CN104886955A - Desk with automatic travelling function - Google Patents

Abstract

An automatic walking desk, including a table body (A), a left leg mechanism assembly (B), a right leg mechanism assembly (C); the motor (Ac-2) in the desk body (Af) passes through the motor mounting hole (Af- 4-2) Fixed connection; the left side of the speed change device (Ad) in the table body (A) is connected through the rotation between the speed change pulley (Ad-5) and the left speed change pulley sliding sleeve (Ab-5), and the thimble on the right side The chute (Ad-11) is fixedly connected with the stud mounting holes (Af-1-2) in the table body (Af); the left mounting plate (Af- 3) It is fixedly connected with the left frame support assembly (Bf); the base (Be-1) in the tensioning device (Be) is fixedly connected with the left frame support assembly (Bf); the table body (Af) in the table body (A) ) on the right side of the mounting plate (Af-3) is fixedly connected with the right rack support bar (Cf) to realize the connection between the table body (A), the left leg mechanism assembly (B) and the right leg mechanism connect. Use the present invention to effectively reduce human body consumption and be used in the direction of school student desks or family desks.

Description

An automatic walking desk

technical field

The invention relates to an automatic walking desk, in particular to a desk that can liberate people's hands for transportation and realize omnidirectional movement on the ground or short-distance transportation of materials in space.

Background technique

With the increasing pressure on students, our country has begun to reduce the burden on primary and middle school students, but for students, they still need to buy more tutorial books to make up for their knowledge. The increase of books increases the bearing capacity of the desk, and students need more force when moving the desk.

In our country, there is no walking mechanism to solve such problems. The principle of body movement is modified on the basis of the Chebyshev principle. The Chebyshev principle is too high for leg lifts and poor stability to be modified and redesigned. The height of the raised legs is only 1/3 of the original height, which can not only improve the stability of the movement of the body, but also prolong the life of the various parts of the body.

Contents of the invention

The problem to be solved by the invention is a device that can help students easily move the desk.

Technical scheme of the present invention:

An automatic walking desk comprises a desk body, a left leg mechanism assembly, and a right leg mechanism assembly.

The table body includes an inspection board, a transmission device, a prime mover, a speed change device and a table body.

The maintenance plug-in board is inserted and connected with the plug-in board slideway group behind the table body through the slideways on both sides. The left transmission shaft positioning device and the right transmission shaft positioning device in the transmission device are fixedly connected with the transmission shaft positioning device mounting holes in the component mounting plate. The original moving device is fixedly connected with the table body through the motor mounting hole. The speed change pulley in the speed change device is connected with the left speed change pulley sliding sleeve in the transmission device. The thimble slide groove in the transmission device is fixedly connected with the slide groove mounting hole. The double-ended stud in the transmission device is fixedly connected with the double-ended stud installation hole.

The left leg mechanism component is a single-degree-of-freedom link mechanism, the left frame support in the left leg mechanism component is fixedly connected with the left side mounting plate of the table body in the table body, and the loading device on the left frame support bar The mounting holes connect to the base in the tensioner.

The right leg mechanism assembly is a single-degree-of-freedom link mechanism, and the right frame support in the right leg mechanism assembly is fixedly connected with the table body left side mounting plate in the table body.

Through the above connection, the assembly of the automatic walking desk mechanism is completed, and the automatic walking desk realizes walking by driving the pulley to rotate through the output shaft of the motor. The pulley drives the rotating transmission device to rotate through the V-belt. The transmission device uses the right pulley to transmit part of the power to the right leg mechanism pulley in the right leg mechanism assembly to make it rotate, and the right leg mechanism pulley drives the entire right leg mechanism assembly through the intermediate shaft The other part drives the rotation of the left speed change pulley sliding sleeve through the transmission shaft, and changes the distance between the speed change pulley and the left speed change pulley sliding sleeve by adjusting the position of the chute thimble in the speed change device in the thimble chute. Thereby, the rotational speed of the V-belt drive to the left leg mechanism assembly can be changed, so that the left and right turns of the automatic walking desk can be realized.

The left leg mechanism assembly includes the left first assembly to the left sixth assembly being the leg assembly and the left first rod member to the left fourteenth rod member being connecting rods.

The left first component contains the left first member to the left sixth member, and its degree of freedom is 1.

The rods contained in the left second component to the left fourth component are the same in shape and size and connected in the same way as the first component.

