WO2014201977A1

WO2014201977A1 - Trolley replacement device and method

Info

Publication number: WO2014201977A1
Application number: PCT/CN2014/079852
Authority: WO
Inventors: 贠汝平; 黄东生; 姚朝胜; 于忠念
Original assignee: 山东省冶金设计院股份有限公司
Priority date: 2013-06-18
Filing date: 2014-06-13
Publication date: 2014-12-24
Also published as: CN104236310B; CN104236310A; IN2014DN10465A

Abstract

The present invention relates to the technical field of replacement of a trolley of a sintering machine and a belt-type calcinating machine in the metallurgical industry. Disclosed are a trolley replacement device and method. The trolley replacement device comprises a trolley, internal straight rails, internal curved rails, external straight rails, external curved rails, a main drive wheel, trolley removal rails, and trolley insertion rails; the external curved rails at two sides of the main drive wheel are divided into lower movable external curved rails (202), middle fixed external curved rails (203), and upper movable external curved rails (201); the upper ends of the lower movable external curved rails (202) are connected to the lower ends of the middle fixed external curved rails; and one end of the upper movable external curved rails is connected to one end of the trolley insertion rails. The present invention replaces the trolley of a sintering machine or a belt-type calcinating machine without stopping the machine or requiring extra trolley replacement time, thus improving production efficiency; the sintering machine or the belt-type calcinating machine does not need to be stopped, and the operation of reducing or stopping wind is not needed, thus ensuring no change in production; and the qualified product rate and tumbling index are not reduced as a result of steady production.

Description

Trolley replacement device and trolley replacement method

The invention relates to a trolley changing device and a trolley changing method, in particular to a trolley replacement of a sintering machine and a belt roasting machine in a metallurgical industry.

In the case of the existing sintering machine, the replacement or installation of the trolley is at the middle end of the sintering machine and the upper part of the bellows. For the belt roaster, the replacement or installation of the trolley is in the belt roaster. The head and the upper part of the bellows. Taking the sintering machine as an example, when the faulty trolley is replaced, the feeding device stops feeding, the faulty trolley and the trolleys before and after it are in a empty state, and the faulty trolley in the empty state generally runs to a suitable position in the tail, sintering When the machine stops running, start the hydraulic push rod to move the tail moving frame backwards, loosen the trolleys close to each other, and then lift the faulty trolley to the platform maintenance position through the crane above the sintering machine, and then lift the standby trolley. Loading, hydraulic push T pressure relief, sintering machine start running.

This type of replacement is very convenient during the construction period or planned maintenance; however, in normal production, the replacement and installation of the trolley at this location has the following major effects on the production of the sintering machine or the belt roaster:

Long downtime

Sintering machine or belt roasting machine shall stop running; perform wind reduction or air stop operation; hoist the trolley that needs to be replaced; clean the sinter material scattered on the fixed slideway; etc.; hoist into the spare trolley; Air supply operation; Sintering machine or belt roasting machine is restarted. It takes only ten minutes to stop directly, and with other time, it takes about 30 minutes to replace the trolley.

2. The production conditions fluctuate greatly

Sintering or roasting is a process of continuous pumping (sending) of wind, combustion, and heat exchange. Long-term shutdowns can change production conditions and cause large fluctuations in production conditions.

3, affect product quality

Due to large fluctuations in production conditions, product yields are reduced and the drum index is lowered. SUMMARY OF THE INVENTION It is an object of the present invention to provide a trolley changing apparatus and method in the case of a sintering machine or a belt roasting machine without stopping the machine to solve the problems of the prior art.

The technical solution of the present invention is as follows:

The trolley replacement device of the first scheme includes a trolley, an inner straight rail, an inner curved rail, an outer straight rail, an outer curved rail, a main transmission wheel, a trolley moving out rail, and a trolley moving into the rail, wherein: the two sides of the main transmission wheel The outer curved rail is divided into a lower movable outer curved rail, a middle fixed outer E3⁄4 rail, and an upper movable outer curved rail; the upper movable outer curved rail has an upper end connected to a lower fixed end outer curved rail; and the upper movable outer curved rail has one end Connected to the end of the trolley moving into the rail; the trolley moving into the rail is located outside the upper movable E3⁄4 rail, and is connected with the upper movable outer curved rail, ^ is moved in the trolley; the trolley is removed from the rail and is located in the lower movable outer The outside of the rail is used for the removal of the trolley.

