CN113319925A - Hydraulic punching device for plastic plate - Google Patents

Abstract

The invention relates to a hydraulic punching device for a plastic plate, which comprises a bracket, a punching mechanism and a clamping mechanism, wherein the punching mechanism and the clamping mechanism are arranged on the bracket, the clamping mechanism comprises a rotating component, a clamping component and a pushing component, the clamping component comprises a clamping unit and a limiting unit, the punching mechanism comprises a hydraulic cylinder and a drill bit, a positioning component is arranged on a limiting block, the hydraulic punching device for the plastic plate realizes the clamping of a workpiece through the clamping mechanism, the punching is realized through the punching mechanism, the device realizes the operation of the punching mechanism and the clamping mechanism through one output end, the energy is saved, meanwhile, the punching mechanism and the clamping mechanism adopt linkage, the online clamping of the workpiece is realized, the efficiency is improved, meanwhile, the linkage adopts a pure mechanical structure, the stability and the service life of the device are improved, the clamping mechanism adopts flexible clamping, the rigid clamping and scratching of the workpiece are avoided, and the workpiece is protected.

Description

Hydraulic punching device for plastic plate

Technical Field

The invention relates to a hydraulic punching device for a plastic plate.

Background

The hydraulic mechanical equipment device is a carrier of a hydraulic system, a complete hydraulic system consists of five parts, namely a power element, an executive component, a control component, an auxiliary component and hydraulic oil, the hydraulic equipment is a combination of the parts, and an executive component hydraulic cylinder and a hydraulic motor of the hydraulic system are used for converting pressure energy of the liquid into mechanical energy so as to obtain required linear reciprocating motion or rotary motion. The hydraulic device can modify elements at will according to the action to be designed to achieve the work to be finished, is easy to transmit and configure due to large transmission force, and is widely applied to industrial and civil industries.

Hydraulic equipment is often used for punching device's driving source, current hydraulic pressure punching device is when using, generally adopt the rigidity centre gripping, and when punching a hole to the plastic slab, because plastics have easy deformability, the rigidity centre gripping causes the plastic slab to take place deformation easily, damage even, also draw the colored work piece easily simultaneously, it is pleasing to the eye to influence, and current hydraulic pressure punching device is when using, need carry out the centre gripping to the work piece earlier, then punch, efficiency is not high, simultaneously to fixture and the automatic operation of mechanism of punching a hole, generally adopt this kind of electronic component of sensor, this kind of electronic component stability is not enough, and service life is not high.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, a hydraulic punching device for a plastic plate is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: a hydraulic punching device for a plastic plate comprises a support, a punching mechanism and a clamping mechanism, wherein the punching mechanism and the clamping mechanism are arranged on the support;

the clamping mechanism comprises a rotating assembly, a clamping assembly and a pushing assembly, the rotating assembly comprises a moving rod, a limiting rod, a rack, a gear and a rotating shaft, the limiting rod is arranged on the support, the moving rod is sleeved on the limiting rod, the moving rod is in sliding connection with the limiting rod, one end, away from the limiting rod, of the moving rod is arranged on the punching mechanism, the rack is arranged on the moving rod, the rotating shaft is arranged on the support, the gear is sleeved on the rotating shaft, the gear is in key connection with the rotating shaft, the gear is meshed with the rack, the clamping assembly comprises a clamping unit and a limiting unit, the clamping unit comprises a fixed rod, a pressure rod and a clamping block, the fixed rod is arranged on the support, a chute is arranged on the fixed rod, the pressure rod penetrates through the chute, the pressure rod is in sliding connection with the chute, and the clamping block is arranged at one end of the pressure rod, the limiting unit comprises a limiting block and a first spring, the limiting block is arranged in a sliding groove and is in sliding connection with the sliding groove, the limiting block abuts against a pressure rod, the first spring is arranged in the sliding groove, one end of the first spring is connected with the sliding groove, the other end of the first spring is connected with the limiting block, the pushing assembly comprises an eccentric wheel, a push rod and push blocks, the eccentric wheel is sleeved on a rotating shaft and is in key connection with the rotating shaft, the push rod is arranged on the rotating shaft, one end of the push rod is connected with the rotating shaft, the number of the push blocks is two, the two push blocks are arranged on the pressure rod, and the push rod abuts against one of the push blocks;

