CN214722086U - Locking tool for automatically locking upper wheel shaft of caster - Google Patents

Abstract

The utility model discloses a locking tool for automatically locking an upper wheel shaft of a caster, which comprises a first sleeve and a second sleeve, wherein the first sleeve can not rotate relatively after being spliced with the head of the wheel shaft, and the second sleeve can not rotate relatively after being spliced with a nut on the wheel shaft; the second sleeve is controlled by a nut locking mechanism fixed on a transverse plate of the lifting frame to move and rotate along the left-right direction; the vertical plate of the lifting frame is connected with the vertical plate of the L-shaped main frame through a lifting adjusting mechanism for adjusting the lifting frame according to the height of the caster wheel shaft; the lifting frame is characterized in that a rear baffle which is matched with a lifting adjusting mechanism to enable the wheel shaft, the first sleeve and the second sleeve to be coaxially arranged is arranged on the transverse plate of the lifting frame and between the first sleeve and the second sleeve. The utility model discloses can the automatic locking truckle go up the shaft, labour saving and time saving, truckle packaging efficiency is high.

Description

Locking tool for automatically locking upper wheel shaft of caster

Technical Field

The utility model relates to a truckle equipment frock, more specifically say, relate to a locking frock of automatic locking truckle upper axle.

Background

As is well known, various tools capable of improving the working efficiency of people with social progress have generally entered into the lives of people, people often need to change the spatial position of a specific object in daily life of people, for example, patients are transported from one place to another place, if the actions are completely realized by manpower, the actions can be realized by matching with a plurality of transporters, and in order to improve the working efficiency, a plurality of beds capable of assisting people in moving patients, such as movable sickbeds, transportation beds and the like, appear on the market at present, the tools have a common point in structure, namely, the tools can work by necessarily needing to be provided with casters, and the requirement that people can easily and stably move heavy objects can be met through the design of the casters in the specific use process.

The existing caster (see fig. 1) comprises a wheel C and a caster bracket D, wherein the wheel C is arranged between two clamping plates of the caster bracket D, and the wheel C is fixedly connected with the two clamping plates of the caster bracket D through a wheel shaft a and a nut B; the equipment that wheel C and truckle support D were gone on to the screwing up of nut B on current shaft A promptly is the manual work, and the operation of this kind of manual nut B locking of screwing up is wasted time and energy, and the packaging efficiency is low, consequently the urgent need research and development a section can the frock of auto-lock shaft.

Disclosure of Invention

1. Technical problem to be solved by the utility model

An object of the utility model is to provide a locking frock of automatic lock truckle upper axle, adopt the technical scheme of the utility model, simple structure, it is convenient to connect, can automatic lock truckle upper axle, labour saving and time saving, truckle packaging efficiency is high.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a locking tool for automatically locking the upper wheel shaft of a caster, which comprises a first sleeve and a second sleeve, wherein the first sleeve can not rotate relatively after being spliced with the head of the wheel shaft, and the second sleeve can not rotate relatively after being spliced with a nut on the wheel shaft; the second sleeve is controlled by a nut locking mechanism fixed on a transverse plate of the lifting frame to move and rotate along the left-right direction; the vertical plate of the lifting frame is connected with the vertical plate of the L-shaped main frame through a lifting adjusting mechanism for adjusting the lifting frame according to the height of the caster wheel shaft; the lifting frame is characterized in that a rear baffle which is matched with a lifting adjusting mechanism to enable the wheel shaft, the first sleeve and the second sleeve to be coaxially arranged is arranged on the transverse plate of the lifting frame and between the first sleeve and the second sleeve.

Furthermore, a left baffle and a right baffle are fixedly arranged on the transverse plate of the lifting frame and positioned on the left side and the right side of the rear baffle respectively; the blocking part of the left baffle is provided with a second through hole which is used for being in sliding fit with the second sleeve; the blocking part of the right baffle is provided with a first through hole which is in sliding fit with the first sleeve.

Furthermore, the fixing part of the left baffle, the fixing part of the right baffle and the fixing part of the rear baffle are connected with the transverse plate of the lifting frame in a mode that the fixing bolt penetrates through a waist-shaped hole formed in the fixing part and then is screwed into the transverse plate of the lifting frame.

