CN113458296B

CN113458296B - Machine for alternately connecting double cone springs into spring bed net

Info

Publication number: CN113458296B
Application number: CN202110818594.7A
Authority: CN
Inventors: 陈红杰
Original assignee: Shaoxing Stann Machine Co ltd
Current assignee: Shaoxing Stann Machine Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2023-07-04
Anticipated expiration: 2041-07-20
Also published as: CN113458296A

Abstract

The invention discloses a machine for alternately connecting double cone springs into a spring bed net, which comprises a frame, wherein one side of the frame is provided with a steel wire conveying machine head device for continuously inputting a steel wire coiled into a coil spring into the frame along the horizontal direction, and the frame is sequentially provided with an independent driving alternate spring pushing device, a combined driving clamping and supporting device and a withdrawing device along the trend of the spring. According to the invention, the alternate spring pushing device is arranged to push each row of springs input by the externally arranged mechanical arm inwards to the clamping support device at equal time intervals for clamping and fixing, the two adjacent rows of springs which are clamped and fixed serve as the serial units, the serial connection is realized through the transversely input coil springs, the withdrawing device pushes the whole spring bed net after the serial connection out of the rack rapidly, automatic and efficient production of the spring bed net is realized, and the improved design is carried out for each production device matched with the machine, so that a series of problems in the automatic and rapid production process of the spring bed net are overcome, and the production efficiency of the machine is higher.

Description

Machine for alternately connecting double cone springs into spring bed net

Technical Field

The invention relates to the technical field of spring stringing machine equipment, in particular to a machine for alternately connecting double-cone springs into a spring bed net.

Background

At present, most of the domestic serial spring machines are manual spring machines, the efficiency of the manual spring machines in the production process is low, the quality and appearance size standard reaching rate of the produced products are low, and the number of the spring bed nets produced manually for 8 hours a day is basically 1/5-1/4 of the production capacity of an automatic machine. The manual machine is characterized in that the single motor is used for outputting a string spring wire string net by means of a manual operation machine, the string spring wire is required to be cut off by means of manual closing, the stability is poor, the precision of the produced spring cannot be well controlled, and the production efficiency is low.

In order to solve the problems, the proposal is generated.

Disclosure of Invention

(one) solving the technical problems

In order to overcome the defects in the prior art, the invention provides a machine for alternately connecting double cone springs into a spring bed net, and solves the problems in the prior art.

(II) technical scheme

In order to achieve the above purpose, the invention is realized by the following technical scheme: the machine for alternately connecting the double-cone springs into the spring bed net comprises a frame, wherein a steel wire conveying machine head device is arranged on one side of the frame and used for continuously inputting a steel wire coiled into a coil spring into the frame along the horizontal direction, an independent driving alternate spring pushing device, a combined driving clamping supporting device and a withdrawing device are sequentially arranged on the frame along the trend of the springs, wherein each row of springs input by an external manipulator are pushed inwards to the clamping supporting device to be clamped and fixed at equal time intervals by the alternate spring pushing device, the two adjacent rows of springs which are clamped and fixed are used as serial units to realize stringing through the transversely input coil spring, and the withdrawing device pushes the whole spring bed net after stringing out of the frame rapidly.

Preferably, the steel wire conveyor head device comprises a supporting seat arranged at one side of the frame, and the supporting seat is provided with

The continuous conduction parts and the spiral seat heads are sequentially arranged along the penetrating direction of the steel wire; the continuous conduction component comprises a first rolling wheel serving as a driving station and a second rolling wheel serving as a driven station, annular grooves are formed in the first rolling wheel and the second rolling wheel, annular groove gaps of the first rolling wheel and the second rolling wheel correspondingly form steel wire perforation holes, large gears are coaxially connected to the lower sides of the first rolling wheel and the second rolling wheel, the two large gears are meshed with each other, a first motor is arranged at the lower side of the first rolling wheel of the driving station, and an output end of the first motor is coaxially connected with the first rolling wheel;

the spiral seat head comprises a fixed block provided with a horizontal channel, and the fixed block is fixedly connected with the fixed block through a limiting block

On the supporting seat, a hollow spiral block is connected to the inner side of the fixed block, and a spiral channel is formed in the spiral block.

Preferably, the device also comprises a detection part, wherein the detection part comprises a displacement sensor arranged on the supporting seat and a limiting wheel pivoted on the supporting seat, and the limiting wheels are provided with two and are attached to the steel wire; one of the limiting wheels is coaxially connected with a pinion, and the pinion and the displacement sensor are arranged on the back surface of the limiting wheel.

Preferably, the alternate spring pushing device comprises a first driving component arranged on the frame, the output end of the first driving component is connected with a linkage component, the front side of the frame is connected with a bracket, the bracket is connected with a pushing piece in a sliding way, and the linkage component is connected with the pushing piece and drives the pushing piece to reciprocate along the direction of a sliding groove formed in the bracket;

the first driving part comprises a second motor, the second motor is positioned at the bottom of the rear side of the frame, the output end of the second motor is connected with a rotary table, a connecting rod is hinged on the rotary table, the other end of the connecting rod is hinged with a vertically arranged reciprocating rotating rod, and the top of the reciprocating rotating rod is fixedly connected with a reciprocating frame; wherein the middle part of the reciprocating rotating rod is pivoted with a shaft core rod;

the device also comprises a supporting seat, wherein the supporting seat is arranged at two sides of the frame, two ends of the axle center rod are connected with the supporting seat through bearings, sleeve seats are arranged at two sides of the axle center rod, the upper side of each sleeve seat is connected with a swing rod, and the inner side of each swing rod is hinged with the reciprocating frame;

the linkage part comprises a primary transmission rod and a secondary transmission rod, wherein the primary transmission rod is hinged with the upper end of the swing rod, the primary transmission rod is connected with the secondary transmission rod through a linkage plate and is connected with each other in a hinged mode, and the other end of the secondary transmission rod is hinged with the pushing piece;

The pushing piece comprises a movable frame and a pushing block, wherein the movable frame is a strip plate with two raised ends and a middle part arranged in the bracket, the raised parts of the two ends are positioned at the outer side of the bracket and are hinged with the secondary transmission rod, a sliding groove is obliquely formed in the bracket, and the plate moves back and forth along the sliding groove direction; the pushing blocks are arranged on the plate at equal intervals.

Preferably, the turntable is provided with a plurality of hinge holes for converting hinge points at one end of the connecting rod.