the punching press mechanism includes cylinder and drill bit, the vertical setting down of gas pole is on the support, the drill bit is installed on the cylinder, the one end that the gag lever post was kept away from to the carriage release lever is connected with the gas pole of cylinder.

For carrying out better spacing to the removal of depression bar, be equipped with locating component on the stopper, locating component includes two positioning unit, and two positioning unit set up the both sides at the stopper respectively, positioning unit includes locating lever and locating piece, the locating lever sets up on the stopper, be equipped with the spacing groove on the depression bar, the locating lever is located the spacing inslot, locating lever and spacing groove sliding connection, the locating piece sets up the one end that is located the spacing inslot at the locating lever, the spacing inslot is equipped with the constant head tank, the locating piece is located the constant head tank, locating piece and constant head tank sliding connection.

In order to support the device, the support includes base, branch, horizontal pole and places the platform, branch sets up the one end at the base, the horizontal pole passes through branch setting in the base top, place the platform and be located the drill bit under, it is equipped with the round hole to place the bench, the round hole sets up with the drill bit is coaxial, the cylinder sets up on the horizontal pole.

In order to better limit the movement of the pressure rod, the number of the positioning assemblies is two, and the two positioning assemblies are respectively arranged at two ends of the limiting block.

In order to better limit the movement of the pressure rod, the number of the positioning blocks is two, the two positioning blocks are respectively arranged on two sides of the positioning rod, the number of the positioning grooves is two, and the two positioning blocks are respectively positioned in the two positioning grooves.

In order to reduce friction, a pulley is arranged on the positioning block and is in rolling connection with the positioning groove.

For carrying out better spacing to the removal of stopper, be equipped with the slider on the stopper, be equipped with the bar groove in the spout, the slider is located the bar inslot, slider and bar groove sliding connection.

For carrying out better spacing to the removal of stopper, the slider has two, and two sliders set up respectively in the both sides of stopper, the bar groove has two, and two sliders are located two bar inslots respectively.

The hydraulic punching device for the plastic plate has the advantages that the clamping of the workpiece is realized through the clamping mechanism, the punching is realized through the punching mechanism, compared with the existing hydraulic punching device, the operation of the punching mechanism and the clamping mechanism is realized through one output end, the energy is saved, meanwhile, the online clamping of the workpiece is realized by adopting the linkage of the punching mechanism and the clamping mechanism, the efficiency is improved, meanwhile, the linkage adopts a pure mechanical structure, the stability and the service life of the device are improved, compared with the existing clamping mechanism, the mechanism adopts flexible clamping, the rigid clamping and the scratching of the workpiece are avoided, and the workpiece is protected.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a hydraulic punching apparatus for plastic panels according to the present invention;

FIG. 2 is a schematic structural view of a rotating assembly of the hydraulic punching apparatus for plastic panels of the present invention;

FIG. 3 is a schematic view illustrating a connection structure of a pushing assembly and a clamping assembly of the hydraulic punching apparatus for plastic plates according to the present invention;