Furthermore, the wheel shaft fixing mechanism comprises a first air cylinder which can stretch out and draw back along the left-right direction, and the first air cylinder is connected with the transverse plate of the lifting frame through a first air cylinder mounting seat; a piston rod of the first cylinder is fixedly connected with one end of a guide block, wherein the guide block is in sliding connection with a first guide sleeve which can be fixedly arranged on a transverse plate of the lifting frame; the other end of the guide block is fixedly connected with one end of the first sleeve; the other end of the first sleeve is provided with a first regular hexagonal hole which is used for being in plug-in fit with the head of the wheel shaft.

Furthermore, the nut locking mechanism comprises a servo motor and a second air cylinder which can stretch out and draw back along the left and right directions, and the second air cylinder is connected with the transverse plate of the lifting frame through a second air cylinder mounting seat; a piston rod of the second cylinder is connected with the motor mounting seat, wherein a guide rod fixedly arranged on the motor mounting seat is in sliding connection with a second guide sleeve fixedly arranged on the transverse plate of the lifting frame; the servo motor is fixedly arranged on the motor mounting seat; an output shaft of the servo motor is fixedly connected with one end of the second sleeve; and a second regular hexagonal hole which is used for being in splicing fit with the regular hexagonal nut is formed in the other end of the second sleeve.

Furthermore, the lifting adjusting mechanism comprises an adjusting screw rod and an adjusting nut, and the upper end and the lower end of the adjusting screw rod are respectively and rotatably supported on the two supporting blocks on the back surface of the vertical plate of the L-shaped main frame; the adjusting screw rod is in threaded connection with an adjusting nut fixedly arranged on the back of the vertical plate of the lifting frame; the sliding block on the back of the vertical plate of the lifting frame can slidably penetrate through the sliding groove formed in the vertical plate of the L-shaped main frame.

Furthermore, a plurality of threaded holes are uniformly distributed on the sliding block along the length direction of the sliding block; a bolt support frame is arranged on the back surface of the vertical plate of the L-shaped main frame at the sliding groove; the sliding block is fixedly connected with the vertical plate of the L-shaped main frame in a mode that the locking bolt penetrates through the through hole in the bolt support frame and then is screwed into the threaded hole.

Furthermore, the top of the adjusting screw is fixedly connected with a hand wheel turntable.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:

(1) the utility model discloses a locking frock of automatic lock truckle upper axle, its simple structure, it is convenient to connect, can material loading truckle after adjusting the position of crane, backplate, left baffle and right baffle, can ensure the coaxial setting of shaft on the truckle and first sleeve and second sleeve three, quick location truckle, then control shaft fixed establishment and nut locking mechanism work, can accomplish automatic lock truckle upper axle, labour saving and time saving;

(2) the utility model discloses a locking frock of automatic lock truckle upper axle, its shaft fixed establishment simple structure, it is convenient to connect, and first cylinder drives the first sleeve through the guide block and moves about, and the guide block is connected with first uide bushing slip, moves about playing the guide effect to the first sleeve;

(3) the utility model discloses a locking frock of automatic lock truckle upper axle, its nut locking mechanism simple structure, it is convenient to connect, and the second cylinder drives servo motor through the motor mount pad and moves about, and servo motor drives the second sleeve rotation, and the guide bar is connected with second uide bushing slip, moves about to play the guide effect to servo motor;

(4) the utility model discloses a locking frock of automatic locking truckle upper axle, its lift adjustment mechanism simple structure, it is convenient to connect, drives adjusting screw through rotatory hand wheel carousel and rotates, and then drives the crane through adjusting nut and reciprocate, realizes the purpose of regulation, and the sliding block at the vertical board back of crane passes the spout that sets up on the vertical board of L shape body frame slidably, reciprocates to the crane and plays the guide effect;

(5) the utility model discloses an automatic lock locking frock of truckle upper shaft, it has a plurality of screw holes along its length direction equipartition on its sliding block, the vertical board back of body frame that appears is located spout department and is provided with the bolt support frame, the mode of twisting the screw hole after passing the bolt support frame upper through-hole through the locking bolt between the vertical board of sliding block and L shape body frame links firmly, moreover, the steam generator is simple in structure, and convenient for connection, after lifting adjusting mechanism adjusts the crane in place, the mode of twisting the screw hole after passing the bolt support frame upper through-hole through the locking bolt makes crane and L shape body frame link firmly, guarantee that crane position control after-fixing is motionless.