Preferably, the clamping and supporting device comprises a shell arranged on the rack and a second driving component, wherein a cam is arranged in the shell, is in a shoe-shaped gold ingot and is sleeved on a hexagonal screw rod arranged on the second driving component, and the second driving component drives the hexagonal screw rod to drive the cam to rotate;

the upper side of the shell is provided with a push block which is used for pushing the spring into the fixed clamp, and the push block forms upward tilting edges close to the two sides of the fixed clamp so as to resist the bottom ring of the positioning spring;

the shell is hinged with an L-shaped swing arm, the rear end part of the L-shaped swing arm is connected with a ball bearing, a straight spring is fixedly connected to the inner wall of the shell, the other end of the straight spring is connected with the rear end of the L-shaped swing arm, the front end of the L-shaped swing arm is fixedly connected with a movable clamp, and the upper part of the shell is fixedly provided with a horizontally arranged fixed clamp.

Preferably, the L-shaped swing arm is further provided with a first bolt, a limit groove is formed in the side of the L-shaped swing arm, which is located on the ball bearing, the ball bearing penetrates through the other side of the limit groove through the connecting shaft, and the ball bearing is fastened to the end part of the L-shaped swing arm through the first bolt.

Preferably, the withdrawing device comprises two types of push-back parts, wherein the push-back part of the first type comprises an iron sheet positioned in the frame, the front side of the iron sheet is connected with an aluminum alloy frame, and the aluminum alloy frame and the iron sheet synchronously move under the drive of a second driving part, wherein the aluminum alloy frame is used for bearing a spring of a tandem junction;

the second type of push-back part comprises air cylinders, wherein the air cylinders are arranged on two sides of the rear side of the frame, the output ends of the air cylinders are connected with a cross beam which moves horizontally, and the rear side of the cross beam is connected with a plurality of push plates through extension rods.

Preferably, the second driving part comprises a main motor, the output end of the main motor is connected with two chain gears which are meshed through a chain, and the two chain gears are respectively connected with a hexagonal screw and a rotating shaft; wherein the inboard of rotation axis is connected with eccentric disk, and frame one side is connected with the support axle sleeve, rotates on the support axle sleeve to be connected with the axostylus axostyle, and eccentric rod is connected to the outer end of axostylus axostyle, and the upper end of this eccentric rod passes through the transfer rod with the bottom of aluminum alloy shelf and realizes articulating, and the lower extreme is equipped with bearing, and this bearing stretches into eccentric groove inner wall department that is equipped with in the eccentric disk and laminating.

Preferably, the auxiliary piece for preventing the spring deflection is further arranged, the auxiliary piece comprises a bracket and magnets arranged on two sides of the bracket, the bracket is positioned at the position of the movable clamp on the front side, the bracket is provided with two baffle plates fixedly arranged at the movable clamp of the rack and a front protruding block integrally formed at the front end of the baffle plates, the height of the baffle plates is higher than that of the side edges of the clamp plates, the distance between the two baffle plates is larger than the outer diameter of the spring spiral, and the magnets are arranged on the upper surfaces of the two sides of the front end part of the baffle plates.

(III) beneficial effects

After the technical scheme is adopted, compared with the prior art, the invention has the following advantages:

1. according to the machine for alternately connecting the double-cone springs into the spring bed net, the alternate spring pushing device is arranged to push each row of springs input by the externally arranged mechanical arm inwards to the clamping support device at equal time intervals to be clamped and fixed, two adjacent rows of springs which are clamped and fixed serve as series units to realize the series connection through the transversely input coil springs, and the withdrawing device pushes the whole spring bed net after the series connection out of the frame rapidly, so that automatic and efficient production of the spring bed net is realized.

2. The invention relates to a machine for alternately connecting double-cone springs into a spring bed net, wherein a detection part is arranged in the process of inputting steel wire made coil springs, and the length of used steel wire materials is indirectly calculated by recording the tooth number of a pinion in the rotation process through a displacement sensor, so that the accurate materials for the wire of each spring bed are realized, and the technical problems of potential safety hazards, machine faults and the like on the traditional semi-automatic machine are avoided.

3. The invention relates to a machine for alternately connecting double cone springs into a spring bed net, wherein a bolt piece is arranged on an L-shaped swing arm of a clamping and supporting device and used for adjusting the position between the clamping and supporting device and a shell, so as to indirectly adjust the position of a movable clamp to adapt to the size of the spring.

4. The invention relates to a machine for alternately connecting double-cone springs into a spring bed net, which is also provided with an auxiliary piece capable of preventing deflection of the springs for correcting the position of each spring in a first row and keeping the springs to fall on a clamp in a horizontal and relatively balanced state in order to ensure the smoothness of spring input.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a schematic view of the structure of the steel wire conveyor head device of the invention;

FIG. 4 is a bottom view of the wire feeder head assembly of the present invention;

FIG. 5 is a bottom view of the wire feeder head assembly of the present invention shown in an exploded configuration;

FIG. 6 is a schematic view of the structure of the screw seat head of the present invention;

FIG. 7 is a schematic view of the rear side of the alternate spring pushing device of the present invention;

FIG. 8 is a schematic view of the front side of the alternate spring pushing device of the present invention;

FIG. 9 is a partial front schematic view of the present invention;

FIG. 10 is a schematic view of the bottom of the clamping and supporting device of the present invention;

FIG. 11 is a schematic view of a clamping and supporting device according to the present invention;

FIG. 12 is a schematic view of a cam structure according to the present invention;

FIG. 13 is a rear schematic view of an exit device of the present invention;

FIG. 14 is a schematic view of the entry of a string spring at the auxiliary structure of the present invention;

FIG. 15 is a schematic view of the auxiliary member of the present invention;

FIG. 16 is a schematic view of a track slide structure according to the present invention;

fig. 17 is a schematic diagram of the driving part of the present invention.