FIG. 4 is a schematic view showing the structure of a positioning unit of the hydraulic punching apparatus for plastic plates according to the present invention;

in the figure: 1. the device comprises a movable rod, 2 parts of a limiting rod, 3 parts of a rack, 4 parts of a gear, 5 parts of a rotating shaft, 6 parts of a fixed rod, 7 parts of a pressure rod, 8 parts of a clamping block, 9 parts of a limiting block, 10 parts of a spring, 11 parts of an eccentric wheel, 12 parts of a push rod, 13 parts of a push block, 14 parts of a hydraulic cylinder, 15 parts of a drill bit, 16 parts of a positioning rod, 17 parts of a positioning block, 18 parts of a base, 19 parts of a supporting rod, 20 parts of a cross rod, 21 parts of a placing table, 22 parts of a pulley and 23 parts of a sliding block.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1, a hydraulic punching device for a plastic plate comprises a bracket, a punching mechanism and a clamping mechanism, wherein the punching mechanism and the clamping mechanism are both arranged on the bracket;

when the device is used, the workpiece is punched through the punching mechanism, and the workpiece is clamped through the clamping mechanism.

As shown in fig. 2-3, the clamping mechanism includes a rotating assembly, a clamping assembly and a pushing assembly, the rotating assembly includes a moving rod 1, a limiting rod 2, a rack 3, a gear 4 and a rotating shaft 5, the limiting rod 2 is disposed on the bracket, the moving rod 1 is sleeved on the limiting rod 2, the moving rod 1 is slidably connected with the limiting rod 2, one end of the moving rod 1 away from the limiting rod 2 is disposed on the punching mechanism, the rack 3 is disposed on the moving rod 1, the rotating shaft 5 is disposed on the bracket, the gear 4 is sleeved on the rotating shaft 5, the gear 4 is in key connection with the rotating shaft 5, the gear 4 is engaged with the rack 3, the clamping assembly includes a clamping unit and a limiting unit, the clamping unit includes a fixing rod 6, a pressing rod 7 and a clamping block 8, the fixing rod 6 is disposed on the bracket, the fixing rod 6 is provided with a sliding groove, the pressing rod 7 penetrates through the sliding groove, the pressing rod 7 is connected with the sliding groove in a sliding mode, the clamping block 8 is arranged at one end of the pressing rod 7, the limiting unit comprises a limiting block 9 and a spring 10, the limiting block 9 is arranged in the sliding groove, the limiting block 9 is connected with the sliding groove in a sliding mode, the limiting block 9 abuts against the pressing rod 7, the spring 10 is arranged in the sliding groove, one end of the spring 10 is connected with the sliding groove, the other end of the spring 10 is connected with the limiting block 9, the pushing assembly comprises an eccentric wheel 11, a push rod 12 and push blocks 13, the eccentric wheel 11 is sleeved on the rotating shaft 5, the eccentric wheel 11 is in key connection with the rotating shaft 5, the push rod 12 is arranged on the rotating shaft 5, one end of the push rod 12 is connected with the rotating shaft 5, the push blocks 13 are provided with two, the two push blocks 13 are arranged on;

