CN111791933A

CN111791933A - Can realize dead engineering shallow of reverse lock of uphill wheel

Info

Publication number: CN111791933A
Application number: CN202010751452.9A
Authority: CN
Inventors: 苏欢
Original assignee: Hangzhou Jiande Ruixi Electronic Technology Co ltd
Current assignee: Hangzhou Jiande Ruixi Electronic Technology Co ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2020-10-20

Abstract

The engineering cart capable of realizing reverse locking of wheels on an uphill slope comprises a cart body, wherein a loading cavity with an upward opening is formed in the cart body, the unidirectional rotation of the wheels is realized through a unidirectional locking device, the independence of unidirectional locking and unlocking of the wheels is realized through a push rod mechanism and a clamping block mechanism, the unidirectional movement of the wheels is beneficial to preventing the cart from sliding on the uphill slope, the cart can be stopped at any time and any place without repeated operation, the workload of operators is reduced, and the effects of labor saving and safety are realized.

Description

Can realize dead engineering shallow of reverse lock of uphill wheel

Technical Field

The invention relates to the field of engineering equipment, in particular to an engineering trolley capable of realizing reverse locking of wheels on an uphill slope.

Background

In construction at a worksite, it is often necessary to haul many construction materials, which often require a construction cart.

Most of traditional engineering carts can only realize simple back-and-forth movement, and in a working environment that workers use the engineering carts to ascend slopes, because of component force of gravity of the carts along the ground direction, the workers can consume more physical power to control the carts to slide downwards, so that the workers can feel tired faster and have a cart landslide caused by insufficient physical power of the workers, and potential safety hazards exist.

Disclosure of Invention

The technical problem is as follows: most of the traditional engineering carts can only realize simple front-back movement, and when the engineering carts go up a slope, the engineering carts are subjected to component force of self gravity along the ground direction, so that the landslide phenomenon is easy to happen, and potential safety hazards exist.

In order to solve the problems, the engineering cart capable of realizing reverse locking of the wheels on the uphill road is designed in the embodiment, the engineering cart capable of realizing reverse locking of the wheels on the uphill road comprises a cart body, a carrying cavity with an upward opening is arranged in the cart body, a transmission cavity is arranged on the left side of the carrying cavity, a working cavity which is through from left to right and has a downward opening is arranged on the lower side of the transmission cavity, a bearing plate is fixedly arranged in the transmission cavity, two transmission rods are symmetrically and slidably arranged in the bearing plate in the front and back direction, a first push block is fixedly arranged on the upper end face of each transmission rod, the lower end of each transmission rod extends into the working cavity, the transmission rods are slidably connected with the inner wall of the lower side of the transmission cavity and the inner wall of the upper side of the working cavity, a second push block is fixedly arranged on the lower end face of each transmission rod, a locking device is arranged on the right side, a driven shaft is arranged in the first sliding hole in a left-right sliding manner, two first driven rods are fixedly arranged on the left end face of the driven shaft relative to the corresponding positions of the two transmission rods, a third push block is fixedly arranged at the left end of each first driven rod and is in abutting connection with the second push block, a first fixed baffle is fixedly arranged on each first driven rod, left bearing plates are fixedly arranged on the front inner wall and the rear inner wall of the working cavity, right bearing plates are fixedly arranged on the front inner wall and the rear inner wall of the working cavity, the right bearing plate is positioned on the right side of the left bearing plate, the first driven rods are in sliding connection with the left bearing plate and the right bearing plate, the first fixed baffle is positioned between the left bearing plate and the right bearing plate, a first spring is fixedly arranged between the first fixed baffle and the right bearing plate, a wheel shaft is arranged in the working cavity in a through and rotating manner from front to back, two wheels which are symmetrical from front to back are fixedly arranged on the wheel shaft, the automobile wheel is located on the outer side of the front end face and the rear end face of the automobile body, a brake device is arranged on an axle of the automobile wheel, two push handles are fixedly arranged at the positions, corresponding to the transmission rod, of the left end face of the automobile body, a control cavity communicated with the inner wall of the right side of the transmission cavity is arranged in each push handle, a control device is arranged in each control cavity, and supporting legs are fixedly arranged on the lower end faces of the push handles.