In the figure: 1 frame, 2 wire conveyor head device, 21 support base, 22 continuous conduction part, 221 roller wheel one, 222 roller wheel two, 223 ring groove, 224 big gear, 225 motor one, 23 spiral seat head, 231 fixed block, 232 spiral block, 233 spiral channel, 24 detection part, 241 displacement sensor, 242 limit wheel, 243 pinion, 3 alternate pushing spring device, 31 driving part one, 311 motor two, 312 turntable, 313 connecting rod, 314 reciprocating rotating rod, 315 reciprocating frame, 316 shaft center rod, 32 linkage part, 321 primary transmission rod, 322 secondary transmission rod, 323 linkage plate, 33 bracket, 34 pushing piece, 341 moving frame, 342 pushing block, 343 sliding groove, 4 clamping support device, 41 shell, 42L swing arm, 43 cam, 44 ball bearing, 45 straight spring, 5 withdrawing device the device comprises a first type of push-back component, a 511 iron sheet, a 512 aluminum alloy frame, a second type of push-back component, a 521 cylinder, a 522 cross beam, a 523 extension rod, a 524 push plate, a 6 connecting seat, a 7-sleeve seat, an 8 swing rod, a 9 driving component II, a 91 total motor, a 92 chain gear, a 93 chain, a 94 hexagonal screw rod, a 95 rotating shaft, a 10 hinging hole site, a 11 mounting hole, a 12 movable clamp, a 13 fixed clamp, a 14 bolt I, a 15 limit groove, a 16 eccentric disc, a 17 transmission rod, a 18 shaft rod, a 19 eccentric rod, a 20 auxiliary component, a 201 bracket, a 202 magnet, a 203 baffle, a 204 front lug, a 25 string spring, a 26 guide rail sliding table, a 27 tooth plate, a 28 moving seat, a 29 gear, a 30 rotating rod, a 301 bottom motor, a 302 sliding plate, a 303 roller, a 31 eccentric groove, a 32 lock head and a 33 limit tension spring.

Detailed Description

The invention is further illustrated by the figures and examples.

As shown in fig. 1-17: a machine for alternately connecting double cone springs into a spring bed net comprises a frame 1, wherein a steel wire conveying machine head device 2, an alternate spring pushing device, a clamping supporting device 4 and a withdrawing device 5 are arranged on the frame 1. The alternate spring pushing means is independently driven by the first driving means 31, and the holding and supporting means 4 and the withdrawing means 5 are jointly driven by the second driving means 9 (the first driving means 31 and the first driving means 31 are described in detail below).

The machine completed the spring bed net mainly goes through the following 4 steps.

Step one is that the wire conveyer head device 2 winds the wire into a coil spring and continuously inputs the coil spring to the spring along the horizontal direction.

And secondly, pushing each row of springs input by an external manipulator inwards to the clamping support device 4 for clamping and fixing at equal time intervals by the alternative spring pushing device, and connecting two adjacent rows of springs which are clamped and fixed in series as a series unit through transversely input coil springs. (the manipulator device is not an improvement of the machine of the present embodiment, namely, the manipulator device can input the spring to the spring pushing device of the frame 1)

And thirdly, ejecting the springs of the first two rows (namely the 3 rd rows) after the connection of the springs of the next row by the aid of the alternate spring pushing device, connecting the springs of the first two rows with the springs of the next row in a connection mode, and continuously connecting the springs of the next row in a connection mode in an alternate connection mode until a spring bed net with a required size (row number) is formed.

And step four, the whole spring bed net is quickly withdrawn from the frame 1 by the withdrawing device 5 so as to be convenient for the first row of springs forming the next spring bed net to enter.

The alternate spring pushing device pushes springs in a stepping mode, the displacement of each pushing is consistent with the size of a bottom ring or a top ring of each spring, the springs are pushed twice when the first row of springs of each spring bed net are pushed, the rest rows of springs are pushed once, and the time node of each pushing is exactly the time when the coil springs input in the horizontal direction are connected in series with the longitudinally adjacent two rows of springs.

The specific process of pushing the first row of springs twice is that the first time is to bring the springs to the fixed clamp 13 for fixing (the movable clamp 12 is flush with the fixed clamp 13 at this time) through the pushing block 342, the second time is to push the second row of springs continuously to the movable clamp 12 (the movable clamp 12 continuously tilts to be flush with the fixed clamp 13 in the pushing process), the synchronous hexagonal screw 94 drives the cam 43 to rotate, so that the movable clamp 12 moves from the lowest position to the flush position with the fixed clamp 13 again, the clamping of the first row of springs is realized, and when the second row of springs are pushed to the fixed clamp 13, the serial springs 25 are completed by matching with the input coil springs.

In the process of stringing the springs 25, the clamping and supporting device 4 always clamps and fixes two rows of springs at corresponding positions, after stringing, the springs are in a loose state for the front row of springs to be ejected and the rear row of springs to be ejected, and when the rear row of springs are pushed in, the clamping of the two rows of springs at the joint positions is realized again, and the springs are circulated in sequence; the pushing-in clamping and the withdrawing-out loosening are alternately engaged in time to complete the alternate string of springs 25.

After each spring bed net is formed by a plurality of rows of spring strings, as the spring pushing device pushes a row of springs into and ejects a row of springs to the forefront side all the time after the strings of the spring bed nets are completed, the first row of springs for manufacturing the next spring bed net still can be connected with the previous spring bed net in strings, and normal production cannot be realized, so that the whole spring bed net after each string is completed can be quickly withdrawn by arranging the pushing device, and each spring bed net can be formed by string knots according to the required size.

The following describes the apparatus in detail.

Referring to fig. 3 to 6, the wire feeder head device 2 includes a support base 21 provided at one side of the frame 1, and a continuous conductive member 22 and a screw base head 23 at an input end are sequentially arranged on the support base 21 along a wire penetrating direction. The continuous conduction part 22 is used as a driving station of the steel wire and is used for continuously inputting the steel wire into the spiral seat head 23 and penetrating into a machine to perform the operation of the string spring 25; the screw seat head 23 is used for screwing the straight steel wire when in, and forms a spiral shape for the string spring 25 required to be processed when out.

The continuous conductive member 22 includes: the first rolling wheel 221 serving as a driving station and the second rolling wheel 222 serving as a driven station are respectively provided with a ring groove 223, the ring grooves 223 of the first rolling wheel 221 and the second rolling wheel 222 are in clearance correspondence to form steel wire perforation, and meanwhile, the two rolling wheels are attached to steel wires and drive the steel wires to advance in the rotating process.

The lower sides of the first rolling wheel 221 and the second rolling wheel 222 are coaxially connected with a large gear 224, the two large gears 224 are meshed with each other, so that the first rolling wheel 221 and the second rolling wheel 222 can synchronously rotate, wherein the lower side of the first rolling wheel 221 of the driving station is provided with a first motor 225, and the output end of the first motor 225 is coaxially connected with the first rolling wheel 221 so as to drive the first rolling wheel 221 and the second rolling wheel 222 to synchronously rotate.