Drawings

FIG. 1 is a schematic structural view of a conventional caster;

fig. 2 is a structural schematic diagram of a first view angle of a locking tool for automatically locking an upper wheel shaft of a caster of the present invention;

fig. 3 is a schematic structural view of a second locking tool viewing angle of the wheel axle on the automatic locking caster of the present invention;

fig. 4 is a schematic structural view of a nut locking mechanism in the locking tool for automatically locking the upper axle of the caster of the present invention;

fig. 5 is a schematic structural view of a wheel axle fixing mechanism in the locking tool for automatically locking the wheel axle on the caster of the present invention;

fig. 6 is the utility model discloses an installation schematic diagram of backplate, left baffle and right baffle in the locking frock of automatic lock truckle upper axle.

The reference numerals in the schematic drawings illustrate: 1. a first sleeve; 1-1, a first regular hexagonal hole; 2. a second sleeve; 2-1, a second regular hexagonal hole; 3. a lifting frame; 4. an L-shaped main frame; 4-1, a chute; 5. a tailgate; 6. a left baffle; 7. a right baffle; 8. fixing the bolt; 9. a first cylinder; 10. a first cylinder mount; 11. a guide block; 12. a first guide sleeve; 13. a servo motor; 14. a second cylinder; 15. a second cylinder mount; 16. a motor mounting seat; 17. a guide bar; 18. a second guide sleeve; 19. adjusting the screw rod; 20. adjusting the nut; 21. a support block; 22. a slider; 22-1, a threaded hole; 23. a bolt support frame; 24. locking the bolt; 25. a handwheel turntable; A. a wheel axle; B. a nut; C. a wheel; D. a caster wheel bracket.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Examples

With reference to fig. 2, the locking tool for automatically locking the upper axle of the caster comprises a lifting frame 3, an L-shaped main frame 4, a first sleeve 1 which is used for being plugged with the head of the axle a and cannot rotate relatively, and a second sleeve 2 which is used for being plugged with the nut B on the axle a and cannot rotate relatively, wherein the lifting frame 3 is composed of a transverse plate, a vertical plate and a reinforcing plate which is connected with the transverse plate and the vertical plate, and a first U-shaped groove is formed in the transverse plate of the lifting frame 3; the L-shaped main frame 4 consists of a transverse plate and a vertical plate, wherein a second U-shaped groove is formed in the transverse plate of the L-shaped main frame 4 at the position corresponding to the first U-shaped groove;

continuing and combining with the figure 5, the first sleeve 1 is controlled by a wheel axle fixing mechanism fixed on a transverse plate of the lifting frame 3 to move along the left and right directions; the wheel shaft fixing mechanism comprises a first air cylinder 9 which can stretch out and draw back along the left-right direction, and the first air cylinder 9 is connected with a transverse plate of the lifting frame 3 through a first air cylinder mounting seat 10; a piston rod of the first air cylinder 9 is fixedly connected with one end of a guide block 11, wherein the guide block 11 is in sliding connection with a first guide sleeve 12 which can be fixedly arranged on a transverse plate of the lifting frame 3; the other end of the guide block 11 is fixedly connected with one end of the first sleeve 1, wherein the guide block 11 is fixedly connected with the first sleeve 1 in a manner that a square block on the guide block 11 is fixedly inserted into an upper hole of the first sleeve 1; the other end of the first sleeve 1 is provided with a first regular hexagonal hole 1-1 which is used for being in inserting fit with the regular hexagonal head of the wheel axle A; the wheel shaft fixing mechanism is simple in structure and convenient to connect, the first cylinder drives the first sleeve to move left and right through the guide block, and the guide block is connected with the first guide sleeve in a sliding mode and plays a role in guiding the first sleeve to move left and right;

