaped base 21 is provided with a strip-shaped groove, the inner wall of the strip-shaped groove is transversely and movably connected with the outer side of the I-shaped slide block 24, the left side of the upper end of the U-shaped base 21 is provided with a first motor 25, the right side of the upper end of the U-shaped base 21 is provided with a first fixed block 26, an output shaft of the first motor 25 is fixedly connected with one end of a first screw rod 27, the other end of the first screw rod 27 is rotationally connected with the inner end of the first fixed block 26, the upper end of the I-shaped sliding block 24 is provided with a connecting block 28, the middle of the periphery of the first screw rod 27 is in threaded connection with threaded holes at two ends of the connecting block 28, the opposite ends of the first T-shaped sliding block 23 and the I-shaped sliding block 24 are provided with linear cutting tools 29, and the input end of the first motor 25 is electrically connected with the output end of an external power supply through an external control switch group.

The workbench 1 supports the integral cutting and polishing structure, improves the processing stability of die steel, fixes the position of the die steel before cutting and polishing, then moves the wire cutting tool 29 to the outermost side, performs cutting operation after fixing, fixes the position of the sliding rod 22 by the U-shaped base 21, enables the first T-shaped sliding block 23 to move along the direction of the sliding rod 22, and when cutting, turns on the motor I25 to drive the screw I27 to rotate under the limit of the fixed block I26, further connects the connecting block 28 through threads, controls the I-shaped sliding block 24 to move along the direction of the strip-shaped groove, and in order to ensure the synchronism of cutting operation, needs to turn on the movable assembly, controls the wire cutting tool 29 between the first T-shaped sliding block 23 and the I-shaped sliding block 24 to move synchronously, uses an external special device to hold the wire cutting tool 29 by pulse current, and performs cutting operation on a workpiece by utilizing the corrosion effect of pulse current discharge.

The movable assembly comprises a second motor 210 and a second screw rod 211, the lower end of the left side of the U-shaped base 21 is provided with the second motor 210, an output shaft of the second motor 210 is fixedly connected with one end of the second screw rod 211, the other end of the second screw rod 211 is rotationally connected with the inner end of the U-shaped base 21, the middle part of the periphery of the second screw rod 211 is in threaded connection with a threaded hole on the lower side of the first T-shaped sliding block 23, and the input end of the second motor 210 is electrically connected with the output end of an external power supply through an external control switch group. When the first T-shaped sliding block 23 is controlled to synchronously move, the motor II 210 at the lower end of the left side of the U-shaped base 21 is turned on to drive the screw II 211 to rotate under the limitation of the U-shaped base 21, so that the screw II is in threaded connection with the first T-shaped sliding block 23 to drive the screw II to move along the direction of the sliding rod 22.

Still include clamping unit 4, clamping unit 4 includes T type grip block 41, fixed block three 42, two-way screw 43 and gear 44, a pair of spacing groove has been seted up in the upper end left side of workstation 1, and two spacing inslot sides are equipped with T type grip block 41, the lower extreme of workstation 1 is located the both sides of two spacing grooves and is equipped with a fixed block three 42 respectively, the both ends of two-way screw 43 are connected in the rotation of the relative one end of two fixed blocks three 42, the screw hole of two T type grip block 41 downside of threaded connection respectively in the peripheral both sides of two-way screw 43, the screw thread direction of two sides of two-way screw 43 is opposite, the peripheral middle part of two-way screw 43 is equipped with gear 44. When the cutting operation of die steel is carried out, the die steel is required to be clamped and fixed firstly, the movable position of the bidirectional screw rod 43 is limited by the fixing block III 42, and when the position of the T-shaped clamping block 41 is adjusted, the external transmission device is used for meshing the gear 44, so that the bidirectional screw rod 43 drives the two T-shaped clamping blocks 41 to move along the direction of the limiting groove through the threaded hole, the clamping position can be adjusted according to die steel with different sizes, and the clamping flexibility is improved.

