CN108015740A - A kind of extension bar parallel type autoset road marking - Google Patents

Abstract

The invention discloses a kind of extension bar parallel type autoset road marking, including workbench, multiple slides that can be moved and be parallel to each other on the table are arranged at intervals with workbench, the clamping device for fixing workpiece is installed on slide；Liner agency is provided with the center of the workbench, liner agency includes the knife rest perpendicular to the slide and above slide, the blade pawl identical with the slide quantity is installed, the blade pawl can be along the axial movement perpendicular or parallel to the slide on knife rest.Apparatus of the present invention, have the advantages that intelligence degree is high, safe and reliable, accuracy is high, efficient, product quality is high, cost is low, time saving and energy saving, the scope of application is wider.

Description

An extension rod parallel type automatic marking device

technical field

The invention relates to the technical field of mechanical processing, in particular to an extension rod parallel automatic marking device.

Background technique

At present, with the advancement of science and technology, most machinery manufacturing plants have basically realized automation or semi-automation in mold processing. As the main supporting part of the hydraulic support, the column is used to bear the load of the roof. The column generally has two types: single telescopic column and double telescopic column, which have the characteristics of high reliability, simple structure, low processing cost, and large expansion ratio. As the main part of the column, the extension rod has strict processing technology requirements; and the scribing is the most important step of the extension rod, and the accuracy of the positioning of the scribing must be guaranteed.

However, most column machinery manufacturers still use manual marking or manual mechanical marking in the marking process of the extension rod. These traditional marking processes have many shortcomings: 1. When the worker is marking the line, the extension rod is on the marking platform. It is not easy to fix firmly on the surface, and phenomena such as rolling and slipping may occur, resulting in inaccurate reference positioning and reduced marking accuracy. Repeated marking is often done, which is time-consuming and labor-intensive, and increases the processing cost of the enterprise. 2. The extension rod is a large rod workpiece with large size and heavy weight. When rolling, slipping and other phenomena occur, production accidents such as crushing and extrusion may occur. 3. When workers mark lines, they can only mark a single piece of extension rod at a time. The marking efficiency is low and the enterprise benefits are reduced. 4. Manual marking or manual mechanical marking has inaccurate reference positioning, resulting in increased marking errors. 5. The degree of intelligence of manual marking or mechanical marking is low. 6. The qualification rate of crossed products is low.

Contents of the invention

The purpose of the present invention is to provide an extension rod parallel type automatic marking device to solve the problems of low precision, low efficiency, low pass rate, poor safety and high cost existing in the existing extension rod marking process.

In order to achieve the above tasks, the present invention adopts the following technical solutions:

An extension bar parallel type automatic marking device, comprising a workbench, on which a plurality of slide rails that can move on the workbench and are parallel to each other are arranged at intervals, and a clamping mechanism for fixing workpieces is installed on the slide rails; The center of the workbench is provided with a scribing mechanism, the scribing mechanism includes a knife rest perpendicular to the slide rail and above the slide rail, the knife rest is equipped with the same number of blade claws as the number of the slide rails, the The blade jaws can move in an axial direction perpendicular to or parallel to the slide rail.

Further, a pair of mounting tables are provided on the workbench, and mounting holes are opened on the mounting table, and a lead screw is set through the mounting hole, and one end of the lead screw is installed on the The servo motor on the workbench is connected; the lead screw between the pair of mounting tables is equipped with a slide block, and the first hydraulic cylinder is installed on the slide block, and the tool rest is installed on the output shaft of the first hydraulic cylinder On, the tool holder is perpendicular to the slide rail.

Further, a pressure sensor is provided between the blade claw and the tool holder.

Further, a position sensor and an encoder are installed at the end of the lead screw.

Further, the blade claw is composed of two arc-shaped blades connected from the middle, and the blade claw is a cross-arc structure.

Further, the clamping mechanism includes a first clamping frame and a second clamping frame, wherein the first clamping frame is fixed at one end of the slide rail, and a positioning plate is arranged on the first clamping frame; the The second clamping frame can move along the axial direction of the slide rail.

