A track trolley capable of turning in situ

Abstract

The present invention discloses a track trolley for turning in situ, comprising: a mounting base plate; four running wheels, all of which are rotatably connected to the mounting base plate, wherein the rotation center line of each running wheel is vertically arranged, and the rotation center line of each running wheel passes through the center of the wheel body of each running wheel; a steering mechanism, used to drive the four running wheels to rotate to change the direction of travel of the track trolley; a lifting mechanism, used to lift the entire track trolley; and a trolley positioning system, including a detection device for detecting whether the track trolley has reached a turning position, wherein when the detection device detects that the track trolley has reached a turning position, the track trolley stops moving, and then the lifting mechanism lifts the track trolley, the steering mechanism drives the four running wheels to complete the turning in situ, and then the lifting mechanism lowers the track trolley, and the track trolley continues to move. The present invention solves the problem that the track trolley needs to lay a track change switch before turning, and expands the scope of application of the track trolley.

Description

[0001] This application claims the priority of invention patent application 202010562903.4, entitled “A rail trolley for turning in situ”, filed with the China Intellectual Property Office on June 19, 2020, the entire contents of which are incorporated herein for reference. Technical Field

[0002] The invention relates to the technical field of rail trolleys, in particular to a rail trolley capable of turning in situ. Background Art

[0003] With the continuous advancement of science and technology, all walks of life are moving towards the direction of mechanical automation, and rail trolleys are a product that has emerged as the times require. For example, some of these rail trolleys can be used to transport materials in factory workshops, and some can be used for feeding in factory farming industries. In short, the application of rail trolleys has gradually become popular in manufacturing, farming and other industries.

[0004] The rail trolleys can basically only move along the laid tracks, and the existing rail trolleys usually have to change tracks through a dedicated track-changing switch before turning when they encounter a place where they need to turn. This results in a large turning radius being required to arrange the track-changing switch at the place where the rail trolley turns.

[0005] The turning method of the existing rail trolley requires that the application site of the rail trolley has sufficient area to support the rail trolley to turn. However, for some application sites with limited space and unable to lay track change turnouts, the existing rail trolley cannot be put into use. Therefore, the turning method of the existing rail trolley limits the scope of use of the rail trolley and has limitations. Summary of the invention

[0006] The purpose of the present invention is to provide a track trolley that can be turned in situ, so as to solve the problem that the track trolley needs to lay a track change switch before turning, thereby expanding the application scope of the track trolley.

[0007] To this end, the present invention adopts the following technical solutions:

[0008] A track trolley that can be turned in situ is used to move on a laid track, comprising: a mounting base; four running wheels, located below the mounting base, and rotatably arranged on both sides of the front end and the rear end of the mounting base, wherein the rotation center line of each running wheel is vertically arranged, and the rotation center line of each running wheel passes through the center of the wheel body of each running wheel, and the four running wheels are composed of a driving wheel and a driven wheel; a steering mechanism, mounted on the mounting base, used to drive the four running wheels to rotate to change the travel direction of the track trolley; a lifting mechanism, mounted on the mounting base, used to lift the entire track trolley, In the embodiment, the lifting mechanism lifts the track trolley before the running wheels rotate so that the four running wheels are separated from the track, and the lifting mechanism lowers the track trolley after the running wheels complete the rotation and turning to lower the four running wheels onto the track; and the trolley positioning system includes a detection device for detecting whether the track trolley reaches the turning position, wherein when the detection device detects that the track trolley reaches the turning position, the track trolley stops moving, and then the lifting mechanism lifts the track trolley, the steering mechanism drives the four running wheels to complete the on-site turning, and then the lifting mechanism lowers the track trolley, and the track trolley continues to move.

[0009] Furthermore, the four running wheels are driven by the steering mechanism to rotate 90° to enable the track trolley to turn 90° on the spot, and the turning part of the track is arranged vertically and crosswise.