A mounting hole is provided between the left fifth component and the left sixth component, which can be installed and positioned.

Left side bearing cover, torsion shaft, left leg mechanism belt pulley, right side bearing cover and rotating shaft are provided in the sixth assembly on the left side.

The left first bar is made of a straight bar with holes at both ends and in the middle, and it is an important executive member connecting the left second bar and the left third bar.

The left second rod is made of half the length of the left first rod, and mounting holes are respectively arranged at its two ends, and one end thereof is used to be rotatably connected with the rotating shaft.

The third left rod is the smallest short rod. The third left rod transmits the torque from the motor and is the core of the movement of the whole left first assembly. One end of the third left rod is fixedly connected with the torsion shaft.

Mounting holes are arranged on the upper end of the left fourth rod, and the connection method is connected by a mother-in-female combination rivet, and holes are punched every 30mm at the lower end for length adjustment of the left fifth rod.

The lower end of the left fifth rod is the same as the left fourth connecting rod. Holes are punched every 30mm for length adjustment of the left fourth rod.

The left sixth rod is that the foot pad prevents the wear of the left fifth rod on the ground.

The left seventh bar to the left ninth bar are installed in the same manner and size as the left fourth bar.

The tenth member on the left is the same as the third member on the left in terms of size, installation and emptying.

The left eleventh bar is the same size as the left twelfth bar, and the left and right ends are respectively provided with mounting holes.

The two ends of the left thirteenth rod and the left fourteenth rod are provided with installation holes, and the installation position and size of the torsion shaft in the sixth component are the same.

In the left first assembly, the upper end mounting hole of the left first rod is fixedly connected with the left fourth rod mounting hole, the middle mounting hole is fixedly connected with the left second rod upper end mounting hole, and the lower end mounting hole is fixed with the left third rod upper end The holes are fixed. The mounting hole at the lower end of the left second bar is rotationally connected to the left side of the first shaft of the rotating shaft in the left sixth assembly. The upper end of the left third rod is fixedly connected with the left end installation hole of the left twelfth rod, and the lower end installation hole is fixedly connected with the left side of the first shaft of the torsion shaft in the left sixth assembly. The left fourth rod is socketed with the left fifth rod. The left sixth rod is fixedly connected with the left fifth rod. In the left second component, the upper end of the tenth rod on the left is fixedly connected to the mounting hole on the right side of the thirteenth rod, and the connection methods and sizes of the other rods are the same as those of the first left component. The left third component and the left fourth component are internally connected in the diagram. The left first component is the same as the left sixth component. The left eleventh rod is respectively welded to the periphery of the first mounting hole at the lower end of the left fourth rod and the left eighth rod through the mounting holes at the left and right ends, and the diameter of the mounting holes is reserved. The left twelfth rod is respectively welded to the periphery of the fourth mounting hole below the left seventh rod and the left ninth rod through the mounting holes at the left and right ends, and the diameter of the mounting holes is reserved.

The parts structure, size, connection relation and degree of freedom of the right leg mechanism assembly and the left leg mechanism assembly are the same.

The way that the automatic walking desk realizes walking is to drive the pulley and rotate through the output shaft of the motor. The pulley drives the rotating transmission device to rotate through the V-belt. The transmission device uses the right pulley to transmit part of the power to the right leg mechanism pulley in the right leg mechanism assembly to make it rotate, and the right leg mechanism pulley drives the entire right leg mechanism assembly through the intermediate shaft The other part drives the rotation of the left speed change pulley sliding sleeve through the transmission shaft, and changes the distance between the speed change pulley and the left speed change pulley sliding sleeve by adjusting the position of the chute thimble in the speed change device in the thimble chute. Thereby, the rotational speed of the V-belt drive to the left leg mechanism assembly can be changed, so that the left and right turns of the automatic walking desk can be realized.

The present invention has the beneficial effect compared with prior art:

The beneficial effect of the present invention is that the mechanical connection mode of each side leg of the automatic walking table is a single-degree-of-freedom closed-chain structure. High carrying capacity and high movement efficiency. The speed change device in this machine is stepless speed change, which can freely adjust the turning radius of the walking table. An automatic walking desk can effectively reduce the loss of handling, and can be used as a school or a family desk.

Description of drawings

Figure 1 is an overall three-dimensional view of an automatic walking desk.