Further, the first clamping frame includes symmetrically arranged clamping blocks, an arc-shaped clamping surface is processed from the top of the clamping block to the side of the clamping block, and a plurality of clamping blocks with the same interval are arranged on the bottom of the clamping block. Groove; the positioning plate is located on one side of the clamping surface, and a plurality of clamping blocks matching the clamping grooves are laid on the slide rail at equal intervals along the axial direction of the slide rail.

Further, a second hydraulic cylinder is installed on the end of the workbench, and a push plate that can move up and down is installed on the output shaft of the second hydraulic cylinder; a card is vertically installed on the output shaft of the second hydraulic cylinder. The side of the clamping tube is provided with a strip groove in the axial direction, and there is a sliding shaft inside the clamping tube, which is connected to the moving plate through a connecting plate passing through the strip groove; the bottom of the clamping tube An electric telescopic rod is provided, the axial direction of the electric telescopic rod is parallel to the axial direction of the card tube; the output shaft of the electric telescopic rod is connected with the push plate through a connecting rod.

Further, the first hydraulic cylinder is provided with a first displacement sensor, and the second hydraulic cylinder is provided with a second displacement sensor; the first hydraulic cylinder and the second hydraulic cylinder pass through the first electromagnetic reversing valve and the second hydraulic cylinder respectively. The electromagnetic reversing valve is connected to the hydraulic pump.

Further, the servo motor, the first hydraulic cylinder and the second hydraulic cylinder are all controlled by a PLC controller.

The present invention has the following technical characteristics:

The positioning and scribing device of the present invention can realize accurate scribing positioning, and the scribing error is strictly controlled within the standard range of size tolerance, which overcomes the problem of low accuracy when manually scribing; the movable workpiece clamping mechanism prevents lengthening Rod rolls, slips, etc. during the marking process, and realizes the marking of various products, not limited to extension rods. The position sensor and the displacement sensor are used to determine the scribing datum, realize the positioning and scribing, and solve the error existing in the determination of the scribing datum; adopt the parallel mode combined with the scribing operation method to realize scribing multiple products at one time, improve the marking efficiency and save Processing cost; the whole process adopts automatic control operation, which greatly reduces the probability of accidents caused by irregular work of workers, and has high safety. The device is simple to operate, has a high degree of intelligence, and has low technical requirements for staff. Generally speaking, the device of the present invention has the advantages of safety and reliability, high precision, high efficiency, high product quality, low cost, time-saving and labor-saving, and wide application range.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention:

Fig. 2 is the front view structure schematic diagram of the present invention:

Fig. 3 is the top view structure schematic diagram of the present invention:

Fig. 4 is the right view structural representation of the present invention:

Fig. 5 is a structural schematic diagram of the first clamping frame part;

Fig. 6 is a side view structural schematic diagram of the second hydraulic cylinder and the push plate;

Fig. 7 is a top view structural schematic diagram of the clamping part;

Fig. 8 is a schematic diagram of PLC control functions in an embodiment of the present invention;

The symbols in the figure represent: 1—working table; 2—servo motor; 3—sliding rail; 4—clamping mechanism; 5—positioning plate; 6—workpiece; 7—blade claw; 8—tool holder; 9—position sensor; 10—encoder; 11—screw; 12—second clamping frame; 13—first clamping frame; 14—elastic coupling; 15—nut and washer; 16—contact bearing; 17—pressure sensor; 18 - the first hydraulic cylinder; 19 - the first displacement sensor; 20 - the first electromagnetic reversing valve; 21 - clamp block; 22 - the second electromagnetic reversing valve; 23 - the second hydraulic cylinder; 24 - push plate; 25 - The second displacement sensor, 26—clamping surface, 27—grip, 28—block, 29—pipe, 30—electric telescopic rod, 31—connecting rod, 32—connecting plate, 33—sliding shaft.