The screw seat head 23 is a die for screwing the straight wire. The screw seat head 23 includes: the fixed block 231 with the horizontal channel is fixedly connected to the supporting seat 21 through a limiting block. The inner side of the fixed block 231 is connected with a hollow spiral block 232, a spiral channel 233 is formed on the spiral block 232, steel wires are transmitted into the spiral block 232 from the horizontal channel, and the steel wires are threaded out of the spiral channel 233 to form a spiral shape.

According to the scheme, aiming at the further improvement of the wire conveying machine head device 2, the problem that in the first step, in the coil spring input process, due to the fact that the wire is used up or broken, the machine cannot detect the use condition of the wire and the machine clamping fault occurs, in the serious case, the machine is damaged because the machine is not detected to cause collision between the next row of springs and the last row of springs in the spring conveying process, and if operators exist nearby, even safety hazards exist.

Thus, the device is provided with a detection member 24 for detecting the length of wire input into use. Specifically, the detecting section 24 includes: the displacement sensor 241 arranged on the supporting seat 21 and the limiting wheels 242 pivoted on the supporting seat 21 are arranged, the limiting wheels 242 are attached to the steel wires, and the two limiting wheels 242 rotate along with the steel wires in the penetrating process.

One of the limiting wheels 242 is coaxially connected with a pinion 243, and the pinion 243 and the displacement sensor 241 are arranged on the reverse side of the limiting wheel 242. The specific detection mode is that the displacement sensor 241 directly calculates the length of the used steel wire material through the number of teeth recorded in the rotation process of the pinion 243 and the number of teeth recorded in the conversion of the corresponding circumference, thereby realizing the accurate material for the steel wire of the string spring 25 of each spring bed and avoiding the technical problems of potential safety hazards, machine faults and the like on the traditional semi-automatic machine.

Referring to fig. 7-8, the alternative spring pushing device comprises a first driving component 31 arranged on the frame 1, wherein the output end of the first driving component 31 is connected with a linkage component 32, the front side of the frame 1 is connected with a bracket 33, the bracket 33 is slidably connected with a pushing piece 34, and the linkage component 32 is connected with the pushing piece 34 and drives the pushing piece 34 to reciprocate along a sliding groove 343 formed in the bracket 33.

The first driving part 31 comprises a second motor 311, the second motor 311 is positioned at the bottom of the rear side of the frame 1, the output end of the second motor is connected with a rotary table 312, a connecting rod 313 is hinged on the rotary table 312, the other end of the connecting rod 313 is hinged with a vertically arranged reciprocating rotary rod 314, and the top of the reciprocating rotary rod 314 is fixedly connected with a reciprocating frame 315. The middle part of the reciprocating rod 314 is pivoted with a shaft rod 316, and the reciprocating rod 314 swings (rotates) back and forth with small amplitude by taking the shaft rod 316 as the center of a circle under the indirect driving of the connecting rod 313 below.

Still include connecting seat 6, the both sides of frame 1 are located to connecting seat 6, and the both ends of axle center pole 316 are connected with connecting seat 6 through the bearing, and then play the effect of supporting axle center pole 316. The sleeve seats 7 are arranged on two sides of the shaft center rod 316, the upper sides of the sleeve seats 7 are connected with the swing rods 8, the inner sides of the swing rods 8 are hinged with the reciprocating frame 315, and therefore driving acting force of the motor two 311 is transmitted to the swing rods 8 on two sides, and the swing rods 8 rotate in a certain amplitude.

The linkage part 32 comprises a first-stage transmission rod 321 and a second-stage transmission rod 322, wherein the first-stage transmission rod 321 is hinged with the upper end of the swing rod 8, the first-stage transmission rod 321 and the second-stage transmission rod 322 are connected through a linkage plate 323 and are connected in a hinged mode, the other end of the second-stage transmission rod 322 is hinged with the pushing piece 34, and the linkage part 32 is used for transmitting the driving acting force of the driving part to the pushing piece 34 so as to realize the rapid pushing of the rear spring.

The pushing member 34 includes a moving frame 341, where the moving frame 341 is an elongated plate with two raised ends and a middle part disposed in the bracket 33, and the raised ends are located outside the bracket 33 and hinged to the secondary transmission rod 322. Wherein the bracket 33 is obliquely provided with a chute 343, and the plate moves reciprocally along the direction of the chute 343. The pushing blocks 342 are arranged on the plate at equal intervals (the pushing blocks 342 are movably connected through bolts), and the pushing blocks 342 move synchronously with the plate.

In use, the spring is initially compressed slightly to be clamped through the push block 342, and then the two-stage transmission rods 322, the plates and the push block 342 are arranged at the upper side and the lower side in a mirror image mode, and meanwhile, an opening shape with a large outer side and a small inner side is formed between the upper plate and the lower plate so as to be clamped relatively firmly in the spring input process.

Each time the push block 342 is pushed, a corresponding row of springs can enter the stringing station to finish stringing with the springs of the previous row.

The present solution further improves the alternative spring pushing device, and the turntable 312 is provided with a plurality of hinge holes 10 for converting hinge points at one end of the connecting rod 313, so as to flexibly control the swing amplitude of the reciprocating rotary rod 314, and it should be noted that the control of the swing amplitude corresponds to the displacement pushed by each row of springs, so as to adapt to springs with different sizes.

Secondly, in this scheme, the spring needs to be slightly compressed to be clamped through the push block 342, specifically, the two-stage transmission rod 322, the moving frame 341 and the push block 342 are arranged on the upper and lower sides in a mirror image mode, and meanwhile, an opening shape with a large outer side and a small inner side is formed between the upper and lower plates so as to be clamped relatively firmly in the spring input process.

The upper and lower push blocks 342 drive the springs clamped in the middle to synchronously move in the horizontal direction. It should be noted that during the installation process, a slight deviation of several millimeters in size (a slight deviation of the production itself) is liable to occur, resulting in a slight deviation of the bottom and top spring rings in the longitudinal direction, which affects the yield. Therefore, the size of the plurality of mounting holes 11 is adjusted in the vertical direction of the linkage plate 323, sufficient allowance is given, the lengths of the upper, lower, left and right secondary transmission rods which are finally mounted are kept in absolute unity, the process of pushing the springs is always balanced, the string connection of the springs is more stable, and the production efficiency is higher.