Figure 2 The three-dimensional view of the table body.

Figure 3 is a three-dimensional diagram of the internal components of the table body.

Figure 4 Three-dimensional diagram of the transmission device.

Figure 5 outline drawing of prime mover.

Fig. 6 Three-dimensional exploded view of the transmission device.

Fig. 7 Three-dimensional diagram of the shift lever chute, the shift lever chute cover, and the thimble chute.

Figure 8 Outline drawing of left leg mechanism assembly.

Figure 9 Outline drawing of the left rack support assembly.

Figure 10 Three-dimensional view of the tensioning device.

Figure 11 Outline view of the right leg mechanism assembly.

Figure 12 Outline drawing of the right rack support assembly.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

An automatic walking desk, as shown in FIG. 1 , a desk body A, a left leg mechanism component B, and a right leg mechanism component C.

The left side mounting plate A-f-2 of the table body in the table body A is fixedly connected with the left frame support assembly B-f in the left leg mechanism assembly B. The mounting plate A-f-3 on the right side of the table body in the table body A is fixedly connected with the right frame support rod C-f in the right leg mechanism assembly C, so as to realize the table body A, the left leg mechanism assembly B and the right leg mechanism assembly C the connection between.

The table body A includes an inspection board A-a, a transmission device A-b, a prime mover device A-c, a transmission device A-d, and a table body A-f.

The maintenance inserting plate A-a is inserted and connected with the inserting plate slideway group A-f-4-1 behind the table body A-f through slideways on both sides. The left transmission shaft positioning device A-b-4 and the right transmission shaft positioning device A-b-2 in the transmission device A-b are fixedly connected with the transmission shaft positioning device mounting hole A-f-4-3 in the component mounting plate A-f-4. The prime mover A-c is fixedly connected with the table body A-f through the motor mounting hole A-f-4-2. The speed change pulley A-d-5 in the speed change device A-d is connected with the left speed change pulley sliding sleeve A-b-5 in the transmission device A-b. The thimble chute A-d-11 in the transmission device A-d is fixedly connected with the chute mounting hole A-f-1-1. The double-ended stud A-d-12 in the transmission device A-d is fixedly connected with the double-ended stud mounting hole A-f-1-2.

The transmission device A-b includes a right pulley A-b-1, a right transmission shaft positioning device A-b-2, a transmission shaft A-b-3, a left transmission shaft positioning device A-b-4, and a left speed change pulley sliding sleeve A-b-5.

The right pulley A-b-1 is connected with the power transmission shaft A-b-3 by a tight key. The right drive shaft positioning device A-b-2 and the drive shaft A-b-3 are rotationally connected through bearings. The left drive shaft positioning device A-b-4 and the drive shaft A-b-3 are rotationally connected through bearings. The left speed change pulley sliding sleeve A-b-5 is connected with the shaft A-b-3 by a tight key.

The prime mover A-c includes a pulley A-c-1 and a motor A-c-2.

The pulley A-c-1 is fixedly connected with the motor A-c-2 through the output shaft.

The transmission device A-d includes gear lever A-d-1, gear lever chute cover A-d-2, U-shaped slider A-d-3, pulley thimble A-d-4, speed change pulley A-d-5, chute thimble A-d-6 , Fixed block A-d-7, ball handle A-d-8, gear lever cover A-d-9, gear lever chute A-d-10, thimble chute A-d-11, stud A-d-12.

The ball handle A-d-8 is fixedly connected with the gear lever cover A-d-9. The gear lever sleeve A-d-9 is rotationally connected with the gear lever A-d-1. The gear lever A-d-1 is fixedly connected with the fixed block A-d-7. The gear lever chute A-d-10 is fitted with the gear lever chute cover A-d-2 through the built-in chute. The variable speed pulley A-d-5 is fixedly connected with the pulley thimble A-d-4 through the center hole of the pulley. The U-shaped slide block A-d-3 is slidably connected with the pulley thimble A-d-4 through the U-shaped slideway. The thimble A-d-6 of the chute is fixedly connected with the U-shaped slide block A-d-3. The thimble chute A-d-11 is connected with the thimble thimble A-d-10 through the slideway, so that the thimble thimble A-d-10 can slide freely in the thimble chute A-d-11.