Detailed ways

As shown in Figures 1 to 5, the present invention discloses a parallel automatic marking device with extended rods, which includes a workbench 1 on which a plurality of sliding rails that can move on the workbench 1 and are parallel to each other are arranged at intervals 3. A clamping mechanism 4 for fixing the workpiece 6 (extension bar) is installed on the slide rail 3; a scribing mechanism is provided at the center of the workbench 1, and the scribing mechanism is perpendicular to the slide rail 3 and located at The knife rest 8 above the slide rail 3 is equipped with the same number of blade claws 7 as the slide rail 3, and the blade claw 7 can move along the axial direction perpendicular to or parallel to the slide rail 3 .

The workbench 1 in the present invention is optionally a rectangular platform with a flat upper surface; a plurality of bar-shaped slide rails 3 are installed on the platform, and the slide rails 3 can move on the workbench 1; specifically, On the upper surface of the workbench 1, a plurality of parallel adjustment grooves are provided at intervals. Preferably, the spacing of the adjustment grooves is the same, so as to better cooperate with the marking mechanism; the bottom of the slide rail 3 is assembled in the adjustment groove through a sliding block , so that the slide rail 3 can move along the adjustment groove. The slide rail 3 adopts a structural design with an adjustable position, which is to consider the actual industrial process, in order to cooperate with the installation position of the workpiece 6 hoisting mechanism and other factors, it is necessary to determine the installation position of the slide rail 3 according to the actual situation, and when the slide rail 3 position After being determined, the slide rail 3 is fixed on the workbench 1 by bolts.

A clamping mechanism 4 is installed on the slide rail 3 to fix the workpiece 6, as shown in Figures 1, 4 and 5, the clamping mechanism 4 is used to fix the two ends of the workpiece 6, so that the workpiece 6 can be effectively fixed, so that Subsequent dashes. Marking is achieved by a marking mechanism. Specifically, this program installs a marking mechanism in the middle of the workbench 1, that is, at the center of all slide rails 3. The purpose of installing it at the center is to balance the knife rest 8 left and right, so that each Each blade jaw 7 can better contact and mark the workpiece 6. A bar-shaped knife rest 8 is arranged on the marking mechanism, and the knife rest 8 is positioned at all slide rails 3 tops, and the blade claw 7 installed at the bottom of the knife rest 8 is used for marking the workpiece 6 .

In actual use, first adjust and fix the position of the slide rail 3 on the workbench 1, and then adjust and fix the position of the clamping mechanism 4 on the slide rail 3, so that all the clamping mechanisms 4 are aligned with each other, so that The positions of the workpieces 6 placed on the clamping mechanism 4 can also be aligned with each other. Use the hoisting mechanism to place a workpiece 6 in the clamping mechanism 4 on each slide rail 3, and then move the tool rest 8 downward until the blade claw 7 is in contact with the surface of the workpiece 6, and then make the blade claw 7 parallel to the surface of the workpiece 6. Slide rail 3 moves axially, and the surface of workpiece 6 can be marked by blade claw 7 . Since the parallel structure is adopted in this scheme and the workpiece 6 is clamped and fixed, accurate marking positioning can be realized, rolling and slipping of the workpiece 6 can be avoided, and multiple workpieces 6 can be marked at one time, effectively Improve the marking efficiency.