Referring to fig. 9-12, the clamping and supporting device 4 includes a housing 41 disposed on the frame 1, a cam 43 is disposed in the housing 41, the cam 43 is shaped like a shoe-shaped gold ingot and is sleeved on a hexagonal screw 94 of the driving component two 9, and the driving component two 9 drives the cam 43 to rotate by driving the hexagonal screw 94.

The upper side of the shell 41 is provided with a push block 342, and the push block 342 is used for pushing the spring into the fixed clamp 13.

An L-shaped swing arm 42 is hinged to the housing 41, and a ball bearing 44 is connected to the rear end portion of the L-shaped swing arm 42, and the ball bearing 44 is capable of being attached to the cam 43. A straight spring 45 is fixedly connected to the inner wall of the shell 41, and the other end of the straight spring 45 is connected with the rear end of the L-shaped swing arm 42, so that a ball bearing 44 at the rear end of the L-shaped swing arm 42 can be completely attached to the cam 43 in the rotation process all the time.

The front end of the L-shaped swing arm 42 is fixedly connected with a movable clamp 12, a fixed clamp 13 which is horizontally arranged is fixedly arranged at the upper part of the shell 41, and the flexible adjustment of the positions of the two clamps is realized through the cooperation of the rotating position of the cam 43 and the L-shaped swing arm 42.

The process of pushing the push blocks 342 into the springs is specifically described below, the first row of springs are clamped and placed between the upper push block 342 and the lower push block 342 by the manipulator, the push blocks 342 clamp the springs to advance synchronously and drive the springs to push into the fixed clamp 13, and then the next cycle operation is performed in a retreating mode. In the process of pushing in the springs, the ball bearings 44 are attached to the small openings of the cams 43, the jaws between the two clamps are in the maximum size, so that the previous row of springs can be smoothly withdrawn, and when the next row of springs are pushed in, the ball bearings 44 are attached to the large openings of the cams 43 which rotate, so that the clamping and fixing of the springs are realized.

Wherein the push block 342 forms upward tilting edges near two sides of the fixed clamp 13 to resist the bottom ring of the positioning spring, so as to prevent the spring from deviating in position during translation, which results in failure of the string spring 25.

The function of the designed straight spring 45 is to enable the ball bearing 44 at the end part of the L-shaped swing arm 42 to always rotate against the cam 43, and further drive the movable jaw to rotate according to the stroke of the cam 43 so as to clamp and retract the straight spring 45. If the straight spring 45 is not provided, two problems are brought about, and firstly, the movable clamp 12 cannot rotate around the cam 43, so that the stroke is uncontrollable and the corresponding function cannot be realized. Secondly, when the two clamps are at the maximum jaw (i.e. at the minimum opening of the cam 43), the two clamps cannot be retracted, and further the next spring cannot be clamped, and the two clamps need to be manually corrected. The arrangement of the straight springs 45 thus improves the degree of automation to a certain extent, and achieves an improvement in production efficiency.

The present solution further improves the clamping and supporting device 4, and the present solution further provides a bolt member on the L-shaped swing arm 42, for adjusting the position between the L-shaped swing arm and the housing 41, so as to indirectly adjust the position of the movable clamp 12, so as to adapt to the size of the spring, as follows.

The rear side of the L-shaped swing arm 42 is provided with a first bolt 14, and the first bolt 14 is mainly used for indirectly controlling the stroke, namely controlling the rotation amplitude of a ball bearing 44 at the end part of the L-shaped swing arm 42 along with a cam 43, further controlling the up-and-down stroke, and changing the tightness of clamping the spring, thereby enabling the steel wire to be more smoothly connected in series.

Specifically, the L-shaped swing arm 42 is provided with a limit groove 15 on the side of the ball bearing 44, and the ball bearing 44 penetrates to the other side of the limit groove 15 through a connecting shaft and is fastened to the end of the L-shaped swing arm 42 through a first bolt 14. The size of the limiting groove 15 is larger than that of the connecting shaft, so that the limiting groove 15 can move up and down to adjust the joint position of the ball bearing 44 and the cam 43, and finally the L-shaped swing arm 42 is controlled to drive the movable clamp 12 to swing.

The downside of L shape swing arm 42 is equipped with bolt two, and control bolt two makes movable clamp 12 and casing 41 not hard up when, can make movable clamp 12 carry out horizontal direction (control) and remove, changes the position of actual centre gripping, and then can adapt to the bore (the external diameter of spring spiral) of different springs, and control bolt two's elasticity is the line footpath of adaptation spring, also through the setting cooperation L shape swing arm 42 of bolt promptly, can make clamp flexible adaptation not unidimensional spring, therefore the application scope of this scheme supporting seat 21 is wider, has use value more.

Referring to fig. 9 and 13, the withdrawing device 5 includes two types of push-back components, the first type of push-back component 51 includes an iron sheet 511 located in the frame 1, the rear side of the iron sheet 511 is connected with a second driving component 9 located on the frame 1, so that a front-back reciprocating operation can be realized, and the front side is connected with an aluminum alloy frame 512 and moves synchronously with the iron sheet 511. Wherein the aluminum alloy shelf 512 is used to receive the spring of the tandem.

Specifically, the aluminum alloy rack 512 is disposed on the rear side of the frame 1, the iron sheet 511 is connected to the aluminum alloy rack 512, and under the action of the second driving component 9, the iron sheet 511 and the aluminum alloy rack 512 reciprocate towards the horizontal direction to move a small section (the displacement is almost equal to the size of a spring bottom ring), and the spring is driven to move forward synchronously by almost the same distance in the moving process, so that the front springs on the workbench can drive the rear springs to withdraw outwards, and the front springs and the rear springs can withdraw only after the coil springs are connected in series.

The driving part two 9 has a specific structure, which is described later, and mainly can drive the iron sheet 511 and the aluminum alloy rack 512 to reciprocate horizontally.

However, there are problems in that: in the process of recovering the iron sheet 511 and the aluminum alloy frame 512, the problem of recovering the spring which is driven to be placed in synchronous motion can occur, which is equivalent to that the spring does not do the withdrawing operation. And two,: because the traditional machine with the string spring 25 exits the bed net and can be separated from the machine (namely the bed net is completely exited) by pushing the machine with the first type of push-back component 51, but the automatic machine with the string spring 25 does not have time to wait for the pushing action and directly enters the first row of next springs, so that the bed net of the previous row is not completely exited and collides when the next row comes over, the problem of machine clamping occurs, and the surrounding operators don't pay attention to even have safety problems, so the design of the push-back component 52 of the second type of the scheme solves the problems at the same time.