Wherein the locking device also comprises a locking gear fixedly arranged on the driven shaft, a locking wheel fixedly arranged on the wheel shaft is arranged on the right side of the locking gear, a second sliding hole with an upward opening is annularly arrayed in the locking wheel, a locking block is arranged in the second sliding hole in a sliding connection manner, a second spring is fixedly arranged between the end surface of the locking block close to the central side of the annular array and the inner wall of the second slide hole close to the central side of the annular array, when the driven shaft moves rightwards, the dead lock gear can be driven to abut against the dead lock block, the dead lock block slides with the dead lock gear when the dead lock wheel rotates clockwise, the dead lock block is meshed with the dead lock gear when the dead lock wheel rotates anticlockwise, because the dead lock gear can not rotate, the counterclockwise rotation of the dead lock wheel is limited, and the reverse self-locking of the wheel shaft is realized.

Wherein, the brake device comprises two brake pads which are symmetrically and fixedly arranged on the wheel shaft in the front and back direction, two left fixing plates which are respectively and fixedly arranged on the front and back inner walls of the working cavity are symmetrically and arranged in the front and back direction in the working cavity, two right fixing plates which are respectively and fixedly arranged on the front and back inner walls of the working cavity are symmetrically and arranged in the front and back direction in the working cavity, a first rotating shaft is arranged between the left fixing plate and the right fixing plate in a rotating way by a torsion spring, a crank rod is fixedly arranged on the first rotating shaft, the end surface of the crank rod, which is close to the side of the symmetrical center, is fixedly provided with a brake block, the end surface of the crank rod, which is far away from the symmetrical center, is fixedly provided with a pull rope, the side of the crank rod, which is far away from the symmetrical center, is provided with a first fixing sleeve, the first, when the brake is carried out, the side end face of the brake block close to the symmetric center is contacted with the side end face of the brake block far from the symmetric center, and the brake is realized by utilizing friction force.

Wherein, the control device comprises a bearing baffle fixedly arranged in the control cavity, a push rod is arranged in the bearing baffle in a sliding connection manner, the left end of the push rod extends to the outer side of the left end face of the push handle, a fourth push block is fixedly arranged on the right end face of the push rod, the fourth push block is in abutting connection with the first push block at a corresponding position, a second fixed baffle is fixedly arranged on the push rod, the second fixed baffle is positioned on the right side of the bearing baffle, a third spring is fixedly arranged between the second fixed baffle and the bearing baffle, a second fixed sleeve is fixedly arranged on the push rod, the second fixed sleeve is positioned on the left side of the bearing baffle, a second rotating shaft is rotated after the second fixed sleeve is arranged, a second driven rod is fixedly arranged on the right end face of the second rotating shaft, and a clamping block is fixedly arranged on the right end face of the second driven rod, a fourth spring is fixedly arranged between the lower end face of the clamping block and the upper end face of the push rod, a clamping hole is formed in the inner wall of the upper side of the control cavity in a penetrating manner, the clamping hole is positioned on the right side of the clamping block, when the second driven rod moves rightwards, the clamping block can be clamped in the clamping hole, a fixed plate is fixedly arranged on the end face of the push handle close to the side of the symmetry center, a fixed shaft is fixedly arranged on the fixed plate, a brake handle is rotatably arranged on the fixed shaft, a brake spring is fixedly arranged between the upper end face of the brake handle and the lower end face of the push handle, a third fixed sleeve is fixedly arranged in the inner wall of the lower side of the control cavity in a penetrating manner, a third fixed sleeve is fixedly arranged in the third fixed sleeve, the other end of the threading pipe penetrates out of the other end of the threading pipe and is fixedly connected with the upper end face of the, the mantle fiber pipe passes the through wires hole, control chamber downside inner wall the automobile body left end face and front and back terminal surface are fixed and are equipped with the solid fixed ring of a plurality of, the mantle fiber pipe is followed pass in the solid fixed ring, it is right to realize the direction and the fixing of mantle fiber pipe.