In the case of the trolley changing device of the second aspect, the connection is hinged; the upper end of the lower movable outer curved rail is hinged to the lower end of the central fixed outer curved rail; and one end of the upper movable outer curved rail is moved into the rail with the trolley One end is hinged; the trolley is moved into the rail on the outer side of the upper movable outer curved rail, and is hinged to the upper movable outer curved rail.

In the case of the trolley replacement device of the third aspect, the upper movable outer curved rail includes a rail I and a rail II, the upper end of the rail II is connected or hinged to the upper outer straight rail, and the lower end of the rail II and the upper end of the rail I are driven by the pin The connection is combined into a stack, and the lower end of the rail I is connected or hinged to one end of the trolley that is moved into the rail.

In the trolley replacement device of the fourth aspect, the inner side of the upper movable outer curved rail is a curved surface, and the outer side is a flat surface.

In the fifth embodiment of the trolley changing device, the inner side of the rail I is a curved surface, and the outer side of the rail I is a flat surface.

In the sixth embodiment of the trolley changing device, the upper movable outer curved rail includes a rail I, and a portion of the upper movable outer curved rail that is in contact with the inner curved rail is provided with an arc-shaped step that matches the outer shape, and is used for The weight of the trolley is taken into account, and the weight is directly mounted on the rail I.

In the case of the trolley changing device of the seventh aspect, the lower movable outer curved rail is rotatable outwardly about the hinge point of the upper end thereof and returned to the initial position by the action of the weight and/or the spring.

In the case of the trolley changing device of the eighth aspect, a locking device is arranged around the initial position of the lower movable outer curved rail, and the locking device is composed of a locking block, a cylinder and a locking bracket, the locking block and the cylinder The utility model is mounted on the locking support; when the locking device is in operation, the lower movable curved rail is in a locked state; the locking device is released, and the lower movable outer curved rail is in a free state. In the case of the trolley changing device of the ninth aspect, the lower movable outer curved rail is at the initial position i吋, and the lower end portion thereof is aligned with and close to the lower outer straight rail.

In the case of the trolley changing device of the tenth aspect, one end of the trolley moving out of the rail is aligned with and close to the lower outer straight rail.

In the case of the trolley changing device of the eleventh aspect, the upper movable curved rail is provided with a spring or a heavy hammer.

(2013); The upper movable outer curved rail can be rotated around its hinge point with one end of the trolley moving into the rail, changing from the initial position to the changing position; and returning from the changing position to the initial position by means of a spring or a heavy hammer.

In the trolley changing device of the twelfth aspect, in the changing position, the upper movable outer curved rail is located between the upper inner straight rail and the trolley moving into the rail and is aligned with the upper inner straight rail, and the upper movable outer curved The outer plane portion of the rail and the upper inner straight rail and the trolley are moved into the rail to form a complete guide rail surface. In the initial position, the inner curved surface portion of the upper movable outer curved rail and the central fixed outer curved rail and the upper outer straight rail constitute a complete guide rail. surface.

In the trolley replacement device of the thirteenth aspect, a spring or a weight is provided on the upper movable outer curved rail; the rail I is rotated around the hinge point of the rail and the trolley, and the rail II and the rail I are respectively wound around the rail. The hinge point of the II and the rail I is rotated, and the upper movable outer curved rail is changed from the initial position to the changing position; and the spring or the weight is restored from the shifting position to the initial position.

With regard to the trolley changing device of the fourteenth aspect, in the changing position, the rail I is located between the upper inner straight rail and the trolley moving into the rail and is aligned with the upper inner straight rail, the outer plane portion and the upper portion of the rail I The straight rail and the trolley are moved into the rail to form a complete guide rail surface, and the rail II is in an approximately vertical state.

In the case of the trolley changing device of the fifteenth aspect, the trolley changing device further includes an auxiliary device including a frame, a traverse trolley, a turning mechanism, a trolley lifting mechanism, a moving in mechanism, and a removing mechanism.

In the case of the trolley replacement method of the sixteenth aspect, the following steps are included: 1) when the lower movable outer curved rail is in the initial position, the locking device around the initial position is released, and the lower movable outer curved rail is locked. Turning into a free state; 2) The trolley to be removed is moved forward by the teeth of the main transmission wheel and/or the subsequent trolley, and pushes the lower movable outer rail to rotate outwardly around the hinge point of the upper end thereof. The trolley to be removed is removed from the trolley along the trolley; 3) When the lower movable outer rail is disengaged from the trolley to be removed, it returns to the initial position by the action of the weight and/or spring force, and the locking device Work, the lower movable outer rail is locked and locked; 4) need to move into the trolley and move along the trolley into the rail to move to the main drive wheel, push The movable upper outer curved rail rotates around the hinge point of the end of the moving rail with the trolley, so that the upper movable outer curved rail is changed from the initial position to the changing position, and needs to be moved into the outer side of the upper movable outer curved rail of the trolley. Partially moved in;

5) After the wheel that needs to be moved into the trolley leaves the outer part of the upper movable outer rail, the upper movable outer rail rotates back along the hinge point by the spring or the weight to return to the initial position.