The second type of push-back member 52 includes a cylinder 521, wherein the cylinder 521 is disposed on both sides of the rear side of the frame 1, an output end of the cylinder 521 is connected to a horizontal moving beam 522, and a plurality of push plates 524 are connected to the rear side of the beam 522 through extension rods 523.

Wherein the push plates 524 are horizontally spaced along the cross beam 522 and are equal in number to each row of springs in a single bed net.

Specifically, the push plate 524 is trapezoidal, and the hypotenuse is downward, and the top of push plate 524 is articulated with extension rod 523 for push plate 524 only can overturn towards the outside, and the hypotenuse of push plate 524 all falls into the spring top circle of every row of spring under the normality, and then every row of spring only can outwards withdraw and can't inwards or the side skew, in the whole bed net in-process of withdraw from, also can play the function of spacing bed net, make every bed net that makes withdraw from the orbit all keep highly uniform, the production of bed net finished product is more efficient.

When the cylinder 521 drives the push plate 524 to push outward, the ball bearing 44 of the L-shaped swing arm 42 just fits the small opening of the cam 43, and at this time, the jaw between the two clamps is at the maximum size (i.e. the movable clamp 12 lies outside), so that the bed net can be smoothly withdrawn without obstruction.

The push plate 524 can outwards turn over due to the hinging action in the recovery process along with the cylinder 521, so that the problem of top death with the spring is avoided, and in the recovery process of the aluminum alloy frame 512, the push plate 524 can not inwards turn over, so that the recovery route of the spring is blocked, the single-row withdrawal of the spring is realized, the structural design is ingenious, and the use is convenient.

Below the push plate 524 is an aluminum alloy rack 512, the lower side of the aluminum alloy rack 512 is abutted by a workbench, and the workbench is connected with the rear side of the frame 1.

The second type of exit device 5 is arranged, so that the size of the bed net to be produced can be flexibly controlled, the automation degree of the device is further improved, and the production efficiency is greatly improved in practical application.

Furthermore, the applicant notes during actual use of the string spring 25 machine: when the springs of the first row are pushed in, the front sides and the two sides of the springs are not supported by resistance (correction force), so that the springs are in a relatively suspended state in the process of entering the clamp, each spring of the first row is independently pushed in, in view of the fact that the springs have certain deformation, position deviation is prone to occur, partial springs of the first row are inclined to the two sides or toppled to the front sides, and the operation of the string springs 25 is difficult to finish smoothly. Thus, the design adds an auxiliary member 20 capable of preventing deflection of the spring, as follows.

Referring to fig. 14 to 15, the auxiliary member 20 is embodied as a bracket 201 which serves as a positioning auxiliary together with magnets 202 provided on both sides of the bracket 201.

With the carriage 201 at the front movable clamp 12 position for correcting the position of each spring in the first row, keeping the springs in a horizontal, relatively balanced condition falling on the clamp.

Therefore, the bracket 201 mainly plays a role in positioning the first row of springs, so that each spring of the first row always keeps a uniform pace which is unbiased and balanced relatively and is positioned and arranged at the clamp, the string springs 25 are smooth, the number of defective products is small, and the production efficiency is high.

Specifically, the bracket 201 is two baffle plates 203 fixed at the movable clamp 12 of the frame 1, the height of the baffle plates 203 is higher than the height of the side edges of the clamp, and the distance between the two baffle plates 203 is slightly larger than the outer diameter of the spring spiral, so that the position where the spring in a deflection state enters can be corrected.

The front side of the baffle 203 extends to the front of the clamp on the front side, and the rear side extends to the clamp on the rear side, so that the baffle 203 integrally wraps the spring pushed to the clamp, and further deflection is prevented.

The bracket 201 also has a front bump 204, the front bump 204 is tilted upward and integrally formed at the front end of the baffle 203, and the front bump 204 is engaged with the baffle 203. The front lug 204 and the baffle 203 together form the whole bracket 201, and the spring at the front end part of the baffle 203 is pushed into the clamp, so the front lug 204 is further matched with the baffle 203 to correct the tilted spring, and the skew probability of the spring is greatly reduced.

It should be noted that the carrier 201 only works for the first row of springs and the back row of springs is corrected by the support of the springs relative to the front row of springs without the need for such (because the back row of springs would be strung with the front row of springs when input, and thus no particular centering is required).

Further, the applicant also considers that the springs themselves have a certain inertial impact force when pushed by the mechanical hand into the push plate 524 on the frame 1, and the problem of the springs being pushed onto both sides of the bracket 201 and not being able to be aligned is not excluded during production. Therefore, the magnets 202 are disposed on both sides (specifically, the upper surfaces of both sides) of the front end portion of the baffle 203, so as to generate a balanced attraction force with a buffering effect on the spring, so as to offset the impact force of the spring which is pushed in rapidly, and the positioning effect of the bracket 201 is matched, so that a more accurate placement of the spring is realized (see the drawings for details).

The device is further described, wherein after two rows of springs adjacent to each other in front and back are connected through the spring connection, when two rows of springs are connected in series, the front spring connection needs to be cut off, see fig. 14, a cutter is arranged below the spring connection at the right side of the drawing, the cutter is driven by a hexagonal screw rod to be used, namely when the hexagonal rotation drives the movable clamp 12 to lie outside for the spring to withdraw, the cutter rises (a small hole at the position indicated by the right side in the drawing) to cut off the spring connection, the hexagonal screw rod is continuously rotated, and the movable clamp returns and descends. The cutter is of a conventional structure and is not shown in the drawings.

The following is a supplementary description of the device driving part two 9, see fig. 2 and 17, in which the rotation of the hexagonal screw 94 and the forward and backward movement of the aluminum alloy rack 512 are synchronous driving, specifically, the total motor 91 drives two sprockets 92 (one of which is a driving gear and the other is a driven gear) connected by the chain 93 to rotate, and the two sprockets 92 are respectively connected with the hexagonal screw 94 and the rotating shaft 95.

The hexagonal screw 94 adjusts the position of the movable clamp 12 mainly by rotation of the L-shaped swing arm 42 in the clamp support 4 (for specific adjustment see description of the clamp support 4).