The invention has the beneficial effects that: the invention realizes the unidirectional rotation of the wheels through the unidirectional locking device, realizes the independence of unidirectional locking and unlocking of the wheels through the push rod mechanism and the fixture block mechanism, ensures that the cart does not slide on an uphill slope due to the unidirectional movement of the wheels, can be stopped at any time and any place without repeated operation, reduces the workload of operators, realizes the effects of labor saving and safety, and is also provided with the brake system to help the operators to better control the speed of the cart so as to further ensure the safety.

Drawings

For ease of illustration, the invention is described in detail by the following specific examples and figures.

Fig. 1 is a schematic overall structure diagram of an engineering cart capable of realizing reverse locking of wheels on an uphill slope according to the invention;

FIG. 2 is a schematic view of the structure in the direction "A-A" of FIG. 1;

FIG. 3 is a schematic view of the structure in the direction "B-B" of FIG. 2;

FIG. 4 is a schematic view of the structure in the direction "C-C" of FIG. 3;

FIG. 5 is an enlarged schematic view of a portion "D" of FIG. 1;

FIG. 6 is an enlarged schematic view of the "E" portion of FIG. 1;

fig. 7 is an enlarged structural view in the direction "F-F" of fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-7, for ease of description, the orientations described below will now be defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The invention relates to an engineering cart capable of realizing reverse locking of uphill wheels, which is mainly applied to the process of realizing reverse locking of uphill wheels, and the invention is further explained by combining the attached drawings of the invention: the engineering cart capable of realizing reverse locking of wheels on an uphill slope comprises a cart body 27, a loading cavity 32 with an upward opening is arranged in the cart body 27, a transmission cavity 28 is arranged on the left side of the loading cavity 32, a working cavity 36 which is through from left to right and has a downward opening is arranged on the lower side of the transmission cavity 28, a bearing plate 31 is fixedly arranged in the transmission cavity 28, two transmission rods 30 are symmetrically arranged in the bearing plate 31 in a sliding manner in a front-back manner, a first push block 29 is fixedly arranged on the upper end face of each transmission rod 30, the lower end of each transmission rod 30 extends into the corresponding working cavity 36, each transmission rod 30 is connected with the inner wall of the lower side of the transmission cavity 28 and the inner wall of the upper side of the corresponding working cavity 36 in a sliding manner, a second push block 35 is fixedly arranged on the lower end face of each transmission rod 30, a locking device 901 is arranged on the right side of the second push block 35, the locking device 901, a driven shaft 41 can slide left and right in the first sliding hole 44, two first driven rods 33 are fixedly arranged on the left end face of the driven shaft 41 relative to the corresponding positions of the two transmission rods 30, a third push block 34 is fixedly arranged at the left end of the first driven rod 33, the third push block 34 is in abutting connection with the second push block 35, a first fixed baffle 47 is fixedly arranged on the first driven rod 33, a left bearing plate 38 is fixedly arranged on the front and rear inner walls of the working cavity 36, a right bearing plate 39 is fixedly arranged on the front and rear inner walls of the working cavity 36, the right bearing plate 39 is positioned on the right side of the left bearing plate 38, the first driven rod 33 is in sliding connection with the left bearing plate 38 and the right bearing plate 39, the first fixed baffle 47 is positioned between the left bearing plate 38 and the right bearing plate 39, and a first spring 46 is fixedly arranged between the first fixed baffle 47 and the right bearing plate 39, the working cavity 36 is provided with a wheel shaft 42 in a front-back through and rotating mode, two wheels 40 which are symmetrical in front-back are fixedly arranged on the wheel shaft 42, the wheels 40 are located on the outer sides of the front end face and the back end face of the vehicle body 27, the wheel shaft 42 is provided with a brake device 902, two push handles 12 are fixedly arranged at positions, corresponding to the transmission rod 30, of the left end face of the vehicle body 27, a control cavity 18 which is communicated with the inner wall of the right side of the transmission cavity 28 is arranged in each push handle 12, a control device 903 is arranged in each control cavity 18, and supporting legs 11 are fixedly arranged on the.