In the case of the trolley replacement method of the seventeenth scheme, the following steps are also included: 1) after the trolley to be removed is moved outward by a certain distance, when the hook of the trolley is pulled to hook the trolley, the cylinder of the cylinder or the cylinder The rod movement causes the pull-out trolley to drive the trolley to move along the trolley to move out of the trolley to the traverse trolley; 2) the traverse trolley holds the trolley to move in the vertical direction along the trolley to the flip position; 3) in the flip position, the lifting mechanism Move the trolley up to the turning mechanism, and turn it 180° in the vertical plane by the turning machine, turn the trolley, wait for lifting and maintenance; 4) Repair the trolley that needs to be moved into the trolley and move it into the rail. Located between the moving mechanism and the main transmission wheel and positioned for waiting for feeding; 5) When feeding, the cylinder rod of the moving cylinder or cylinder is extended to push the trolley, and the trolley that needs to be moved is pushed by the propulsion trolley The car moves into the orbit.

1, replace the trolley without stopping

According to the trolley changing device and method of the present invention, the sintering machine or the belt roasting machine can be replaced without stopping the machine, and no additional trolley replacement time is required, thereby improving production efficiency.

2, stable production conditions

There is no sintering machine or belt roasting machine to stop and perform wind reduction or wind stop operation, the production status has not changed, and it is relatively stable.

3, does not affect product quality

Due to stable production conditions, the product qualification rate and drum index did not decrease.

Figure 1 is a front view of the normal operation of the sintering machine;

Figure 2 is a top view of the normal operation of the sintering machine;

Figure 3 is a cross-sectional view taken along line A-A of Figure i;

Figure 4 is a cross-sectional view taken along line B-B of Figure 1;

Figure 5 is a front view of the state in which the sintering machine is removed from the trolley;

Figure 6 is a front view of the trolley in a state in which the sintering machine is moved in; Figure 7 is a diagram of a quick removal mechanism;

Figure 8 is a diagram of a fast moving mechanism;

Figure 9 is a traverse cart diagram;

Figure 10 is a flip mechanism diagram;

Figure 11 is a cross-sectional view taken along line K-K of Figure 10;

Figure 12 is a front elevational view showing the state in which the sintering machine of Embodiment 2 is moved into the trolley.

Description of the symbol

1 frame, 2 cars moved into the rail, 3-inner curved rail, 4 outer straight rail, 5 inner straight rail, 6 main drive wheels, 7 outer straight rails, 8-inner straight rail, 9-trailer removed rail, 〗 0 fast moving mechanism, 101-cylinder or cylinder, 】 02- support, 104 propulsion trolley, 105 cylinder, 〗 06 wheel, 20-outer curved rail, 201- upper movable outer curved rail, 2011 rail I, 2012 rail II, 2013 weight, 20 4 pin, 2015 pin, 2016-pin, 202-lower movable outer track, 203-central fixed outer track, 204-heavy, 30 car, 30]- Roller sleeve, 302-trailer wheel, 40 locking device, 401-locking block, 402-cylinder, 403-locking bracket, 50-traverse trolley, 501-positioning plate, 502-frame, 503-wheel , 504 rail, 505-base, 506 drive, 60-fast removal mechanism, 601-support frame, 602-bearing, 603-cylinder or cylinder, 604- pull-out trolley, 605-wheel, 606-hook, 70 - Inverting mechanism, 701-slewing frame, 702-drive, 703-bearing, 704 sprocket or gear, 705-roller one, 706-roller two, 707 lower bracket, 708-chain or gear, 709 - Pin, 80-lift mechanism.

Specific embodiments of the present invention will be described with reference to the embodiments and the drawings. The picture has 12 pages.

Embodiment 1 is shown in Fig. 1 to Fig. 11.

A trolley changing device, comprising a trolley 30, an inner straight rail 5, 8, an inner curved rail 3, an outer straight rail 4, an outer curved rail 20, a main transmission wheel 6, a trolley moving out of the rail 9, and a trolley moving in Track 2 and so on.