The rotation shaft 95 is mainly used for indirectly driving the aluminum alloy rack 512 to reciprocate. Specifically, the inner side of the rotating shaft 95 is connected with the eccentric disc 16, one side of the frame 1 is inserted with the shaft lever 18 through a supporting shaft sleeve (not shown) to play a supporting role, so that the shaft lever rotates in a autorotation mode, the outer end of the shaft lever 18 is connected with the eccentric rod 19, the upper end of the eccentric rod 19 is hinged with the bottom of the aluminum alloy frame 512 through the transmission rod 17, the other end of the transmission rod 17 is hinged with a lock head 32, and the inner frame of the bottom of the aluminum alloy frame is connected with the lock head 32. The lower end of the eccentric rod 19 extends into the eccentric disc 16 through the connected needle bearing to be attached to the inner wall of the corresponding eccentric groove, so that the eccentric rod can be driven to swing back and forth along with the rotation of the eccentric disc to adjust the position of the aluminum alloy frame, and finally the aluminum alloy frame can reciprocate back and forth in the horizontal direction.

The shaft lever 18 may also be connected with a limit tension spring 33, so that the needle bearing on one side of the eccentric rod 19 always contacts the inner wall of the eccentric notch during the rotation along with the eccentric disc 16 (the principle is similar to that of the ball bearing 44 on the end part of the L-shaped swing arm 42). And also serves to pull the shaft 133 back and back.

The eccentric disc 16 rotates for half a turn to drive the eccentric rod 19 to rotate outwards/inwards by a certain angle, and the eccentric disc 16 rotates for half a turn again to recover to the initial position, so that the aluminum alloy rack 512 is driven to reciprocate at the relative horizontal position, and the springs are withdrawn outwards in a single row and a single row. Synchronously, when the hexagonal screw 94 rotates for half a turn, the movable clamp 12 is driven to lie down, and the movable clamp 12 and the fixed clamp 13 are in the maximum opening state, so that the withdrawal of the spring is not hindered, and when the hexagonal screw 94 rotates for half a turn, the movable clamp 12 is recovered to clamp and fix the spring. The synchronous linkage process ensures that the spring can be smoothly withdrawn from the single row.

Referring to fig. 16, a guide rail sliding table 26 is further arranged at the bottom of the frame 1 and is used for moving the spring stringing machine back and forth to the manipulator of the external conveying spring so as to flexibly adjust the position of the spring on the external manipulator.

The guide rail sliding table 26 is provided with a tooth plate 27, four sides of the bottom of the frame 1 are respectively connected with a movable seat 28, a gear 29 is pivoted in the movable seat 28, and the gear 29 is meshed with the tooth plate 27.

In the use process, the gears 29 on the two sides of the front are coaxially connected through the rotating rod 30, and the rotating rod 30 drives the gears 29 to rotate on the tooth plate 27 through the driving of the bottom motor 301 (the speed reducer can realize the transformation of the driving direction), so that the frame 1 can realize the movement. Wherein the front gear 29 acts as a driving wheel and the rear two gears 29 act as driven wheels.

Further, the sliding plate 302 is connected to the guide rail sliding table 26, the roller 303 coaxially connected to the gear 29 is arranged in the moving seat 28, and the roller 303 is slidably connected to the sliding plate 302, so that the weight of the whole frame 1 can be well supported. The arrangement of corresponding parts at the guide rail sliding table 26 has larger bearing capacity, and can better support and move the frame 1.

The guide rail slipway 26 and the arrangement of related components are mainly used for actively adjusting the deviation point position for controlling the position of the spring on the external manipulator, namely the guide rail slipway 26 can help the manipulator to feed the position of the spring to be more accurate in the horizontal movement adjustment process of the spring stringing machine, and the accurate positioning effect is achieved.

The above-described embodiments are intended to suggest that, in view of the above description, various changes and modifications may be made by the worker without departing from the spirit of the invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims

1. A machine for alternately connecting double cone springs into a spring bed net, comprising a frame, characterized in that: the machine frame is characterized in that a steel wire conveying machine head device is arranged on one side of the machine frame and used for continuously inputting a steel wire coiled into a coil spring into the machine frame along the horizontal direction, an independent driving alternate spring pushing device, a combined driving clamping supporting device and a withdrawing device are sequentially arranged on the machine frame along the trend of the spring, wherein the alternate spring pushing device pushes each row of springs input by an externally arranged manipulator inwards to the clamping supporting device at equal time intervals to be clamped and fixed, two adjacent rows of springs which are clamped and fixed are used as serial units to realize stringing through the transversely input coil spring, and the withdrawing device pushes the whole spring bed net after stringing out of the machine frame rapidly; the withdrawing device comprises two types of push-back parts, wherein the push-back part of the first type comprises an iron sheet positioned in the frame, the front side of the iron sheet is connected with an aluminum alloy frame, the aluminum alloy frame and the iron sheet are driven by a second driving part to synchronously move, and the aluminum alloy frame is used for bearing a spring of a tandem junction; the second type of push-back component comprises air cylinders, wherein the air cylinders are arranged on two sides of the rear side of the frame, the output ends of the air cylinders are connected with a cross beam which moves horizontally, and the rear side of the cross beam is connected with a plurality of push plates through extension rods; the push plate is trapezoid, the inclined edge faces downwards, the top of the push plate is hinged with the extension rod, the push plate can only turn outwards, and the inclined edge of the push plate falls into the spring top ring of each row of springs in a normal state;

The machine finished spring bed net comprises the following steps:

step one: the wire conveyer head device continuously inputs the wire coiled into a coil spring to the spring along the horizontal direction;

step two: the alternating spring pushing device pushes each row of springs input by the external manipulator inwards to the clamping support device for clamping and fixing at equal time intervals, and two adjacent rows of springs which are clamped and fixed serve as series units to realize series connection through transversely input coil springs;

step three: the next row of springs are pushed out by the spring pushing device alternately, and are connected with the first row of springs in a stringing way, and the springs are continuously connected in an alternating stringing way until a spring bed net with a required size is formed;

step four: the withdrawing device rapidly withdraws the whole spring bed net from the frame so as to allow the first row of springs forming the next spring bed net to enter; the alternate spring pushing device pushes springs in a stepping mode, the displacement of each pushing is consistent with the size of a bottom ring or a top ring of each spring, the springs are pushed twice when the first row of springs of each spring bed net are pushed, the rest rows of springs are pushed once, and the time node of each pushing is exactly the time when the coil springs input in the horizontal direction are connected in series with the longitudinally adjacent two rows of springs.