The configuration, parts and connection methods of the left leg mechanism component B and the right leg mechanism component C are exactly the same. Left leg mechanism assembly B includes left front leg group B-a, right front leg group B-b, right rear leg group B-c, left rear leg group B-d, tensioning device B-e, left end cross bar 3, right end cross bar 4, left frame support assembly B-f , Left front and right rear leg connector 1, left rear and right front leg connector 2, right front telescopic rod cover B-b-4, right rear telescopic rod cover B-c-4, left rear telescopic rod cover B-d-4. Wherein the tensioning device B-e is connected with the left frame support assembly B-f.

The left front leg group B-a includes executive part B-a-1, transmission part B-a-2, driving part B-a-3, left front telescopic rod cover B-a-4, left front telescopic rod B-a-5, left front foot pad B-a-6,

The installation hole at one end of the actuator B-a-1 in the left front leg group B-a is rotatably connected with the installation hole B-a-4 of the left front leg telescopic rod cover, the middle installation hole is rotatably connected with the installation hole at one end of the transmission member B-a-2, and the other end of the actuator B-a-1 is installed The hole is rotationally connected with the mounting hole at the end of the moving part B-a-3. The mounting hole at the other end of the transmission member B-a-2 is rotatably connected to the rotating shaft B-f-3 in the left frame support assembly B-f. The mounting hole at the end of the moving part B-a-3 is rotationally connected with the mounting hole at the end of the left cross bar 3, and the mounting hole at the other end of the moving part B-a-3 is rotationally connected with the torsion shaft B-f-2 in the left frame support assembly B-f. The left front telescopic rod cover B-a-4 is socketed with the left front telescopic rod B-a-5. The left front foot pad B-a-6 is fixedly connected with the left telescopic rod B-a-5. The mounting holes at both ends of the short bar B-d-3 in the left rear leg group B-d are rotationally connected with the left end cross bar 3 and the left frame support assembly B-f. The size characteristics and connection methods of the parts of the right front leg group B-b, the right rear leg group B-c, and the left rear leg group B-d are the same as those of the left front leg group B-a. The left front and right rear leg connectors 1 are welded to the periphery of the first mounting hole at the lower end of the left front telescopic rod B-a-4 and the right rear telescopic rod sleeve B-c-4 respectively through the mounting holes at the left and right ends, and the diameter of the mounting hole is reserved. The left rear and right front leg connectors 2 are respectively welded to the periphery of the fourth mounting hole below the right front telescopic rod sleeve B-b-4 and the left rear telescopic rod sleeve B-d-4 through the mounting holes at the left and right ends, and the diameter of the mounting hole is reserved.

Left frame support assembly B-f comprises left side bearing cover B-f-1, torsion shaft B-f-2, left leg mechanism left leg mechanism pulley B-f-3, right side bearing cover B-f-4, rotating shaft B-f-5.

The torsion shaft B-f-2 and the rotation shaft B-f-5 are respectively connected to the left bearing cover B-f-1 and the right bearing cover B-f-4 in rotation. The left side bearing cover B-f-1 and the right side bearing cover B-f-4 are fixedly connected with the left frame support assembly B-f. The belt pulley B-f-3 of the left leg mechanism is connected with the torsion shaft B-f-2 by a positioning pin to ensure that it does not fall off during operation.

The tensioning device B-e is connected with the left frame support assembly B-f. Tensioning device B-e includes base B-e-1, chuck B-e-2, first spring B-e-3, left support frame B-e-4, right support frame B-e-5, pulley B-e-6, sliding shaft B-e-7, the first Two springs B-e-8, spring holder B-e-9.

The pulley B-e-6 is rotatably connected with the sliding shaft B-e-7. Both ends of the sliding shaft B-e-7 are fixedly connected to the left support frame B-e-4 and the right support frame B-e-5 respectively. Spring frame B-e-9 is fixedly connected with left support frame B-e-4 and right support frame B-e-5. The left support frame B-e-4 and the right support frame B-e-5 are fixedly connected with the base B-e-1. The chuck B-e-2 is fixedly connected with the ends of the first spring B-e-3 and the second spring B-e-8. The other ends of the first spring B-e-3 and the second spring B-e-8 are fixedly connected to the spring frame B-e-9. Chuck B-e-2 is inserted and fixed from the slideway of base B-e-1 to ensure smooth sliding.