As shown in Fig. 1, Fig. 4 and Fig. 6, described workbench 1 is provided with a pair of installation platform, is provided with installation hole on the installation platform, is provided with lead screw 11 through described installation hole, and installation hole is connected with lead screw. There is a bearing between the rods 11; one end of the lead screw 11 is connected with the servo motor 2 installed on the workbench 1 through an elastic coupling 14 and a contact bearing 16; the lead screw between the pair of mounting tables 11 is equipped with a slide block, the slide block and the lead screw 11 are threaded, and there is a T-shaped block at the bottom of the slide block, which is assembled in the T-shaped groove opened on the workbench 1, so that when the lead screw 11 rotates, the slide block can move along the The axial movement of the lead screw 11 does not rotate itself; the first hydraulic cylinder 18 is installed on the slider, and the tool rest 8 is installed on the output shaft of the first hydraulic cylinder 18, and the tool rest 8 is perpendicular to the slider Rail 3, and the tool rest 8 is parallel to the upper surface of the table 1. The above-mentioned structure is the driving mechanism of the blade claw 7 , which is used to realize the contact between the blade claw 7 and the workpiece 6 and to draw lines on the surface of the workpiece 6 . Specifically, utilize the first hydraulic cylinder 18 to adjust the position of the tool rest 8 in the vertical direction, so that the blade claw 7 contacts the surface of the workpiece 6; utilize the rotation of the lead screw 11 to adjust the position of the slider, and when the slider moves, the The blade jaw 7 is driven to move axially on the surface of the workpiece 6 for scribing. When marking is completed, utilize the first hydraulic oil cylinder 18 to lift the knife rest 8, make the blade claw 7 break away from the surface of the workpiece 6, and then take off the workpiece 6 to get final product. The blade claw 7 is composed of two arc-shaped blades connected from the middle, and the blade claw 7 is a cross-arc structure; optionally, the blade claw 7 is detachably provided with a cross-arc blade that can be painted set. The distance between the centers of adjacent blade claws 7 is the same as the distance between the centers of adjacent slide rails 3 , so that each blade claw 7 can completely correspond to the position of the workpiece 6 on the slide rail 3 below it. A nut and a washer 15 are arranged on the lead screw 11 for adjusting the slider on the lead screw 11 .

As shown in FIG. 4 , a pressure sensor is provided between the blade claw 7 and the tool holder 8 . The effect of pressure sensor 17 is, when knife rest 8 moved downwards, as blade claw 7 and workpiece 6 surface contacts, then pressure sensor 17 can measure pressure signal, can judge blade claw 7 position by this pressure signal and is suitable, then Stop driving the first hydraulic oil cylinder 18, and then drive the servo motor 2, the blade claw 7 can be started to draw a line. Another function of the pressure sensor 17 is to monitor the contact pressure between the blade claw 7 and the surface of the workpiece 6 , so as to adjust the marking depth of the blade claw 7 . The end of the screw 11 is equipped with a position sensor 9 and an encoder 10, wherein the encoder 10 is used to record the rotation speed of the screw 11, and the displacement sensor 13 is used to record the position of the slider. The benchmark realizes positioning and marking, and solves the problem of errors in determining the marking benchmark in the prior art.

As shown in Figures 1 and 5, optionally, the clamping mechanism 4 includes a first clamping frame 13 and a second clamping frame 12, wherein the first clamping frame 13 is fixed on one end of the slide rail 3, and the second clamping frame 13 is fixed on one end of the slide rail 3. A positioning plate 5 is arranged on a clamping frame 13 ; the second clamping frame 12 can move along the axial direction of the slide rail 3 . Taking Fig. 1 as an example, the first clamping frame 13 is at the front end of the slide rail 3, close to the servo motor 2, and the first clamping frame 13 is fixed. The second clamping frame 12 is adjustable in position. By adjusting its position, different distances can be generated between the first clamping frame 13 and the second clamping frame 12 to adapt to the sizes of different workpieces 6 . After the position of the second clamping frame 12 is adjusted, the second clamping frame 12 is fixed on the slide rail 3 by bolts.