2. A machine for alternately connecting double cone springs into a spring bed net according to claim 1, wherein: the steel wire conveying machine head device comprises a supporting seat arranged on one side of the frame, and a continuous conduction component and a spiral seat head are sequentially arranged on the supporting seat along the penetrating direction of the steel wire; the continuous conduction component comprises a first rolling wheel serving as a driving station and a second rolling wheel serving as a driven station, annular grooves are formed in the first rolling wheel and the second rolling wheel, annular groove gaps of the first rolling wheel and the second rolling wheel correspondingly form steel wire perforation holes, large gears are coaxially connected to the lower sides of the first rolling wheel and the second rolling wheel, the two large gears are meshed with each other, a first motor is arranged at the lower side of the first rolling wheel of the driving station, and an output end of the first motor is coaxially connected with the first rolling wheel; the screw seat head comprises a fixed block provided with a horizontal channel, the fixed block is fixedly connected to the supporting seat through a limiting block, the inner side of the fixed block is connected with a hollow screw block, and the screw block is provided with a screw channel.

3. A machine for alternately connecting double cone springs into a spring bed net according to claim 2, wherein: the detection component comprises a displacement sensor arranged on the supporting seat and a limiting wheel pivoted on the supporting seat, wherein the limiting wheel is provided with two limiting wheels and is attached to the steel wire; one of the limiting wheels is coaxially connected with a pinion, and the pinion and the displacement sensor are arranged on the back surface of the limiting wheel.

4. A machine for alternately connecting double cone springs into a spring bed net according to claim 1, wherein: the alternating spring pushing device comprises a first driving component arranged on the frame, the output end of the first driving component is connected with a linkage component, the front side of the frame is connected with a bracket, the bracket is connected with a pushing piece in a sliding manner, and the linkage component is connected with the pushing piece and drives the pushing piece to reciprocate along the direction of a sliding groove formed in the bracket; the first driving part comprises a second motor, the second motor is positioned at the bottom of the rear side of the frame, the output end of the second motor is connected with a rotary table, a connecting rod is hinged on the rotary table, the other end of the connecting rod is hinged with a vertically arranged reciprocating rotating rod, and the top of the reciprocating rotating rod is fixedly connected with a reciprocating frame; wherein the middle part of the reciprocating rotating rod is pivoted with a shaft core rod; the device also comprises a connecting seat, wherein the connecting seat is arranged at two sides of the frame, two ends of the shaft core rod are connected with the connecting seat through bearings, sleeve seats are arranged at two sides of the shaft core rod, the upper side of each sleeve seat is connected with a swing rod, and the inner side of each swing rod is hinged with the reciprocating frame; the linkage part comprises a primary transmission rod and a secondary transmission rod, wherein the primary transmission rod is hinged with the upper end of the swing rod, the primary transmission rod is connected with the secondary transmission rod through a linkage plate and is connected with each other in a hinged mode, and the other end of the secondary transmission rod is hinged with the pushing piece; the pushing piece comprises a movable frame and a pushing block, wherein the movable frame is a strip plate with two raised ends and a middle part arranged in the bracket, the raised parts of the two ends are positioned at the outer side of the bracket and are hinged with the secondary transmission rod, a sliding groove is obliquely formed in the bracket, and the plate moves back and forth along the sliding groove direction; the pushing blocks are arranged on the plate at equal intervals.

5. A machine for alternately connecting double cone springs into a spring bed net as set forth in claim 4 wherein: the turntable is provided with a plurality of hinge holes for converting hinge points at one end of the connecting rod.

6. A machine for alternately connecting double cone springs into a spring bed net as set forth in claim 4 wherein: the clamping and supporting device comprises a shell arranged on the frame and a second driving part, wherein a cam is arranged in the shell, is in a shoe-shaped gold ingot and is sleeved on a hexagonal screw rod arranged on the second driving part, and the second driving part drives the hexagonal screw rod to drive the cam to rotate; the upper side of the shell is provided with a push block which is used for pushing the spring into the fixed clamp, and the push block forms upward tilting edges close to the two sides of the fixed clamp so as to resist the bottom ring of the positioning spring; the shell is hinged with an L-shaped swing arm, the rear end part of the L-shaped swing arm is connected with a ball bearing, a straight spring is fixedly connected to the inner wall of the shell, the other end of the straight spring is connected with the rear end of the L-shaped swing arm, the front end of the L-shaped swing arm is fixedly connected with a movable clamp, and the upper part of the shell is fixedly provided with a horizontally arranged fixed clamp.

7. A machine for alternately connecting double cone springs into a spring bed net according to claim 6, wherein: the L-shaped swing arm is further provided with a first bolt, a limit groove is formed in the side of the L-shaped swing arm, which is located on the ball bearing, the ball bearing penetrates through the other side of the limit groove through the connecting shaft, and the ball bearing is fastened to the end portion of the L-shaped swing arm through the first bolt.

8. A machine for alternately connecting double cone springs into a spring bed net according to claim 1, wherein: the second driving part comprises a main motor, the output end of the main motor is connected with two chain gears which are meshed through a chain, and the two chain gears are respectively connected with a hexagonal screw rod and a rotating shaft; wherein the inboard of rotation axis is connected with eccentric disk, and frame one side is connected with the support axle sleeve, rotates on the support axle sleeve to be connected with the axostylus axostyle, and eccentric rod is connected to the outer end of axostylus axostyle, and the upper end of this eccentric rod passes through the transfer rod with the bottom of aluminum alloy shelf and realizes articulating, and the lower extreme is equipped with bearing, and this bearing stretches into eccentric groove inner wall department that is equipped with in the eccentric disk and laminating.

9. A machine for alternately connecting double cone springs into a spring bed net according to claim 1, wherein: the auxiliary piece comprises a bracket and magnets arranged on two sides of the bracket, the bracket is located at the position of the movable clamp on the front side, the bracket is provided with two baffle plates fixedly arranged at the movable clamp of the frame and a front protruding block integrally formed at the front end of the baffle plates, the height of the baffle plates is higher than that of the side edges of the clamp plates, the distance between the two baffle plates is larger than the outer diameter of the spring spiral, and the magnets are arranged on the upper surfaces of the two sides of the front end parts of the baffle plates.