The way the automatic walking desk realizes walking is to drive the belt pulley A-c-1 to rotate through the output shaft of the motor A-c-2. The belt pulley A-c-1 drives the rotating transmission device A-b to rotate through the V-belt. The transmission device A-b transmits part of the power to the right leg mechanism pulley C-e-1 in the right leg mechanism assembly C by the right pulley A-1 to make it rotate, and the right leg mechanism pulley C-e- 1 Drive the walking movement of the whole right leg mechanism assembly C through the intermediate shaft C-e-2, and the other part drives the rotation of the left speed change pulley sliding sleeve A-b-5 through the transmission shaft A-b-3, and adjust the chute thimble A-d in the speed change device A-d -6 Change the distance between the speed change pulley A-d-5 and the left speed change pulley sliding sleeve A-b-5 at the position of the thimble chute A-d-10, so as to change the rotation speed of the V-belt drive to the left leg mechanism assembly B , so that the left and right turns of the automatic walking desk can be realized.

Claims (1)

1. an automatic walking desk, is characterized in that: a kind of walking desk automatically comprises a body (A), left leg mechanism assembly (B), right leg mechanism assembly (C);

On the left of table body in table body (A), installing plate (A-f-2) is connected with the left frame supporting component (B-f) in left leg mechanism assembly (B); On the right side of table body in table body (A), installing plate (A-f-3) is connected with the right frame support bar (C-f) in right leg mechanism assembly (C), realizes table body (A), connection between left leg mechanism assembly (B) and right leg mechanism assembly (C);

Described table body (A) comprises maintenance plate (A-a), transmission device (A-b), driving device (A-c), speed change gear (A-d), table body (A-f);

Maintenance plate (A-a) to be inserted with the plate skid assemblies (A-f-4-1) after table body (A-f) by both sides slideway and is connected; Left Drive axle positioner (A-b-4) in transmission device (A-b) and right power transmission shaft positioner (A-b-2) are by being connected with the power transmission shaft positioner installing hole (A-f-4-3) in Components installation plate (A-f-4); Driving device (A-c) and table body (A-f) are connected by motor installing hole (A-f-4-2); Speed change belt wheel (A-d-5) in speed change gear (A-d) and the left variable velocity zone in transmission device (A-b) are taken turns sliding sleeve (A-b-5) and are connected; Thimble chute (A-d-11) in speed change gear (A-d) and chute installing hole (A-f-1-1) are connected; Studs (A-d-12) in speed change gear (A-d) and studs installing hole (A-f-1-2) are connected;

Described transmission device (A-b) comprises right belt wheel (A-b-1), right power transmission shaft positioner (A-b-2), power transmission shaft (A-b-3), Left Drive axle positioner (A-b-4), left variable velocity zone wheel sliding sleeve (A-b-5);

Right belt wheel (A-b-1) is connected by tight key with power transmission shaft (A-b-3); Right power transmission shaft positioner (A-b-2) and power transmission shaft (A-b-3) realize being rotationally connected by bearing; Left Drive axle positioner (A-b-4) and power transmission shaft (A-b-3) realize being rotationally connected by bearing; Left variable velocity zone wheel sliding sleeve (A-b-5) is connected by tight key with axle (A-b-3);

Described driving device (A-c) comprises belt wheel (A-c-1), motor (A-c-2);

Belt wheel (A-c-1) is fixedly connected with by output shaft with motor (A-c-2);

Described speed change gear (A-d) comprises lever (A-d-1), lever chute lid (A-d-2), U-shaped slide block (A-d-3), belt wheel thimble (A-d-4), speed change belt wheel (A-d-5), chute thimble (A-d-6), fixed block (A-d-7), ball handle (A-d-8), lever cover (A-d-9), lever chute (A-d-10), thimble chute (A-d-11), studs (A-d-12);

Ball handle (A-d-8) and lever cover (A-d-9) are connected; Lever cover (A-d-9) and lever (A-d-1) are rotationally connected; Lever (A-d-1) and fixed block (A-d-7) are connected; Lever chute (A-d-10) and lever chute lid (A-d-2) are by built-in chute fit; Speed change belt wheel (A-d-5) is affixed by belt wheel centre bore with belt wheel thimble (A-d-4); U-shaped slide block (A-d-3) and belt wheel thimble (A-d-4) are slidably connected by U-shaped slideway; Chute thimble (A-d-6) is affixed with U-shaped slide block (A-d-3); Thimble chute (A-d-11) is connected by slideway with chute thimble (A-d-10), and chute thimble (A-d-10) can be free to slide in thimble chute (A-d-11) the inside;