The inner straight rails 5, 8 and the inner curved rail 3 constitute an inner guide rail; the outer straight rails 4, 7 and the outer curved rail 20 constitute an outer guide rail; the inner guide rail is provided with a main drive wheel 6, and the main drive wheel 6 has teeth Located between the inner guide rail and the outer guide rail.

The outer curved rail 20 is mounted on both sides of the main transmission wheel 6, and is driven by the lower movable outer rail 202 and the middle portion. The outer curved rail 203, the upper movable outer curved rail 201 and the like are composed.

The upper end of the lower movable outer curved rail 202 is hinged to the lower end of the central fixed outer curved rail 203. In the hinged position, the thickness of the central fixed outer curved rail 203 is smaller than the overall thickness, and the upper end of the lower movable outer curved rail 202 is provided with a weight. Hammer 204. In the normal operation state (initial state) of the sintering machine, the lower end of the lower movable outer curved rail 202 is pushed by the oil cylinder 402 of the locking device 40 to be locked; the trolley moves out of the rail 9 and the lower movable outer curve The joint of the lower end of the rail 202 has a thickness smaller than the overall thickness, and has a 1/4 arc step that coincides with the lower end arc of the lower movable outer curved rail 202, thereby ensuring that the lower movable outer curved rail 202 is in a locked state. Stability.

When the wheel 302 of the trolley that needs to be removed approaches the lower end of the lower movable outer curved rail 202, the cylinder 402 of the locking device 40 pulls the locking block 401 backward to be disengaged from the lower end of the lower movable outer curved rail 202, and can be moved outside. The curved rail 202 is in a free state, and the trolley that needs to be removed is moved along the removal guide rail 9 under the driving of the main transmission wheel 6, and the lower movable outer curved rail 202 is fixed to the middle portion under the driving of the wheel 302 of the trolley to be removed. The pinned shaft of the curved rail 203 is rotated upwards in the center. When the rolling sleeve 301 at the rear of the trolley that needs to be removed is not restricted by the teeth of the main transmission wheel 6, the quick removal mechanism 60 is moved by the expansion and contraction of the oil cylinder 603. Pulling the hook 606 on the cart 604 to hook the trolley, thereby quickly pulling out the trolley. When the lower movable outer curved rail 202 is disengaged from the limit of the wheel 302 of the trolley to be removed, it is returned to the initial position by the weight 204, and the cylinder 402 of the locking device 40 pushes the locking block 401 to lock it.

After the quick-moving mechanism 60 changes the hook head 606, the removed trolley 30 is pulled by the cylinder 603 to continue to travel outward until the trolley 30 is moved to the upper portion of the trolley traverse cart 50, and the wheel 302 of the trolley 30 falls into the horizontal direction. In the circular arc-shaped groove on the positioning plate 501 of the trolley 50, the cylinder 603 stops pulling, and instead pushes forward, and pushes until the hook head 606 is disengaged from the trolley 30 and stops. At this time, the driving device 506 of the traverse trolley 50 drives the trolley traverse cart 50 to move along the guide rail 504, and stops when the traverse trolley 50 moves directly under the trolley turning mechanism 70. At this time, the lifting mechanism 80 starts to work. The trolley rises into the "Π" shaped groove of the turning mechanism 70, rotates the lower bracket 707 of the turning mechanism 70 to the closed state and locks, and the lifting mechanism 80 is returned to the original position, and the driving device 702 of the turning mechanism 70 is activated to make the table After the car is rotated 180 degrees, it stops, the lower bracket 707 of the turning mechanism 70 is opened, and the removed trolley is transferred to the position where the trolley is inspected.

Upper movable E3⁄4 rail 201 by rail 12011, rail 112012, heavy hammer 2013, pin 2014, 2015, In 2016, the outer side of the rail 12011 is a plane, and the inner side is a circular arc surface. The rail 1201 is articulated on the trolley moving into the rail 2, the rail II20 2 is hinged on the outer straight rail 4, and the rail 12011 and the rail II2012 are connected by the pin 2016. One end of the rail II2012 is provided with a weight hammer 2013.