continuing and combining with the figure 4, the second sleeve 2 is controlled by a nut locking mechanism fixed on a transverse plate of the lifting frame 3 to move and rotate along the left and right directions; the nut locking mechanism comprises a servo motor 13 and a second air cylinder 14 which can stretch out and draw back along the left and right directions, and the second air cylinder 14 is connected with the transverse plate of the lifting frame 3 through a second air cylinder mounting seat 15; a piston rod of the second air cylinder 14 is connected with a motor mounting seat 16, wherein a guide rod 17 fixedly arranged on the motor mounting seat 16 is in sliding connection with a second guide sleeve 18 fixedly arranged on a transverse plate of the lifting frame 3; the servo motor 13 is fixedly arranged on the motor mounting base 16; an output shaft of the servo motor 13 is fixedly connected with one end of the second sleeve 2, wherein the output shaft of the servo motor 13 is fixedly connected with the second sleeve 2 in a manner that an upper square block of the output shaft of the servo motor 13 is fixedly inserted into a hole above the second sleeve 2; the other end of the second sleeve 2 is provided with a second regular hexagonal hole 2-1 which is used for being in splicing fit with the nut B; the nut locking mechanism is simple in structure and convenient to connect, the second cylinder drives the servo motor to move left and right through the motor mounting seat, the servo motor drives the second sleeve to rotate, and the guide rod is connected with the second guide sleeve in a sliding mode and plays a role in guiding the servo motor to move left and right;

continuing with fig. 4, in the present embodiment: the second cylinder mounting seat 15 comprises a connecting transverse plate fixedly connected with the transverse plate of the lifting frame 3, and a first connecting vertical plate and a second connecting vertical plate vertically and fixedly arranged on the connecting transverse plate, the second cylinder 14 is fixedly arranged on the first connecting vertical plate, and a piston rod of the second cylinder 14 can move left and right and penetrates through the first connecting vertical plate to be connected with a motor mounting seat 16 positioned between the first connecting vertical plate and the second connecting vertical plate; the motor mounting base 16 comprises a U-shaped frame and a motor mounting plate connected with two side arms on the U-shaped frame, a middle connecting rod on the U-shaped frame is fixedly connected with a piston rod of the second air cylinder 14, the servo motor 13 is positioned between the two side arms on the U-shaped frame, the servo motor 13 is fixed on the motor mounting plate, an output shaft of the servo motor 13 penetrates through the motor mounting plate and then is fixedly connected with the second sleeve 2, guide rods 17 are fixedly arranged at the front end and the rear end of the motor mounting plate, and the two guide rods 17 are respectively in sliding connection with two second guide sleeves 18 which are processed on a second connecting vertical plate and are positioned at the front side and the rear side of the output shaft of the servo motor 13;

continuing and combining with the figure 3, the vertical plate of the lifting frame 3 is connected with the vertical plate of the L-shaped main frame 4 through a lifting adjusting mechanism for adjusting the height of the lifting frame 3 according to the upper wheel axle A of the caster wheel; the lifting adjusting mechanism comprises an adjusting screw rod 19 and an adjusting nut 20, and the top of the adjusting screw rod 19 is fixedly connected with a hand wheel turntable 25; the upper end and the lower end of the adjusting screw rod 19 are respectively and rotatably supported on two supporting blocks 21 on the back surface of the vertical plate of the L-shaped main frame 4; the adjusting screw rod 19 is in threaded connection with an adjusting nut 20 fixedly arranged on the back of the vertical plate of the lifting frame 3; a sliding block 22 on the back of the vertical plate of the lifting frame 3 can slidably pass through a sliding groove 4-1 formed in the vertical plate of the L-shaped main frame 4; the lifting adjusting mechanism is simple in structure and convenient to connect, the adjusting screw rod is driven to rotate by rotating the hand wheel turntable, and the lifting frame is driven to move up and down by the adjusting nut, so that the purpose of adjustment is realized, and the sliding block on the back of the vertical plate of the lifting frame slidably penetrates through the sliding groove formed in the vertical plate of the L-shaped main frame to guide the lifting frame to move up and down;

continuing to fig. 3, in order to ensure that the lifting frame is fixed after the position is adjusted, a plurality of threaded holes 22-1 are uniformly distributed on the sliding block 22 along the length direction; a bolt support frame 23 is arranged on the back surface of the vertical plate of the L-shaped main frame 4 at the position of the sliding groove 4-1; the sliding block 22 is fixedly connected with the vertical plate of the L-shaped main frame 1 in a way that a locking bolt 24 penetrates through a through hole on the bolt support frame 23 and then is screwed into a threaded hole 22-1; after the lifting frame is adjusted in place by the lifting adjusting mechanism, the lifting frame is fixedly connected with the L-shaped main frame in a mode that the locking bolt penetrates through the through hole on the bolt supporting frame and then is screwed into the threaded hole;