Described left leg mechanism assembly (B) is identical with right leg mechanism assembly (C) configuration, part and connected mode, left leg mechanism assembly (B) comprises left front leg group (B-a), RAT group (B-b), right rear leg group (B-c), left back leg group (B-d), tensioning apparatus (B-e), left end cross bar (3), right-hand member cross bar (4), left frame supporting component (B-f), left front and right back leg connector (1), left back and right front leg connector (2), right front expansion link cover (B-b-4), right back expansion link cover (B-c-4), left back expansion link cover (B-d-4), wherein tensioning apparatus (B-e) is connected with left frame supporting component (B-f),

Described left front leg group (B-a) comprises executive item (B-a-1), driving member (B-a-2), driving link (B-a-3), left front expansion link cover (B-a-4), left front expansion link (B-a-5), left front foot pad (B-a-6); In left front leg group (B-a), executive item (B-a-1) one end installing hole and left front leg expansion link cover (B-a-4) installing hole are rotationally connected, middle installing hole and driving member (B-a-2) one end installing hole are rotationally connected, and executive item (B-a-1) other end installing hole and driving link (B-a-3) end installing hole are rotationally connected; Turning cylinder (B-f-3) in driving member (B-a-2) other end installing hole and left frame supporting component (B-f) is rotationally connected; Driving link (B-a-3) end installing hole and left end cross bar (3) end installing hole are rotationally connected, and the torsional axis (B-f-2) in driving link (B-a-3) other end installing hole and left frame supporting component (B-f) is rotationally connected; Left front expansion link cover (B-a-4) and left front expansion link (B-a-5) are socketed; Left front foot pad (B-a-6) is affixed with left expansion link (B-a-5); Quarter butt (B-d-3) two ends installing hole in left back leg group (B-d) and left end cross bar (3) and left frame supporting component (B-f) are rotationally connected; RAT group (B-b), right rear leg group (B-c), left back leg group (B-d) accessory size feature are all identical with left front leg group (B-a) with connected mode; Left front and right back leg connector (1) by the installing hole at two ends, left and right respectively with left front expansion link (B-a-4) and right back expansion link cover (B-c-4) lower end first installing hole peripheral solder, and retain installing hole diameter; Left back and right front leg connector (2) by the installing hole at two ends, left and right respectively with right front expansion link cover (B-b-4) and left back expansion link cover (B-d-4) below the 4th installing hole peripheral solder, and retain installing hole diameter;

Left frame supporting component (B-f) comprises left side bearing cap (B-f-1), torsional axis (B-f-2), the left leg mechanism belt wheel (B-f-3) of left leg mechanism, right side bearing cap (B-f-4), turning cylinder (B-f-5);

Torsional axis (B-f-2) and turning cylinder (B-f-5) realize being rotationally connected with left side bearing cap (B-f-1) and right side bearing cap (B-f-4) respectively; Left side bearing cap (B-f-1) and right side bearing cap (B-f-4) and left frame supporting component (B-f) affixed; Left leg mechanism belt wheel (B-f-3) adopts alignment pin to be connected with between torsional axis (B-f-2), ensures in operation process without coming off;

Described tensioning apparatus (B-e) is connected with left frame supporting component (B-f); Tensioning apparatus (B-e) comprises base (B-e-1), chuck (B-e-2), the first spring (B-e-3), left support frame (B-e-4), right support frame (B-e-5), belt wheel (B-e-6), sliding axle (B-e-7), the second spring (B-e-8), spring(-supported) mount (B-e-9);

Belt wheel (B-e-6) and sliding axle (B-e-7) are rotationally connected; The two ends of sliding axle (B-e-7) are connected with left support frame (B-e-4) and right support frame (B-e-5) respectively; Spring(-supported) mount (B-e-9) and left support frame (B-e-4) and right support frame (B-e-5) affixed; Left support frame (B-e-4) and right support frame (B-e-5) are connected with base (B-e-1); Chuck (B-e-2) is connected with the first spring (B-e-3) and the second spring (B-e-8) end winding support; First spring (B-e-3) is fixedly connected with spring(-supported) mount (B-e-9) with the second spring (B-e-8) other end; Chuck (B-e-2) inserts fixing from base (B-e-1) slideway, ensure that slip is smooth and easy.