According to the embodiment, the locking device 901 will be described in detail below, the locking device 901 further includes a locking gear 45 fixedly disposed on the driven shaft 41, a locking wheel 60 fixedly disposed on the wheel shaft 42 is disposed on the right side of the locking gear 45, 10 second sliding holes 59 with upward openings are disposed in the annular array in the locking wheel 60, a locking block 58 is slidably disposed in the second sliding hole 59, a second spring 57 is fixedly disposed between the locking block 58 close to the side end face of the center of the annular array and the inner wall of the second sliding hole 59 close to the side end face of the center of the annular array, when the driven shaft 41 moves to the right, the locking gear 45 is driven to abut against the locking block 58, and when the locking wheel 60 rotates clockwise, the locking block 58 slides with the locking gear 45, when the locking wheel 60 rotates counterclockwise, the locking block 58 engages with the locking gear 45, because the dead lock gear 45 can not rotate, the counterclockwise rotation of the dead lock wheel 60 is limited, and the reverse self-locking of the wheel axle 42 is realized.

According to the embodiment, the brake device 902 will be described in detail below, the brake device 902 includes two brake pads 43 fixed on the wheel axle 42 in a front-back symmetrical manner, two left fixing plates 49 fixed on the front and back inner walls of the working chamber 36 respectively are symmetrically arranged in the front-back symmetrical manner in the working chamber 36, two right fixing plates 61 fixed on the front and back inner walls of the working chamber 36 respectively are symmetrically arranged in the front-back symmetrical manner in the working chamber 36, a first rotating shaft 50 is rotatably arranged between the left fixing plates 49 and the right fixing plates 61, a curved rod 51 is fixedly arranged on the first rotating shaft 50, a brake block 52 is fixedly arranged on the end surface of the curved rod 51 close to the symmetrical center, a pull rope 55 is fixedly arranged on the end surface of the curved rod 51 far from the symmetrical center, a first fixing sleeve 62 is arranged on the side of the curved rod 51 far from the symmetrical center, the first fixing sleeves 62 are respectively penetrated and fixedly arranged in the front and back walls of the working, the first fixing sleeve 62 is internally fixed with a sleeve pipe 48, the pull rope 55 is slidably arranged in the sleeve pipe 48, when braking, the brake block 52 is close to the end face of the side of the symmetric center and the brake block 43 is far away from the end face of the side of the symmetric center, and braking is realized by using friction force.

According to the embodiment, the control device 903 is described in detail below, the control device 903 includes a bearing baffle 23 fixedly disposed in the control cavity 18, a push rod 17 is slidably disposed in the bearing baffle 23, a left end of the push rod 17 extends to an outer side of a left end surface of the push handle 12, a fourth push block 26 is fixedly disposed on a right end surface of the push rod 17, the fourth push block 26 is connected to the first push block 29 in an abutting manner, a second fixing baffle 25 is fixedly disposed on the push rod 17, the second fixing baffle 25 is located on a right side of the bearing baffle 23, a third spring 24 is fixedly disposed between the second fixing baffle 25 and the bearing baffle 23, a second fixing sleeve 19 is fixedly disposed on the push rod 17, the second fixing sleeve 19 is located on a left side of the bearing baffle 23, the second fixing sleeve 19 rotates and is provided with a second rotating shaft 20 in a penetrating manner, the right end face of the second rotating shaft 20 is fixedly provided with a second driven rod 21, the right end face of the second driven rod 21 is fixedly provided with a clamping block 54, a fourth spring 53 is fixedly arranged between the lower end face of the clamping block 54 and the upper end face of the push rod 17, the inner wall of the upper side of the control cavity 18 is provided with a clamping hole 63 in a penetrating manner, the clamping hole 63 is positioned on the right side of the clamping block 54, when the second driven rod 21 moves rightwards, the clamping block 54 can be clamped in the clamping hole 63, the push handle 12 is fixedly provided with a fixing plate 13 close to the end face of the side of the symmetric center, the fixing plate 13 is fixedly provided with a fixing shaft 14, the fixing shaft 14 is rotatably provided with a brake handle 15, a brake spring 16 is fixedly arranged between the upper end face of the brake handle 15 and the lower end face of the push handle 12, the inner wall of the lower side of the control cavity 18 is provided with a third fixing sleeve, the other end of stay cord 55 is followed bushing pipe 48 other end wear out and with 15 up end fixed connection of brake lever, control chamber 18 downside inner wall link up and is equipped with through wires hole 37, through wires hole 37 is located the third fixed sleeve 56 right side, bushing pipe 48 passes through wires hole 37, control chamber 18 downside inner wall vehicle body 27 left end face and front and back terminal surface are fixed and are equipped with the solid fixed ring 22 of a plurality of, bushing pipe 48 is followed pass in the solid fixed ring 22, it is right to realize bushing pipe 48's direction and fixed.