continuing and combining with fig. 6, a rear baffle 5 which is matched with a lifting adjusting mechanism to enable the axle a, the first sleeve 1 and the second sleeve 2 to be coaxially arranged is arranged on the transverse plate of the lifting frame 3 and between the first sleeve 1 and the second sleeve 2, and a blocking part of the rear baffle 5 is in a V shape; a left baffle 6 and a right baffle 7 are respectively and fixedly arranged on the transverse plate of the lifting frame 3 and positioned on the left side and the right side of the rear baffle 5, wherein the left baffle 6 and the right baffle 7 are both L-shaped; a blocking part of the left baffle 6 is provided with a second through hole which is used for sliding matching with the second sleeve 2; a first through hole which is matched with the first sleeve 1 in a sliding way is formed in the blocking part of the right baffle 7; in order to adjust the positions of the rear baffle 5, the left baffle 6 and the right baffle 7 as required, the fixing part of the left baffle 6, the fixing part of the right baffle 7, the fixing part of the rear baffle 5 and the transverse plate of the lifting frame 3 are connected in a way that the fixing bolt 8 penetrates through a waist-shaped hole formed in the fixing part and then is screwed into the transverse plate of the lifting frame 3; specifically, the fixing portion of the left baffle 6 is disposed at the left side edge of the first U-shaped groove, the fixing portion of the right baffle 7 is disposed at the right side edge of the first U-shaped groove, and the fixing portion of the rear baffle 5 is disposed at the rear side edge of the first U-shaped groove.

The tool operation steps are as follows:

1) the whole tool is fixed on an operation table, the vertical position of a lifting frame is adjusted through a lifting adjusting mechanism according to the height position of a rear axle of a caster to be locked during feeding, and meanwhile, the front and rear positions of a rear baffle are adjusted through a waist-shaped hole in a rear baffle fixing part, so that the axle, a first sleeve and a second sleeve are coaxially arranged; according to the length of the wheel shaft on the caster to be locked, the left and right positions of the left baffle and the right baffle are adjusted through the waist-shaped holes on the left baffle and the right baffle, so that the wheel shaft is just positioned between the blocking part of the left baffle and the blocking part of the right baffle;

2) manually feeding the caster to be locked onto the operating platform, wherein the caster is positioned at the second U-shaped groove, the side edge of the mounting plate of the caster bracket is abutted against the side edge of the second U-shaped groove, the wheel is abutted against the blocking part of the rear baffle, the wheel shaft is positioned between the blocking part of the left baffle and the blocking part of the right baffle, and the wheel shaft, the first sleeve and the second sleeve are coaxially arranged;

3) the first cylinder and the second cylinder are controlled to work, so that the first sleeve is connected with the head of the wheel shaft in an inserting mode, the second sleeve is connected with the nut on the wheel shaft in an inserting mode, the tail of the wheel shaft is inserted into the second sleeve, and the head of the wheel shaft and the nut are regular hexagons, so that the first sleeve can move left and right relatively but cannot rotate relatively after being connected with the head of the wheel shaft in an inserting mode and the second sleeve is connected with the nut on the wheel shaft in an inserting mode;

4) the servo motor is controlled to work, so that the second sleeve can drive the nut to rotate, and the nut is in threaded connection with the wheel shaft, and the first sleeve and the head of the wheel shaft can move left and right relatively but cannot rotate relatively, so that when the second sleeve drives the nut to rotate on the wheel shaft, the head of the wheel shaft can be slowly separated from the first sleeve, and the tail of the wheel shaft can be slowly inserted into the second sleeve; and continuously controlling the servo motor to work until the assembly of the wheel and the caster wheel bracket is completed.

The utility model discloses a locking frock of automatic lock truckle upper axle, simple structure, it is convenient to connect, can automatic lock truckle upper axle, labour saving and time saving, the truckle packaging efficiency is high.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides an automatic lock locking frock of shaft on truckle, its characterized in that: the device comprises a first sleeve (1) which cannot rotate relatively after being spliced with the head of a wheel shaft (A) and a second sleeve (2) which cannot rotate relatively after being spliced with a nut (B) on the wheel shaft (A), wherein the first sleeve (1) is controlled by a wheel shaft fixing mechanism fixed on a transverse plate of a lifting frame (3) to move along the left-right direction; the second sleeve (2) is controlled by a nut locking mechanism fixed on a transverse plate of the lifting frame (3) to move and rotate along the left-right direction; the vertical plate of the lifting frame (3) is connected with the vertical plate of the L-shaped main frame (4) through a lifting adjusting mechanism for adjusting the height of the lifting frame (3) according to the height of the caster wheel upper axle (A); the lifting frame (3) is provided with a rear baffle (5) which is matched with a lifting adjusting mechanism to use and enables the axle (A), the first sleeve (1) and the second sleeve (2) to be coaxially arranged on a transverse plate and located between the first sleeve (1) and the second sleeve (2).