here, the spring 10 is in a compressed state, the restoring force of the spring 10 generates a downward thrust to the limit block 9, the limit block 9 generates a downward thrust to the press rod 7, so that the press rod 7 always abuts against the eccentric wheel 11, the punching mechanism drives the moving rod 1 to move along with the operation of the punching mechanism, the moving rod 1 drives the rack 3 to move, the rack 3 drives the gear 4 to rotate, the gear 4 drives the rotating shaft 5 to rotate, the rotating shaft 5 drives the eccentric wheel 11 to rotate, when the convex surface of the eccentric wheel 11 abuts against the press rod 7, the eccentric wheel 11 drives the press rod 7 to move upwards, the press rod 7 drives the clamping block 8 to move upwards, so that enough space is left between the clamping block 8 and the workpiece, meanwhile, the rotating shaft 5 drives the push rod 12 to rotate, when the push rod 12 abuts against the push block 13 close to the fixed rod 6, the push rod 12 drives the push rod 13 to move towards the fixed rod 6, and the push rod 13 drives the press rod 7 to move, the pressing rod 7 drives the clamping block 8 to move, so that the clamping block 8 moves to the position above a workpiece, when the convex surface of the eccentric wheel 11 is not abutted to the pressing rod 7, the pressing rod 7 is not blocked, the spring 10 drives the limiting block 9 to move downwards under the action of restoring force of the spring 10, the limiting block 9 drives the pressing rod 7 to move downwards, so that the clamping block 8 moves downwards and compresses the workpiece, so that the workpiece is clamped, after punching is completed, the punching mechanism drives the moving rod 1 to move reversely, the moving rod 1 drives the rack 3 to move reversely, the rack 3 drives the gear 4 to rotate reversely, the gear 4 drives the rotating shaft 5 to rotate reversely, so that the eccentric wheel 11 rotates reversely, so that the convex surface of the eccentric wheel 11 is abutted to the pressing rod 7 again, the convex surface of the eccentric wheel 11 pushes the pressing rod 7 to move upwards again, so that the pressing rod 7 moves upwards, so that the clamping block 8 moves upwards, thereby releasing the clamping state of the workpiece, simultaneously, the rotating shaft 5 drives the push rod 12 to rotate reversely, the push rod 12 pushes the push block 13 close to the fixed rod 6 to move away, so that when the push rod 12 rotates reversely, the push rod 12 does not abut against the push block 13, the push block 13 moves, the driving pressure rod 7 moves, another push block 13 on the pressure rod 7 moves towards the fixed rod 6, so that when the push rod 12 rotates reversely, the push rod 12 can push the push block 13 far away from the fixed rod 6 to move reversely, the push block 13 drives the pressure rod 7 to move reversely, the pressure rod 7 drives the clamping block 8 to move reversely, so that the clamping block 8 moves away from the upper part of the workpiece, namely, the clamping state of the workpiece is released, namely, the workpiece can be taken down, here, the stamping mechanism runs once, so that the moving rod 1 moves a certain distance, the moving rod 1 drives the rack 3 to move a certain distance, the rack 3 moves a distance, and the driving gear 4 just rotates for one circle, so that after one-time punching, the eccentric wheel 11 and the push rod 12 rotate forwards for one circle and then rotate reversely for one circle, so that the clamping block 8 is lifted to move onto the workpiece, then the workpiece is clamped by putting down, then the workpiece is lifted to move away in the reverse direction, and then the workpiece is put down to return to the initial position.

Here, the workpiece is pressed by the restoring force of the spring 10, and flexible clamping is adopted for the workpiece, so that the workpiece is prevented from being scratched by rigid clamping, and even the workpiece is prevented from being deformed and damaged.

As shown in fig. 1, the punching mechanism includes a hydraulic cylinder 14 and a drill bit 15, the air rod is vertically arranged on the bracket downward, the drill bit 15 is installed on the hydraulic cylinder 14, and one end of the moving rod 1, which is far away from the limiting rod 2, is connected with the air rod of the hydraulic cylinder 14.

The hydraulic cylinder 14 is operated, the hydraulic rod 7 of the hydraulic cylinder 14 extends out, so that the hydraulic rod 7 drives the drill bit 15 to move, the drill bit 15 is made to drill into a workpiece, punching is achieved, meanwhile, the hydraulic rod 7 drives the movable rod 1 to move, so that the clamping mechanism operates and clamps the workpiece, after punching is finished, the hydraulic cylinder 14 is operated again, the hydraulic rod 7 reversely moves, so that the drill bit 15 moves out of the workpiece, meanwhile, the hydraulic rod 7 drives the movable rod 1 to reversely move, and therefore the clamping mechanism is enabled to release the clamping state of the workpiece.

As shown in fig. 4, in order to better limit the movement of the pressing rod 7, a positioning assembly is arranged on the limiting block 9, the positioning assembly comprises two positioning units, the two positioning units are respectively arranged on two sides of the limiting block 9, each positioning unit comprises a positioning rod 16 and a positioning block 17, the positioning rod 16 is arranged on the limiting block 9, a limiting groove is formed in the pressing rod 7, the positioning rod 16 is located in the limiting groove, the positioning rod 16 is slidably connected with the limiting groove, the positioning block 17 is arranged at one end of the positioning rod 16 located in the limiting groove, a positioning groove is formed in the limiting groove, the positioning block 17 is located in the positioning groove, and the positioning block 17 is slidably connected with the positioning groove.