The following describes in detail the use steps of a work cart capable of achieving reverse locking of uphill wheels, with reference to fig. 1 to 7: initially, the push rod 17 extends out of the push handle 12 for a certain distance, the latch 54 is located in the control cavity 18 and is abutted against the inner wall of the upper side of the control cavity 18 under the influence of the elastic force of the fourth spring 53, the third spring 24 has no elastic potential energy, the brake handle 15 has a downward left end under the influence of the elastic force of the brake spring 16 and an upward right end kept at a short distance from the third fixed sleeve 56, the first spring 46 has no elastic potential energy, the driven shaft 41 is located at the left side in the first sliding hole 44, the locking gear 45 is kept at a certain distance from the locking wheel 60, the curved rod 51 is kept at a certain angle, the brake block 52 is not contacted with the brake pad 43, the side end face of the curved rod 51 far away from the symmetric center keeps a long distance from the front inner wall and the rear inner wall of the working cavity 36, the locking block 58 is located in the; when the self-locking is performed reversely, the push rod 17 is pushed into the control cavity 18, the push rod 17 moves rightwards to drive the second fixed sleeve 19, the second rotating shaft 20, the second driven rod 21, the fixture block 54 and the fourth spring 53 to move rightwards until the fixture block 54 is clamped into the clamping hole 63 under the influence of the elastic force of the fourth spring 53, the push rod 17 moves rightwards to drive the second fixed baffle 25 and the fourth push block 26 to move rightwards, the elastic potential energy of the third spring 24 is accumulated, the fourth push block 26 moves rightwards to drive the first push block 29 to move downwards, the first push block 29 moves downwards to drive the transmission rod 30 and the second push block 35 to move downwards, the second push block 35 moves downwards to drive the third push block 34 to move rightwards, the third push block 34 moves rightwards to drive the first driven rod 33, the first fixed baffle 47 and the driven shaft 41 to move rightwards, the first spring 46 accumulates the elastic potential energy, the right movement of the driven shaft 41 drives the dead-locking gear 45 to move rightwards to abut against the dead lock block 58, and the dead lock block 58 and the dead gear 45 slide clockwise when the dead, when the locking wheel 60 rotates anticlockwise, the locking block 58 is meshed with the locking gear 45, and the locking gear 45 cannot rotate, so that the anticlockwise rotation of the locking wheel 60 is limited, and the reverse self-locking of the wheel shaft 42 is realized; when the self-locking is released, the fixture block 54 is pressed into the control cavity 18, and is released by the elastic potential energy of the third spring 24 and the first spring 46, the push rod 17 moves to the left to the initial position, so as to drive the second fixing sleeve 19, the second rotating shaft 20, the second driven rod 21, the fixture block 54, the second fixing baffle 25 and the fourth push block 26 to move to the left to the initial position, the first push block 29 loses the thrust of the fourth push block 26 and moves back to the initial position, so as to drive the transmission rod 30 and the second push block 35 to move up, the third push block 34 loses the thrust of the working cavity 36 and the elastic action of the first spring 46 and moves back to the initial position, so as to drive the driven shaft 41 to move to the initial position to the left, and the dead-locking gear 45 and the dead-locking wheel 60 keep the; when braking, the brake handle 15 is pressed upwards, the elastic potential energy of the brake spring 16 is accumulated, the brake handle 15 rotates clockwise around the fixed shaft 14, so that the right end of the brake handle 15 moves downwards, the pull rope 55 is pulled to slide in the loop wire pipe 48, the other end of the pull rope 55 is fixedly connected with the curved rod 51, the curved rod 51 is driven to rotate around the first rotating shaft 50 to the side close to the symmetrical center, the brake block 52 is in contact with the brake pad 43, and braking is realized through the friction force of the brake block 52 and the brake pad 43; when the brake is released, the brake handle 15 is loosened, the elastic potential energy of the brake spring 16 is released, the brake handle 15 rotates anticlockwise around the fixed shaft 14 to return to the initial position, the first rotating shaft 50 drives the curved rod 51 to rotate towards the side far away from the symmetric center under the action of the elastic force of the torsion spring, the curved rod 51 pulls the pull rope 55 to slide in the sleeve wire pipe 48 to return to the initial position, and the brake block 52 and the brake pad 43 lose friction, so that the brake is released.