The trolley that needs to be moved in is moved to the trolley and moved into the guide rail 2, and the trolley to be removed is removed, and two empty slots are formed on the main transmission wheel 6, when the two empty slots on the main transmission wheel 6 rotate In a certain position, the cylinder 101 of the quick-moving mechanism 10 pushes the propulsion trolley 104 to move, and the propulsion trolley 104 moves through the two cylinders 105 to move the trolley, and when the trolley wheel 302 to be moved in contact with the outer side of the rail 12011, Under the action of the pressure of the trolley wheel 302, the rail: [2011 downward rotation, causing the upper movable outer curved rail 201 to be folded and deformed, when the rail] 2011 is rotated downward to the outer side and coincides with the upper surface of the trolley moving into the rail 2, The movable outer curved rail 201 is folded and deformed to reach the limit position, which is also called the shifting position. At this time, the rail 12011 moves the trolley into the rail 2 and the inner straight rail 5, and the wheel 302 of the trolley to be moved in can enter. On the straight rail 5, when the trolley to be moved reaches a certain position, the rolling sleeve 301 of the trolley to be moved is under the movement of the teeth of the main transmission wheel, and the trolley continues to move forward, in the trolley to be moved in. Wheel 302 After the off-track outer surface 12011, 2013 under the weight for) ¾, upper portion 201 of the movable outer bend deformation occurs expand and return to the initial position.

Embodiment 2, shown in Figure 12.

This embodiment is a change made on the basis of Embodiment 1, and the difference is that:

1. The upper movable outer curved rail 201 in the embodiment 1 is tubular, the rail 112012 is cancelled, the single rail is added and the long rail 12011 is added, and the weight 2013 is directly mounted on the rail 1201.

2. At the lower right corner of the movable outer curved rail 201, an arc-shaped step matching the outer shape of the inner curved rail 3 is provided. The rest, the same as the example i, can be referred to the description of the specification and the embodiment 1.

In addition, it is to be noted that the above-described embodiments are examples of the present invention, and one of its functions is to explain the present invention and should not be construed as limiting the present invention.

Claims

A trolley replacement device includes a trolley, an inner straight rail, an inner curved rail, an outer straight rail, an outer curved rail, a main drive wheel, a trolley moving out of the rails, and a trolley moving into the rails, wherein:

The outer curved rails on both sides of the main transmission wheel are divided into a lower movable outer curved rail (202), a middle fixed outer curved rail (203), and an upper movable outer curved rail (201);

The upper end of the lower movable outer curved rail (202) is connected with the lower end of the middle fixed outer curved rail;

One end of the upper movable outer E¾ rail is connected to the end of the trolley moving into the rail;

The trolley moving rail (2) is located outside the upper movable outer curved rail (201) and is connected to the upper movable outer curved rail (201) for moving the trolley in;

The trolley moving rail (9) is located outside the lower movable outer curved rail (202) and is used for moving the trolley out.

2. The trolley replacement device as claimed in claim 1, wherein: the connection is hinged; the upper end of the lower movable outer curved rail (202) is hingedly connected to the lower end of the middle fixed outer curved rail;

One end of the upper movable outer curved rail is hinged with the end of the trolley moving into the rail;

The trolley moving rail (2) is located outside the upper movable outer curved rail (201) and is hingedly connected with the upper movable outer curved rail (201).

3. The trolley replacement device according to claim 1 or 2, wherein: the upper movable outer curved rail (201) includes rail I (2011) and rail II (2012), and the upper end of rail II is connected to the upper outer straight rail. Or hinged, the lower end of rail II and the upper end of rail I are combined into one by a pin connection, and the lower end of rail I is connected or hinged with one end of the trolley moving into the rail (2).

4. The trolley changing device according to any one of claims 1 to 3, wherein the upper movable outer curved rail

5. The trolley changing device as claimed in claim 3, wherein the inner side of the rail I is a curved surface and the outer side of the rail I is a flat surface.

6. The trolley replacement device as claimed in claim 1, wherein: the upper movable outer curved rail (201) includes rail I (2011), and the upper movable outer curved rail (201) and the inner curved rail (3) The connecting parts are equipped with arc steps with matching shapes to bear the weight of the moving trolley. The weight (2013) is directly installed on the rail I.

Ί. The trolley changing device according to any one of claims 1 to 6, wherein: the lower movable outer curved rail It can rotate outward around the hinge point at its upper end and return to the initial position by the action of a weight and/or spring.

8. The trolley changing device according to any one of claims 1 to 7, wherein: a locking device is provided around the initial position of the lower movable outer curved rail (202), and the locking device locking block (401) , an oil cylinder (402) and a locking support (403). The locking block (401) and the oil cylinder (402) are installed on the locking support (403); when the locking device is working, the lower movable outer curved rail is in Locked state; Release the locking device, and the lower movable outer curved rail is in a free state.