Here, the positioning rod 16 is located in the limiting groove, so that the positioning rod 16 can only move along the axis direction of the limiting groove, the movement of the pressing rod 7 is limited, the positioning rod 16 moves to drive the positioning block 17 to move, the positioning block 17 is located in the positioning groove, so that the positioning block 17 can only move along the axis direction of the positioning groove, and the movement of the pressing rod 7 is better limited.

In order to support the device, the support comprises a base 18, a support rod 19, a cross rod 20 and a placing table 21, wherein the support rod 19 is arranged at one end of the base 18, the cross rod 20 is arranged above the base 18 through the support rod 19, the placing table 21 is arranged above the base 18, the placing table 21 is located under the drill bit 15, a round hole is formed in the placing table 21 and is coaxial with the drill bit 15, and the hydraulic cylinder 14 is arranged on the cross rod 20.

In order to better limit the movement of the compression bar 7, the number of the positioning assemblies is two, and the two positioning assemblies are respectively arranged at two ends of the limit block 9.

In order to better limit the movement of the pressure rod 7, the number of the positioning blocks 17 is two, the two positioning blocks 17 are respectively arranged on two sides of the positioning rod 16, the number of the positioning grooves is two, and the two positioning blocks 17 are respectively positioned in the two positioning grooves.

In order to reduce friction, a pulley 22 is arranged on the positioning block 17, and the pulley 22 is in rolling connection with the positioning groove.

For carrying out better spacing to stopper 9's removal, be equipped with slider 23 on stopper 9, be equipped with the bar groove in the spout, slider 23 is located the bar inslot, slider 23 and bar groove sliding connection.

In order to carry out better spacing to stopper 9's removal, slider 23 has two, and two sliders 23 set up respectively in stopper 9's both sides, the bar groove has two, and two sliders 23 are located two bar inslot respectively.