In the above manner, a person skilled in the art can make various changes depending on the operation mode within the scope of the present invention.

Claims

1. The utility model provides a can realize dead engineering shallow of uphill wheel reverse lock, includes the automobile body, be equipped with the ascending year thing chamber of opening in the automobile body, its characterized in that: a transmission cavity is arranged on the left side of the loading cavity, a working cavity which is through from left to right and has a downward opening is arranged on the lower side of the transmission cavity, a bearing plate is fixedly arranged in the transmission cavity, two transmission rods are symmetrically and slidably arranged in the bearing plate from front to back, a first push block is fixedly arranged on the upper end face of each transmission rod, the lower end of each transmission rod extends into the working cavity, the transmission rods are slidably connected with the inner wall of the lower side of the transmission cavity and the inner wall of the upper side of the working cavity, a second push block is fixedly arranged on the lower end face of each transmission rod, and a locking device is arranged; the locking device comprises a first sliding hole which is arranged on the front inner wall and the rear inner wall of the working cavity in a penetrating way, a driven shaft is arranged in the first sliding hole in a left-right sliding way, two first driven rods are fixedly arranged on the left end surface of the driven shaft at corresponding positions of the two driving rods, a third push block is fixedly arranged at the left end of the first driven rod and is in abutting connection with the second push block, a first fixed baffle is fixedly arranged on the first driven rod, a left bearing shaft plate is fixedly arranged on the front inner wall and the rear inner wall of the working cavity, the front inner wall and the rear inner wall of the working cavity are fixedly provided with a right bearing shaft plate which is positioned at the right side of the left bearing shaft plate, the first driven rod is connected with the left bearing shaft plate and the right bearing shaft plate in a sliding mode, the first fixed baffle is located between the left bearing shaft plate and the right bearing shaft plate, and a first spring is fixedly arranged between the first fixed baffle and the right bearing shaft plate; the working cavity is communicated with a wheel shaft in a front-back rotating mode, two wheels which are symmetrical in the front-back mode are fixedly arranged on the wheel shaft, the wheels are located on the outer sides of the front end face and the rear end face of the vehicle body, a brake device is arranged on the wheel shaft, two push handles are fixedly arranged at the positions, corresponding to the transmission rod, of the left end face of the vehicle body, a control cavity communicated with the inner wall of the right side of the transmission cavity is arranged in each push handle, a control device is arranged in each control cavity, and supporting legs are fixedly arranged on.