Still include rubber pad 5, the draw-in groove has been seted up to the inner upside of T grip block 41, and the draw-in groove inner wall is equipped with rubber pad 5. The rubber pad 5 provides a certain protection function when the T-shaped clamping block 41 clamps, so that the two sides of the die steel are prevented from being worn.

The workbench further comprises supporting legs 6, one supporting leg 6 is respectively arranged at four corners of the lower end of the workbench 1, and anti-tilting rods are arranged at the lower sides of the opposite ends of the left and right pairs of supporting legs 6. The supporting legs 6 support the integral structure of the workbench 1, and the linear cutting and polishing stability is improved.

The working principle of the die steel wire cutting and polishing integrated device provided by the utility model is as follows: the supporting leg 6 supports the whole structure of the workbench 1, improves the cutting and polishing stability of the die steel wire, then displaces the wire cutting tool 29 to the outermost side, when the die steel is cut, the wire cutting tool is required to be clamped and fixed, the fixing block III 42 limits the movable position of the two-way screw rods 43, when the position of the T-shaped clamping blocks 41 is adjusted, the two-way screw rods 43 drive the two T-shaped clamping blocks 41 to move along the direction of the limiting grooves through the threaded holes by using an external transmission device to engage the gear 44, the clamping positions can be adjusted according to the die steel with different sizes, the clamping flexibility is improved, the rubber pad 5 provides a certain protection function when the T-shaped clamping blocks 41 are clamped, the two sides of the die steel are prevented from being worn, the cutting operation is carried out after the fixing is finished, the U-shaped base 21 fixes the position of the slide rod 22, the first T-shaped slide block 23 can move along the direction of the slide rod 22, and when the die steel is cut, the first motor 25 is opened to drive the first screw rod 27 to rotate under the limit of the first fixed block 26, the connecting block 28 is further connected in a threaded manner, the I-shaped sliding block 24 is controlled to move along the direction of the strip-shaped groove, in order to ensure the synchronism of cutting operation, the first T-shaped sliding block 23 is controlled to move synchronously, the second motor 210 at the lower left end of the U-shaped base 21 is opened to drive the second screw rod 211 to rotate under the limit of the U-shaped base 21, so that the second screw rod 211 is connected with the first T-shaped sliding block 23 in a threaded manner to drive the first screw rod to move along the direction of the sliding rod 22, the wire cutting tool 29 is controlled to move synchronously, the wire cutting tool 29 is used for carrying out pulse current clamping, the workpiece is cut by utilizing the corrosion action of pulse current discharge, after the die steel is cut, the die steel can be properly pressed against the end face of the grinding wheel 33 by using an external pushing device, the second T-shaped sliding block 31 is controlled to move along the direction of the sliding groove by using the electric hydraulic rod 35 on the second fixed block 34, so that the displacement stability is improved, the third motor 32 is started to drive the grinding wheel 33 to rotate at a high speed, so that the cutting surface of the die steel is ground, a finished product is taken down after the grinding is finished to carry out subsequent operation, and the integral die steel wire cutting and grinding device is used.

It should be noted that, the core chip of the control switch set disclosed in the above embodiment is a PLC single chip microcomputer, the specific model is ohm-C200H-IM 212, the first motor 25, the second motor 210 and the third motor 32 can be freely configured according to the actual application scenario, the first motor 25 and the second motor 210 can be servo motors, and the third motor 32 can be single-phase series excitation motors. The control switch sets control the operation of motor one 25, motor two 210 and motor three 32 using methods commonly used in the art.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A mould steel wire cutting and polishing integrated device is characterized in that: comprises a workbench (1), a linear cutting unit (2) and a polishing unit (3);

workbench (1): a polishing unit (3) is arranged at the front side of the upper end of the upper part;