[0010] Furthermore, the walking wheel is rotatably connected to the mounting base via a corresponding wheel changing connection assembly, the wheel changing connection assembly includes a wheel changing shaft rotatably arranged on the mounting base and a connecting bracket, the walking wheel and the wheel changing shaft are connected as a whole via the connecting bracket, and the wheel changing shaft is upright and located directly above its corresponding walking wheel body.

[0011] Furthermore, the four running wheels rotate synchronously under the driving of the steering mechanism, wherein the rotation directions of two adjacent running wheels among the four running wheels are opposite.

[0012] Furthermore, the steering mechanism includes a steering motor installed on the mounting base plate, a steering lever connected to the motor shaft of the steering motor, and two groups of tie rod assemblies, wherein the two groups of tie rod assemblies are respectively movably connected to the two ends of the steering lever, one group of tie rod assemblies is connected to two wheel changing shafts corresponding to the two traveling wheels on one side of the rail trolley, and the other group of tie rod assemblies is connected to two wheel changing shafts corresponding to the two traveling wheels on the other side of the rail trolley, wherein the four wheel changing shafts and the steering lever are linked through the two groups of tie rod assemblies to drive the four wheel changing shafts to rotate when the steering motor rotates, thereby realizing the in-situ steering of the traveling wheels.

[0013] Furthermore, the pull rod assembly includes a pull rod arm and two follower rods, the pull rod arm includes a transverse rod portion and a vertical rod portion, one end of the vertical rod portion away from the transverse rod portion is movably connected to the steering lever, and the steering mechanism also includes a guide block for guiding the vertical linear movement of the vertical rod portion, the two follower rods are symmetrically movably connected to the two ends of the transverse rod portion, and one end of the two follower rods away from the transverse rod portion are respectively fixedly connected to two wheel turning shafts, wherein when the steering motor rotates, it drives the two pull rod arms in the two groups of pull rod assemblies to move synchronously in opposite directions, and the moving pull rod arms then drive the follower rods to rotate, thereby realizing the in-situ steering of the walking wheels.

[0014] Furthermore, the mounting base plate is also provided with a limit stop column for limiting the rotation angle of the follower rod, wherein a limit stop column is respectively provided on both sides of each follower rod, and the follower rod rotates in the area between its two corresponding limit stop columns.

[0015] Furthermore, the lifting mechanism includes a lifting motor installed on the mounting base, a lifting seat driven to lift by the lifting motor, a lever pressing arm movably connected to the lifting seat, and an elastic push rod assembly that can move up and down, wherein the lever pressing arm is connected to the mounting base in a hinged manner, and an end of the lever pressing arm away from the lifting seat presses the elastic push rod assembly from top to bottom, and the elastic push rod assembly has a downward limit position that contacts the outside world.

[0016] Furthermore, the lever pressure arm and elastic push rod assembly are provided in four groups and are evenly distributed along the circumference of the motor shaft of the lifting motor, wherein the four elastic push rod assemblies are respectively located at the middle position between two adjacent walking wheels, and when the elastic push rod assembly is in the downward limit position, the elastic push rod assembly contacts the top of the track.

[0017] Furthermore, the elastic push rod assembly includes an upright push rod and a return spring for returning the push rod upward. A push rod seat is provided at the bottom of the mounting base plate. The push rod can be moved up and down in the push rod seat. The upper end of the return spring is fixedly connected to the push rod, and the lower end of the return spring is fixedly connected to the push rod seat.

[0018] The present invention has the following technical effects:

[0019] (1) The rail trolley of the present invention does not need to rely on a specially laid track-changing switch to turn like the existing rail trolleys. The rail trolley of the present invention can realize on-site turning by rotating the running wheels, so that it can turn in a manner without a turning radius, so that the track-changing switch at the track turning point is omitted during track laying, saving space, so that the rail trolley can be used in places with limited site area, expanding the scope of use of the rail trolley and improving the limitations of the use of the rail trolley.