2. The engineering cart capable of realizing reverse locking of wheels on an uphill slope as claimed in claim 1, wherein: the locking device also comprises a locking gear fixedly arranged on the driven shaft, a locking wheel fixedly arranged on the wheel shaft is arranged on the right side of the locking gear, a second sliding hole with an upward opening is annularly arrayed in the locking wheel, a locking block is arranged in the second sliding hole in a sliding connection manner, a second spring is fixedly arranged between the end surface of the locking block close to the central side of the annular array and the inner wall of the second slide hole close to the central side of the annular array, when the driven shaft moves rightwards, the dead lock gear can be driven to abut against the dead lock block, the dead lock block slides with the dead lock gear when the dead lock wheel rotates clockwise, the dead lock block is meshed with the dead lock gear when the dead lock wheel rotates anticlockwise, because the dead lock gear can not rotate, the counterclockwise rotation of the dead lock wheel is limited, and the reverse self-locking of the wheel shaft is realized.

3. The engineering cart capable of realizing reverse locking of wheels on an uphill slope as claimed in claim 1, wherein: the brake device comprises two brake pads which are symmetrically and fixedly arranged on the wheel shaft in the front-back direction, two left fixing plates which are fixedly arranged on the front inner wall and the rear inner wall of the working cavity respectively are symmetrically and arranged in the front-back direction in the working cavity, two right fixing plates which are fixedly arranged on the front inner wall and the rear inner wall of the working cavity respectively are symmetrically and arranged in the front-back direction in the working cavity respectively, a first rotating shaft is arranged between the left fixing plate and the right fixing plate in a rotating mode through a torsion spring, a crank rod is fixedly arranged on the first rotating shaft, a brake block is fixedly arranged on the end face of the crank rod close to the side of the symmetrical center, a pull rope is fixedly arranged on the end face of the crank rod far away from the side of the symmetrical center, a first fixing sleeve is arranged on the side of the crank rod far away from the symmetrical center, the first fixing sleeves are respectively, when the brake is carried out, the side end face of the brake block close to the symmetric center is contacted with the side end face of the brake block far from the symmetric center, and the brake is realized by utilizing friction force.

4. The engineering cart capable of realizing reverse locking of wheels on an uphill slope as claimed in claim 1, wherein: the control device comprises a bearing baffle fixedly arranged in the control cavity, a push rod is arranged in the bearing baffle in a sliding connection manner, the left end of the push rod extends to the outer side of the left end face of the push handle, a fourth push block is fixedly arranged on the right end face of the push rod, the fourth push block is in abutting connection with the first push block at a corresponding position, a second fixing baffle is fixedly arranged on the push rod and is positioned on the right side of the bearing baffle, a third spring is fixedly arranged between the second fixing baffle and the bearing baffle, a second fixing sleeve is fixedly arranged on the push rod and is positioned on the left side of the bearing baffle, a second rotating shaft is arranged after the second fixing sleeve is arranged on the right side of the bearing baffle in a rotating manner and penetrates through the second fixing sleeve, a second driven rod is fixedly arranged on the right end face of the second rotating shaft, a fixture block is fixedly arranged on the right end face of the second driven rod, a fourth spring is fixedly arranged between the lower end face of the fixture block and, the inner wall of the upper side of the control cavity is provided with a clamping hole in a penetrating way, the clamping hole is positioned on the right side of the clamping block, when the second driven rod moves rightwards, the clamping block can be clamped in the clamping hole, the push handle is close to the end face of the side of the symmetrical center and is fixedly provided with a fixed plate, the fixed plate is fixedly provided with a fixed shaft, the fixed shaft is rotatably provided with a brake handle, a brake spring is fixedly arranged between the upper end face of the brake handle and the lower end face of the push handle, the inner wall of the lower side of the control cavity is provided with a third fixed sleeve in a penetrating way, the other end of the threading pipe is fixedly arranged in the third fixed sleeve, the other end of the threading pipe penetrates out of the other end of the threading pipe and is fixedly connected with the upper end face of the brake handle, the inner wall of the lower side of the control cavity, control chamber downside inner wall the automobile body left end face and front and back terminal surface are fixed and are equipped with the solid fixed ring of a plurality of, the cover spool is followed pass in the fixed ring, it is right to realize the direction and the fixing of cover spool.