When the device is used, a workpiece is placed on a placing table 21, a hydraulic cylinder 14 is operated, a hydraulic rod 7 of the hydraulic cylinder 14 extends out, so that the hydraulic rod 7 drives a drill bit 15 to move, so that the drill bit 15 drills into the workpiece to realize punching, a spring 10 is in a compression state, restoring force of the spring 10 generates downward thrust on a limiting block 9, the limiting block 9 generates downward thrust on a compression rod 7, so that the compression rod 7 always abuts against an eccentric wheel 11, when the hydraulic rod 7 moves, a moving rod 1 is driven to move, the moving rod 1 drives a rack 3 to move, the rack 3 drives a gear 4 to rotate, the gear 4 drives a rotating shaft 5 to rotate, the rotating shaft 5 drives the eccentric wheel 11 to rotate, when a convex surface of the eccentric wheel 11 abuts against the compression rod 7, the eccentric wheel 11 drives the compression rod 7 to move upwards, the compression rod 7 drives a clamping block 8 to move upwards, so that a sufficient space is reserved between the clamping block 8 and the workpiece, meanwhile, the rotating shaft 5 drives the push rod 12 to rotate, when the push rod 12 abuts against a push block 13 close to the fixed rod 6, the push rod 12 drives the push block 13 to move towards the direction of the fixed rod 6, the push block 13 drives the press rod 7 to move, the press rod 7 drives the clamping block 8 to move, so that the clamping block 8 moves to the upper side of the workpiece, when the convex surface of the eccentric wheel 11 does not abut against the press rod 7, the press rod 7 is not blocked, under the action of the restoring force of the spring 10, the spring 10 drives the limiting block 9 to move downwards, the limiting block 9 drives the press rod 7 to move downwards, so that the clamping block 8 moves downwards to compress the workpiece, so that the workpiece is clamped, the workpiece is prevented from deviating during punching, a good punching effect is achieved, the workpiece is compressed through the restoring force of the spring 10, flexible clamping is adopted for the workpiece, and the workpiece is prevented from being scratched by rigid clamping, even deformed and damaged, protecting the workpiece, after punching, operating the hydraulic cylinder 14 again to enable the hydraulic rod 7 to move reversely, so that the drill bit 15 moves out of the workpiece, meanwhile, the hydraulic rod 7 drives the movable rod 1 to move reversely, the movable rod 1 drives the rack 3 to move reversely, the rack 3 drives the gear 4 to rotate reversely, the gear 4 drives the rotating shaft 5 to rotate reversely, so that the eccentric wheel 11 rotates reversely, so that the convex surface of the eccentric wheel 11 abuts against the pressure rod 7 again, the convex surface of the eccentric wheel 11 pushes the pressure rod 7 to move upwards again, so that the pressure rod 7 moves upwards, so that the clamping block 8 moves upwards, so that the clamping state of the workpiece is released, meanwhile, the rotating shaft 5 drives the push rod 12 to rotate reversely, here, the push rod 12 pushes the push block 13 close to the fixed rod 6 to move away, so that when the push rod 12 rotates reversely, the push rod 12 does not abut against the push block 13, and the push block 13 moves, the driving pressure lever 7 moves, so that the other pushing block 13 on the pressure lever 7 moves towards the fixed rod 6, so that when the push rod 12 rotates reversely, the push rod 12 can push the push block 13 far away from the fixed rod 6 to move reversely, the push block 13 drives the press rod 7 to move reversely, the press rod 7 drives the clamping block 8 to move reversely, so that the clamping block 8 is moved away from the upper part of the workpiece, namely, the clamping state of the workpiece is released, the workpiece can be taken down, the punching mechanism runs once, so that the moving rod 1 moves for a certain distance, the moving rod 1 drives the rack 3 to move for a certain distance, the moving distance of the rack 3 just drives the gear 4 to rotate for one circle, therefore, after one punching, the eccentric wheel 11 and the push rod 12 rotate for one circle in the forward direction, and then reversely rotated for one circle, so that the clamping block 8 is lifted to move to the workpiece, then is put down to clamp the workpiece, is lifted to move away from the workpiece reversely, and is put down to return to the initial position.

Compared with the prior art, this a hydraulic pressure punching device for plastic slab, it is tight to realize the clamp of work piece through fixture, realize punching a hole through the mechanism of punching a hole, compare with current hydraulic pressure punching device, the device has realized the operation of mechanism and fixture of punching a hole through an output, the energy has been saved, the mechanism and fixture of punching a hole simultaneously adopt the linkage, the online clamp of work piece has been realized, the efficiency is improved, this linkage adopts pure mechanical structure simultaneously, the stability and the life of device have been improved, compare with current fixture, this mechanism adopts flexible centre gripping, avoid rigidity centre gripping to draw the flower work piece, realize the protection to the work piece.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. The hydraulic punching device for the plastic plate is characterized by comprising a support, a punching mechanism and a clamping mechanism, wherein the punching mechanism and the clamping mechanism are arranged on the support;