Specifically, the first clamping frame 13 includes symmetrically arranged clamping blocks 21, and an arc-shaped clamping surface 26 is processed from the top of the clamping block 21 to the side of the clamping block 21. The clamping surface 26 is commonly used to place and fix the workpiece 6; the workpiece 6 is generally a cylindrical structure, so the clamping surface 26 adopts an arc-shaped structure design, so that it can better adapt to the shape of the workpiece 6, thereby playing an effective role on the workpiece 6. The function of fixing; the bottom of the clamping block 21 is provided with a plurality of slots 27 at the same interval; A plurality of clamping blocks 28 cooperating with the clamping slots 27 are laid at intervals. The spacing between the clamping blocks 28 is the same as the spacing between the clamping slots 27. By inserting the clamping slots 27 on the clamping blocks 21 on different clamping blocks 28, different spacings can be produced between the clamping blocks 21, so that the clamping The holding mechanism 4 can place cylindrical workpieces 6 with different shaft diameters, rectangular workpieces 6 and workpieces 6 of other shapes, so as to realize the diversity of scribing functions. After the clamping block 21 spacing of the first clamping frame 13 is adjusted, fix by bolt, and make the position of the first clamping frame 13 on all slide rails 3 be on the same straight line; The structure of the second clamping frame 12 and The first clamping frame 13 is basically the same, the difference is that there is no positioning plate 5 on the second clamping frame 12, and other structures are the same. After the clamping block 21 spacing of the second clamping frame 12 is adjusted, the second clamping frame 12 can be pushed on the slide rail 3 to adjust the distance between the first clamping frame 13 and the second clamping frame 12. After the position is appropriate Then fix it with bolts.

The effect of described positioning plate 5 is to play the effect of positioning when placing workpiece 6; part on the positioning plate 5, and then put down the other end of the workpiece 6; since all the first clamping frames 13 are on the same straight line, when the end of the workpiece 6 is put down on the positioning plate 5, all the workpieces 6 can be The positions of the ends of the slide rails 3 are the same, so that the positions of the workpieces 6 on all slide rails 3 are the same, making the marking more accurate.

Preferably, in order to facilitate the adjustment of the position of the slide rail 3 and the second clamping frame 12 before their positions are fixed, in this solution, a second hydraulic cylinder 23 is installed at the end of the workbench 1, and the second hydraulic cylinder 23 A push plate 24 that can move up and down is installed on the output shaft; a card tube 29 is vertically installed on the output shaft of the second hydraulic cylinder 23, and the side of the card tube 29 is provided with a strip groove along the axial direction, and the inside of the card tube 29 A sliding shaft 33 is arranged, and the sliding shaft 33 is connected with the described pushing plate 24 through the connecting plate 32 passing through the strip groove; The direction is parallel to the axial direction of the card tube 29; the output shaft of the electric telescopic rod 30 is connected with the push plate 24 through the connecting rod 31. As shown in Fig. 2 and Fig. 6, the horizontal position of the second clamping frame 12 is higher, while the horizontal position of the slide rail 3 is lower, and the described push plate 24 realizes the slide rail 3 and the second clamping frame as required. Adjustment of rack 12 positions. Specifically, when it is necessary to adjust the positions of all slide rails 3 on the workbench 1, the position of the push plate 24 is lowered by extending the electric telescopic rod 30, and then the push plate 24 is pushed by the second hydraulic cylinder 23, and the push plate 24 Gradually contact with the end of the slide rail 3, push the slide rail 3 to a proper position and then fix it. When it is necessary to adjust the position of the second clamping frame 12, the electric telescopic rod 30 is contracted to raise the position of the push plate 24, and then the distance between the second clamping frame 12 and the first clamping frame 13 is adjusted by pushing the second clamping frame 12. This push plate 24 structure makes the position adjustment of the slide rail 3 and the position adjustment of the second clamping frame 12 independent of each other, and also ensures the consistency of different slide rails 3 and the second clamping frame 12 when adjusting their positions.

More specifically, the first hydraulic cylinder 18 is provided with a first displacement sensor 19, and the second hydraulic cylinder 23 is provided with a second displacement sensor 25; the displacement sensor 13 is used to monitor the stroke of the output shaft of the hydraulic cylinder, so that It is electrically controlled; the first hydraulic cylinder 18 and the second hydraulic cylinder 23 are respectively connected to the hydraulic pump through the first electromagnetic reversing valve 20 and the second electromagnetic reversing valve 22, so that through a hydraulic pump and the electromagnetic reversing valve With cooperation, two hydraulic cylinders can be controlled.