9. The trolley changing device according to any one of claims 1 to 8, wherein: when the lower movable outer curved rail is in the initial position, its lower end is aligned with and close to the lower outer straight rail.

10. The trolley changing device according to any one of claims 1 to 9, wherein: one end of the trolley moved out of the rail is aligned with and close to the lower outer straight rail.

11. The trolley replacement device according to any one of claims 1 to 4, wherein: a spring or a weight (2013) is provided on the upper movable outer curved rail; the upper movable outer curved rail can be connected with the trolley around it The hinge point at one end of the moving rail rotates and changes from the initial position to the car-changing position; and returns from the car-changing position to the original position with the help of a spring or weight.

12. The trolley changing device according to any one of claims 1 to 4 or 11, wherein: in the trolley changing position, the upper movable outer curved rail is located between the upper inner straight rail and the trolley moving rail and is connected with the upper inner curved rail. The straight rails are aligned and close together, and the outer flat part of the upper movable outer curved rail, the upper inner straight rail and the trolley moving rail form a complete guide rail surface. In the initial position, the inner curved surface part of the upper movable outer curved rail is in contact with the middle fixed outer curved rail. The rail and the upper outer straight rail form a complete guide rail surface.

13. The trolley changing device as claimed in claim 3 or 5, wherein: a spring or a weight is provided on the upper movable outer curved rail; rail I rotates around its hinge point with the trolley moving into the rail, and rail II and Rail I rotates around the hinge points of rail II and rail I respectively, and the upper movable outer curved rail changes from the initial position to the car-changing position; and returns to the original position from the car-changing position with the help of a spring or weight.

14. The trolley changing device as claimed in claim 13, wherein: in the trolley changing position, the rail I is located between the upper inner straight rail and the trolley moving rail and is aligned and close to the upper inner straight rail, and the outer planar part of the rail I Together with the upper inner straight rail and the trolley moving rail, it forms a complete guide rail surface. Rail II is in an approximately vertical state.

15. The trolley changing device according to any one of claims 1 to 4, wherein: the trolley changing device further includes an auxiliary device, and the auxiliary device includes a frame (1), a traverse trolley (50), and a turning mechanism. (70), trolley lifting mechanism (80), moving in mechanism (10), moving out mechanism (60).

16. A method for replacing a trolley, which includes the following steps:

1) When the lower movable outer curved rail is in the initial position i-inch, release the locking device around the initial position, so that the locking state of the lower movable outer curved rail changes to the automatic state;

2) The trolley that needs to be moved out is driven by the gear teeth of the main transmission wheel and/or the subsequent trolley, and moves forward and pushes the lower movable outer curved rail to rotate outward around the hinge point at its upper end. The trolley that needs to be moved out Move out along the trolley's moving rail; 3) When the lower movable outer curved rail is out of contact with the trolley to be removed, it returns to the initial position by the action of the weight force and/or spring force, the locking device works, and the lower part is movable. The outer curved rail is locked and in a locked state;

4) The moving trolley needs to move along the trolley moving rail toward the main transmission wheel, and push the upper movable outer curved rail to rotate around the hinge point with one end of the trolley moving rail, so that the upper movable outer curved rail changes from the initial position to To change the position, the trolley needs to be moved in along the outer part of the upper movable outer curved rail;

5) After the wheels that need to be moved into the trolley leave the outer part of the upper movable outer curved rail, the upper movable outer curved rail rotates back along the hinge point with the help of springs or weights, and returns to the initial position.

17. The trolley replacement method as claimed in claim 16, further comprising the following steps:

1) After the trolley that needs to be moved out moves a certain distance, when the hook head (606) of the pull-out trolley hooks the trolley, the cylinder cup of the oil cylinder or air cylinder moves, so that the pull-out trolley drives the trolley to move along the trolley and derails. Move to traverse car (50)

2) The traversing trolley (50) supports the trolley and moves it to the flipping position along the vertical direction of the trolley movement;

3) In the overturning position, the lifting mechanism (80) moves the trolley upward into the overturning mechanism (70), and the overturning machine performs a 180° flip in the vertical plane to right the trolley, waiting for lifting and maintenance;

4) The repaired trolley that needs to be moved is transported to the trolley moving rail (2), positioned between the moving mechanism (10) and the main transmission wheel (6), and is waiting to be moved in;

5) When feeding in, the cylinder rod of the oil cylinder or air cylinder of the moving mechanism extends to push the cone into the trolley (104), and the push trolley (104) pushes the trolley to be moved in to move along the trolley moving rail.