[0020] (2) The rail trolley of the present invention can achieve a 90° turn on the spot, so that when laying the track, it only needs to be arranged vertically and crosswise at the track turning point. This not only simplifies the track laying work, but also further reduces the site condition requirements of the rail trolley for the application site.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 It is a schematic structural diagram of a track trolley for turning in situ according to an embodiment of the present invention;

[0024] Figure 2 An exploded view of an in-situ turning rail trolley according to an embodiment of the present invention;

[0025] Figure 3 The figure shows the position state of the steering mechanism in the present invention before the vehicle turns;

[0026] Figure 4 The figure shows the position state of the steering mechanism in the present invention after the vehicle completes a 90° turn;

[0027] Figure 5 It is a schematic diagram of the state of the on-site turning rail trolley of the present invention before turning on the track;

[0028] Figure 6 It is a schematic diagram of the state of the in-situ turning rail trolley of the present invention after completing a 90° turn on the track;

[0029] Figure 7 The main structure of the lifting mechanism in the present invention is shown; and

[0030] Figure 8 It is a schematic diagram of the connection between the driving wheel and the wheel turning shaft.

[0031] Description of Reference Numerals

[0032] 1. Install the base plate; 2. Travel wheels;

[0033] 21. Anti-slip part; 3. Steering mechanism;

[0034] 31. Steering motor; 32. Steering lever;

[0035] 33. Tie rod assembly; 331. Tie rod arm;

[0036] 3311, horizontal rod; 3312, vertical rod;

[0037] 332, follower rod; 34, guide block;

[0038] 4. Lifting mechanism; 41. Lifting motor;

[0039] 42. Lifting seat; 421. Seat body;

[0040] 422, lifting nut; 43, lever pressure arm;

[0041] 44. Elastic ejector rod assembly; 441. Ejector rod;

[0042] 442, return spring; 443, foot pad;

[0043] 51. Detection device; 6. Wheel direction-changing connection assembly;

[0044] 61. Wheel turning shaft; 62. Connecting bracket;

[0045] 7. Limit stop column; 8. Ejector seat;

[0046] 81. Guide sleeve; 100. Track. DETAILED DESCRIPTION

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0048] Combination Figures 1 to 8As shown, the in-situ turning rail trolley of the present invention is used to move on a laid track 100, and the track 100 is a double-track track. The in-situ turning rail trolley includes a mounting base plate 1, four running wheels 2 located below the mounting base plate 1, a steering mechanism 3 for driving the four running wheels 2 to rotate to change the travel direction of the running wheels 2, and a lifting mechanism 4 for lifting the entire rail trolley.

[0049] Among them, the four walking wheels 2 are rotatably arranged on both sides of the front end and the rear end of the mounting base plate 1, and the rotation center line of each walking wheel 2 is vertically arranged, and the rotation center line of each walking wheel 2 passes through the center of the wheel body of each walking wheel 2, thereby realizing the turning of the walking wheel 2 in situ.

[0050] The four running wheels 2 are composed of two driving wheels and two driven wheels, and the two driving wheels are arranged diagonally so that before and after the rail trolley turns, the rail trolley has a driving wheel on the front and rear sides along its travel direction, and the two driving wheels will not be located on a single track at the same time, which well ensures the movement stability of the rail trolley.

[0051] The driving wheel is connected with a driving motor for driving the wheel body to rotate, and the driving motor is a planetary reduction motor.

[0052] The inner side of the wheel body of the running wheel 2 has an anti-slip portion 21 for preventing the running wheel 2 from escaping from the track 100 . When the track trolley travels on the track 100 , the anti-slip portion 21 is located on the inner side of the track 100 .

[0053] The steering mechanism 3 is mounted on the mounting base plate 1. After the four running wheels 2 are driven by the steering mechanism 3 to rotate, the travel directions of the four running wheels 2 remain the same, that is, the rotation angles of the four running wheels 2 are the same. In order to ensure that the anti-slip portion 21 is always on the inner side of the track 100, the rotation directions of two adjacent running wheels 2 are opposite. In order to ensure that the track trolley can continue to move on the track 100 after turning, the rotation angle of the running wheel 2 is consistent with the steering angle at the turning point of the track 100.