This scheme can carry out marking line through automatic control, and described servo motor 2, first hydraulic oil cylinder 18, second hydraulic oil cylinder 23 are all controlled by a PLC controller, and above-mentioned each sensor, encoder 10, electromagnetic commutator Electronic components such as valves and hydraulic pumps are connected to the PLC controller to receive control or provide information.

The control system of this program is shown in Figure 8, and the control system includes a 360V power supply, a soft starter, a servo motor 2, a low-voltage electrical appliance, a PIZZ safety relay, a PLC controller and a touch display panel. The soft starter plays the role of stabilizing the voltage and current and ensuring the smooth operation of the servo motor 2. The PIZZ safety relay can realize the "emergency stop" control function. The touch display panel and the PLC The controllers communicate with each other, the control signal output end of the PLC is connected with the control signal input end of the servo motor 2, the control signal output end of the PLC is connected with the first electromagnetic reversing valve 20, the second electromagnetic reversing valve The input ends of the reversing valve 22 are connected, and the relevant technical parameters of marking are input on the touch display panel, and the output end is controlled by PLC to make the servo motor 2 run so as to drive the lead screw 11 to move to complete the marking operation.

The low-voltage electrical appliances and the PLC controller are used to control the switch, forward rotation and reverse rotation of the servo motor 2, and the telescopic expansion and contraction of the piston rod of the first hydraulic cylinder 18 to achieve vertical up and down reciprocating motion and the second hydraulic cylinder 23. The piston rod expands and contracts to achieve horizontal reciprocating motion. The input switching value (0/1) of the PLC includes a switch SB1 for controlling the servo motor 2, a forward rotation switch SB2, a reverse rotation switch SB3, and an extension switch SB4, a retraction switch, and a retraction switch for the piston rod of the first hydraulic cylinder 18. The switch SB5, the extension switch SB6 of the piston rod of the second hydraulic cylinder 23, the contraction switch SB7, the proximity switch SQ1 and the proximity switch SQ2, the switch SQ2 of the pressure sensor 17 and the coding switch SQ3.

The output signals of the PLC include the switch signal A1 of the servo motor 2, the forward and reverse signals A3 and A4, and the asymptotic, contact and displacement display signals. The PLC and the touch display board communicate with each other to realize the human-computer interaction function. The touch display board can input the switch value and set the parameters. The touch display board can read and display the output of the PLC output module, such as: the state display of the motor 2, the action state of the hydraulic cylinder, and the movement of the marking device displacement.

When it is necessary to position and mark the workpiece 6, first hang the processed workpiece 6 on each of the detachable holding mechanisms fixed on the workbench 1, start the control system, and start it on the touch display panel. The extension switch SB6 of the second hydraulic cylinder 23 makes the workpiece 6 contact the positioning plate 5 under the thrust of the second hydraulic cylinder 23, so that the end of the workpiece 6 is aligned with one end of the clamping mechanism; then start the second hydraulic pressure. The retraction switch SB7 of the oil cylinder 23, the piston rod of the second hydraulic oil cylinder 23 returns to the original position.

Secondly, according to the drawing size requirements of the processed workpiece 6, input the marking parameters to the parameter setting area on the touch display panel, and start the forward rotation button of the servo motor 2, and control the output shaft of the servo motor 2 through the control of PLC and low-voltage electrical appliances The number of rotations, the servo motor 2 drives the lead screw 11 to rotate together through the elastic coupling 14 . The circular motion of the lead screw 11 can be converted into the linear motion of the slider, so that the second hydraulic cylinder 23 installed on the slider makes a corresponding linear motion, and stops when it reaches a preset position. Then, start the contraction switch SB5 of the first hydraulic cylinder 18 and the piston rod on the touch display panel, and the contraction movement of the piston rod of the first hydraulic cylinder 18 drives the knife rest 8 to move vertically downwards. When the pressure sensor 17 touches the workpiece 6, that is, when the pressure sensor 17 receives a force signal, the switching signal of the pressure sensor 17 and the contraction and compression of the piston rod of the first hydraulic cylinder 18 are released through PLC processing and control. The down function of the knife rest 8, then utilizes the servo motor 2 to drive the blade claw 7 to realize the scribing operation on the workpiece 6.