2. The locking tool for automatically locking the upper wheel shaft of the caster as claimed in claim 1, wherein: a left baffle (6) and a right baffle (7) are respectively and fixedly arranged on the transverse plate of the lifting frame (3) and positioned at the left side and the right side of the rear baffle (5); a blocking part of the left baffle (6) is provided with a second through hole which is used for being in sliding fit with the second sleeve (2); the blocking part of the right blocking plate (7) is provided with a first through hole which is in sliding fit with the first sleeve (1).

3. The locking tool for automatically locking the upper wheel shaft of the caster as claimed in claim 2, wherein: the fixed part of left baffle (6), the fixed part of right baffle (7) and the fixed part of backplate (5) and the horizontal board of crane (3) between all pass through the mode of screw in crane (3) horizontal inboard behind the waist shape hole of seting up on the fixed part through fixing bolt (8) and link to each other.

4. The locking tool for automatically locking the upper wheel shaft of the caster as claimed in claim 1, wherein: the wheel shaft fixing mechanism comprises a first air cylinder (9) capable of stretching along the left-right direction, and the first air cylinder (9) is connected with a transverse plate of the lifting frame (3) through a first air cylinder mounting seat (10); a piston rod of the first cylinder (9) is fixedly connected with one end of a guide block (11), wherein the guide block (11) is in sliding connection with a first guide sleeve (12) which can be fixedly arranged on a transverse plate of the lifting frame (3); the other end of the guide block (11) is fixedly connected with one end of the first sleeve (1); the other end of the first sleeve (1) is provided with a first regular hexagonal hole (1-1) which is used for being in plug-in fit with the head of the wheel shaft (A).

5. The locking tool for automatically locking the upper wheel shaft of the caster as claimed in claim 1, wherein: the nut locking mechanism comprises a servo motor (13) and a second air cylinder (14) capable of stretching along the left-right direction, and the second air cylinder (14) is connected with the transverse plate of the lifting frame (3) through a second air cylinder mounting seat (15); a piston rod of the second cylinder (14) is connected with a motor mounting seat (16), wherein a guide rod (17) fixedly arranged on the motor mounting seat (16) is in sliding connection with a second guide sleeve (18) fixedly arranged on a transverse plate of the lifting frame (3); the servo motor (13) is fixedly arranged on the motor mounting seat (16); an output shaft of the servo motor (13) is fixedly connected with one end of the second sleeve (2); the other end of the second sleeve (2) is provided with a second regular hexagonal hole (2-1) which is used for being in plug-in fit with the nut (B).

6. The locking tool for automatically locking the upper wheel shaft of the caster as claimed in claim 1, wherein: the lifting adjusting mechanism comprises an adjusting screw rod (19) and an adjusting nut (20), wherein the upper end and the lower end of the adjusting screw rod (19) are respectively and rotatably supported on two supporting blocks (21) on the back surface of the vertical plate of the L-shaped main frame (4); the adjusting screw rod (19) is in threaded connection with an adjusting nut (20) fixedly arranged on the back of the vertical plate of the lifting frame (3); the sliding block (22) on the back of the vertical plate of the lifting frame (3) can slidably penetrate through a sliding groove (4-1) formed in the vertical plate of the L-shaped main frame (4).

7. The locking tool for automatically locking the upper wheel shaft of the caster as claimed in claim 6, wherein: a plurality of threaded holes (22-1) are uniformly distributed on the sliding block (22) along the length direction; a bolt support frame (23) is arranged on the back surface of the vertical plate of the L-shaped main frame (4) at the position of the sliding chute (4-1); the sliding block (22) is fixedly connected with the vertical plate of the L-shaped main frame (4) in a mode that a locking bolt (24) penetrates through a through hole in the bolt supporting frame (23) and then is screwed into the threaded hole (22-1).

8. The locking tool for automatically locking the upper wheel shaft of the caster as claimed in claim 6, wherein: the top of the adjusting screw rod (19) is fixedly connected with a hand wheel turntable (25).

Images