cutting unit (2): the device comprises a U-shaped base (21), a slide bar (22), a first T-shaped slide block (23), an I-shaped slide block (24), a motor I (25), a fixed block I (26), a screw I (27), a connecting block (28), a linear cutting tool (29) and a movable component, wherein a rectangular groove is formed in the center of the upper end of the workbench (1), the left end and the right end of the inner wall of the rectangular groove are respectively and fixedly connected with the lower sides of the two ends of the U-shaped base (21), the slide bar (22) is arranged on the lower side of the opposite end of the U-shaped base (21), the middle part of the periphery of the slide bar (22) is transversely and movably connected with a slide hole on the upper side of the first T-shaped slide block (23), the upper end of the U-shaped base (21) is provided with a strip-shaped groove, the inner wall of the strip-shaped groove is transversely and movably connected with the outer side of the I-shaped sliding block (24), the left side of the upper end of the U-shaped base (21) is provided with a first motor (25), the right side of the upper end of the U-shaped base (21) is provided with a first fixing block (26), the output shaft of the first motor (25) is fixedly connected with one end of a first screw rod (27), the other end of the first screw rod (27) is rotationally connected with the inner end of the first fixing block (26), the upper end of the I-shaped sliding block (24) is provided with a connecting block (28), the middle part of the periphery of the first screw rod (27) is in threaded connection with threaded holes at two ends of the connecting block (28), the opposite ends of the first T-shaped sliding block (23) and the I-shaped sliding block (24) are provided with linear cutting tools (29), and the input end of the motor I (25) is electrically connected with the output end of an external power supply through an external control switch group.

2. The die steel wire cutting and grinding integrated device according to claim 1, wherein: the movable assembly comprises a motor II (210) and a screw II (211), wherein the motor II (210) is arranged at the lower end of the left side of the U-shaped base (21), an output shaft of the motor II (210) is fixedly connected with one end of the screw II (211), the other end of the screw II (211) is rotationally connected with the inner end of the U-shaped base (21), the middle part of the periphery of the screw II (211) is in threaded connection with a threaded hole at the lower side of the first T-shaped sliding block (23), and the input end of the motor II (210) is electrically connected with the output end of an external power supply through an external control switch group.

3. The die steel wire cutting and grinding integrated device according to claim 1, wherein: the utility model discloses a polishing unit, including first T type slider (31), motor (32), grinding wheel (33), fixed block two (34) and electronic hydraulic stem (35), the spout has been seted up on the upper end right side of workstation (1), and the both sides of spout inner wall transverse movable connection second T type slider (31), the one end of fixed connection motor three (32) is passed through to the upper end of second T type slider (31), the one end of grinding wheel (33) is fixedly connected to the output shaft of motor three (32), the lower extreme of workstation (1) is located the left side of spout and is equipped with fixed block two (34), the inner of fixed block two (34) is equipped with electronic hydraulic stem (35), the left end of the inner fixed connection second T type slider (31) of electronic hydraulic stem (35), the input of motor three (32) is connected with the output electricity of external power source through outside control switch group.

4. The die steel wire cutting and grinding integrated device according to claim 1, wherein: still include clamping unit (4), clamping unit (4) include T type grip block (41), fixed block three (42), two-way screw rod (43) and gear (44), a pair of spacing groove has been seted up in the upper end left side of workstation (1), and two spacing inslot sides are equipped with T type grip block (41), the lower extreme of workstation (1) is located the both sides of two spacing grooves and is equipped with a fixed block three (42) respectively, and the both ends of two-way screw rod (43) are connected in the relative one end rotation of two fixed block three (42), the screw hole of two T type grip block (41) downside of threaded connection respectively in the peripheral both sides of two-way screw rod (43), the screw thread direction of two sides of two-way screw rod (43) is opposite, the peripheral middle part of two-way screw rod (43) is equipped with gear (44).

5. The die steel wire cutting and grinding integrated device according to claim 4, wherein: still include rubber pad (5), the draw-in groove has been seted up to the inner upside of T type grip block (41), and draw-in groove inner wall is equipped with rubber pad (5).

6. The die steel wire cutting and grinding integrated device according to claim 1, wherein: the automatic tilting prevention device is characterized by further comprising supporting legs (6), wherein one supporting leg (6) is respectively arranged at four corners of the lower end of the workbench (1), and tilting prevention rods are arranged at the lower sides of the opposite ends of the left and right pairs of supporting legs (6).