fixture includes runner assembly, centre gripping subassembly and promotion subassembly, the runner assembly includes carriage release lever (1), gag lever post (2), rack (3), gear (4) and pivot (5), gag lever post (2) set up on the support, carriage release lever (1) cover is established on gag lever post (2), carriage release lever (1) and gag lever post (2) sliding connection, the one end setting that gag lever post (2) were kept away from in carriage release lever (1) is on stamping mechanism, rack (3) set up on carriage release lever (1), pivot (5) set up on the support, gear (4) cover is established on pivot (5), gear (4) and pivot (5) key-type connection, gear (4) and rack (3) meshing, the centre gripping subassembly includes centre gripping unit and spacing unit, the centre gripping unit includes dead lever (6), Depression bar (7) and clamp splice (8), dead lever (6) set up on the support, be equipped with the spout on dead lever (6), depression bar (7) pass the spout, depression bar (7) and spout sliding connection, clamp splice (8) set up the one end at depression bar (7), spacing unit includes stopper (9) and spring (10), stopper (9) set up in the spout, stopper (9) and spout sliding connection, stopper (9) support with depression bar (7) and lean on, spring (10) set up in the spout, the one end and the spout of spring (10) are connected, the other end and the stopper (9) of spring (10) are connected, the promotion subassembly includes eccentric wheel (11), push rod (12) and ejector pad (13), eccentric wheel (11) cover is established on pivot (5), eccentric wheel (11) and pivot (5) key-type connection, the push rods (12) are arranged on the rotating shaft (5), one end of each push rod (12) is connected with the rotating shaft (5), two push blocks (13) are arranged, the two push blocks (13) are arranged on the pressure lever (7), and the push rod (12) is abutted against one of the push blocks (13);

the punching press mechanism includes pneumatic cylinder (14) and drill bit (15), the vertical setting down of gas pole is on the support, drill bit (15) are installed on pneumatic cylinder (14), the one end that gag lever post (2) were kept away from in carriage release lever (1) is connected with the gas pole of pneumatic cylinder (14).

2. The hydraulic punching device for the plastic plate according to claim 1, wherein a positioning assembly is arranged on the limiting block (9), the positioning assembly comprises two positioning units, the two positioning units are respectively arranged on two sides of the limiting block (9), the positioning units comprise a positioning rod (16) and a positioning block (17), the positioning rod (16) is arranged on the limiting block (9), a limiting groove is arranged on the pressing rod (7), the positioning rod (16) is arranged in the limiting groove, the positioning rod (16) is slidably connected with the limiting groove, the positioning block (17) is arranged at one end of the positioning rod (16) in the limiting groove, a positioning groove is arranged in the limiting groove, the positioning block (17) is arranged in the positioning groove, and the positioning block (17) is slidably connected with the positioning groove.

3. The hydraulic punching device for plastic boards according to claim 1, wherein the bracket comprises a base (18), a support rod (19), a cross rod (20) and a placing table (21), the support rod (19) is arranged at one end of the base (18), the cross rod (20) is arranged above the base (18) through the support rod (19), the placing table (21) is arranged above the base (18), the placing table (21) is positioned right below the drill bit (15), the placing table (21) is provided with a circular hole which is arranged coaxially with the drill bit (15), and the hydraulic cylinder (14) is arranged on the cross rod (20).

4. The hydraulic punching device for plastic plates according to claim 2, wherein there are two positioning assemblies, and the two positioning assemblies are respectively arranged at both ends of the limiting block (9).

5. A hydraulic punching device for plastic boards according to claim 4, characterized in that there are two positioning blocks (17), two positioning blocks (17) being arranged on each side of a positioning rod (16), two positioning slots being arranged, two positioning blocks (17) being arranged in two positioning slots.

6. A hydraulic punching device for plastic boards according to claim 5, characterized in that the positioning block (17) is provided with a pulley (22), and the pulley (22) is in rolling connection with the positioning groove.

7. The hydraulic punching device for plastic plates according to claim 2, characterized in that the limiting block (9) is provided with a sliding block (23), the sliding groove is internally provided with a strip-shaped groove, the sliding block (23) is positioned in the strip-shaped groove, and the sliding block (23) is connected with the strip-shaped groove in a sliding manner.

8. The hydraulic punching device for plastic plates according to claim 7, wherein there are two sliding blocks (23), the two sliding blocks (23) are respectively arranged on both sides of the limiting block (9), there are two strip-shaped grooves, and the two sliding blocks (23) are respectively positioned in the two strip-shaped grooves.

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