Finally, start the extension switch SB4 of the piston rod of the first hydraulic cylinder 18, and the knife rest 8 returns to the initial position. If the piston rod of the first hydraulic cylinder 18 passes through the first displacement sensor 19 in the extension process, the PLC Read the change switch value of the first displacement sensor 19 and cancel the oil cylinder extension function, and now a marking operation is completed. By repeating the above operations, 6 batches of workpieces can be automatically positioned and marked in parallel.

Claims (8)

1. a kind of extension bar parallel type autoset road marking, including workbench (1), it is characterised in that on the workbench (1) Multiple slides (3) that can be moved and be parallel to each other on workbench (1) are arranged at intervals with, are provided with slide (3) for fixing The clamping device (4) of workpiece (6)；Be provided with liner agency at the center of the workbench (1), liner agency include perpendicular to The slide (3) and the knife rest (8) above the slide (3), are provided with knife rest (8) identical with the slide (3) quantity Blade pawl (7), the blade pawl (7) can be along the axial movements perpendicular or parallel to the slide (3).

2. extension bar parallel type autoset road marking as claimed in claim 1, it is characterised in that on the workbench (1) A pair of of erecting bed is provided with, mounting hole is offered on erecting bed, the mounting hole is provided with leading screw (11), leading screw (11) One end be connected by yielding coupling (14), contact bearing (16) with the servomotor (2) on the workbench (1)；Institute Sliding block is equipped with leading screw (11) between a pair of of the erecting bed stated, the first hydraulic cylinder (18) is installed on sliding block, it is described Knife rest (8) is installed on the output shaft of the first hydraulic cylinder (18), and knife rest (8) is perpendicular to the slide (3).

3. extension bar parallel type autoset road marking as claimed in claim 1, it is characterised in that the blade pawl (7) with Pressure sensor (17) is provided between knife rest (8).

4. extension bar parallel type autoset road marking as claimed in claim 2, it is characterised in that the end of the leading screw (11) End installation position sensor (9) and encoder (10).

5. extension bar parallel type autoset road marking as claimed in claim 1, it is characterised in that the blade pawl (7) by The blade of two arcs is connected and composed from middle part, and blade pawl (7) is right-angled intersection arcuate structure.

6. extension bar parallel type autoset road marking as claimed in claim 1, it is characterised in that the clamping device (4) Including the first holding frame (13) and the second holding frame (12), wherein the first holding frame (13) is fixed on one end of the slide (3), Positioning plate (5) is provided with first holding frame (13)；Second holding frame (12) can be along the axial movement of slide (3).

7. extension bar parallel type autoset road marking as claimed in claim 5, it is characterised in that first holding frame (13) include symmetrically arranged fixture block (21), the folder of arc is machined with from the side surface direction of top surface to the fixture block (21) of fixture block (21) Face (26) is held, the bottom of fixture block (21) is provided with the identical card slot (27) in multiple intervals；The positioning plate (5) is located at clamping face (26) side, is equipped with the slide (3) and multiple coordinates with the card slot (27) at equal intervals along the axial direction of slide (3) Fixture block (28).

8. extension bar parallel type autoset road marking as claimed in claim 1, it is characterised in that the workbench (1) End is provided with the second hydraulic cylinder (23), and passage plate moving up and down is provided with the output shaft of the second hydraulic cylinder (23) (24)；Card pipe (29) is vertically installed with the output shaft of second hydraulic cylinder (23), the side of card pipe (29) is vertically Offer bar-shaped trough, there is slide-bar (33) inside card pipe (29), slide-bar (33) by the connecting plate (32) through the bar-shaped trough with Passage plate (24) connection；The bottom of the card pipe (29) is provided with electric telescopic rod (30), electric telescopic rod (30) Axial direction and card pipe (29) it is axially in parallel；The output shaft of the electric telescopic rod (30) passes through connecting rod (31) and the passage Plate (24) connects.