[0054] In order to facilitate controlling the rotation angles of the four running wheels 2 to be the same, the steering mechanism 3 drives the four running wheels 2 to rotate synchronously.

[0055] The lifting mechanism 4 is installed on the mounting base plate 1, wherein the lifting mechanism 4 lifts the track trolley before the running wheels 2 rotate and turn so that the four running wheels 2 are separated from the track 100, and the lifting mechanism 4 lowers the track trolley after the running wheels 2 complete the rotation and turn to lower the four running wheels 2 onto the track 100, so that the track trolley can continue to move on the track 100.

[0056] In order to simplify the laying of the track 100 and maximize space saving, the four running wheels 2 in the present invention are driven by the steering mechanism 3 to rotate 90° to achieve a 90° turn on the spot of the track trolley. The turning point of the track 100 is arranged vertically and crosswise, and the turning point of the track 100 can be arranged as a cross track, such as Figure 5 and Figure 6 shown.

[0057] The on-site turning rail trolley of the present invention also includes a trolley positioning system and a control unit for trolley positioning. The driving wheel, lifting mechanism 4, and steering mechanism 3 are all controlled by the control unit. The trolley positioning system includes a GPS positioning chip electrically connected to the control unit. When the rail trolley is located near a turn by GPS positioning, the rail trolley slows down and starts to move slowly.

[0058] In order to accurately position the rail trolley at the turning position, the trolley positioning system further includes a detection device 51 for detecting whether the rail trolley reaches the turning position, and the detection device 51 is electrically connected to the control unit.

[0059] Among them, when the detection device 51 detects that the rail trolley reaches the turning position, the rail trolley stops moving, and then the lifting mechanism 4 lifts the rail trolley, and the steering mechanism 3 drives the four running wheels 2 to complete the on-site turning, and then the lifting mechanism 4 lowers the rail trolley to the track 100. At this point, the rail trolley completes the turning and can continue to move.

[0060] The detection device 51 adopts a proximity switch. There are four detection devices 51. The four detection devices 51 are respectively arranged between two adjacent running wheels 2, and each detection device 51 and the two running wheels 2 located on both sides thereof are arranged in a straight line.

[0061] Looking along the traveling direction of the trolley, two of the above four detection devices 51 are respectively located on the front and rear sides of the trolley, and the other two are respectively located on the left and right sides of the trolley. When the trolley moves to the turning position, the two detection devices 51 located on the front and rear sides of the trolley are respectively located directly above the two monorails of the rear track. At this time, the two detection devices 51 located on the front and rear sides of the trolley feed back a signal to the control unit that the trolley has reached the turning position.

[0062] The control unit will consider that the trolley has reached the turning position only when the two detection devices 51 located at the front and rear sides of the trolley respectively detect the two monorails of the rear travel track at the same time.

[0063] Specifically, combined Figures 1 to 8 As shown, the running wheel 2 is rotatably connected to the mounting base plate 1 through the corresponding wheel changing connection assembly 6, and the wheel changing connection assembly 6 includes a wheel changing shaft 61 and a connecting bracket 62 rotatably arranged on the mounting base plate 1. The running wheel 2 and the wheel changing shaft 61 are connected as a whole through the connecting bracket 62. The wheel changing shaft 61 is vertically arranged and located directly above the wheel body of the corresponding running wheel 2. When the wheel changing shaft 61 rotates, it drives the running wheel 2 to rotate in situ around the central axis of the wheel changing shaft 61.

[0064] The wheel direction-changing shaft 61 is rotatably connected to the mounting base plate 1 via a deep groove ball bearing and a thrust ball bearing.

[0065] Combination Figures 1 to 6 As shown, the steering mechanism 3 includes a steering motor 31 installed at the bottom of the mounting base plate 1, a steering lever 32 connected to the motor shaft of the steering motor 31, and two groups of tie rod assemblies 33, wherein the two groups of tie rod assemblies 33 are respectively movably connected to the two ends of the steering lever 32, one group of tie rod assemblies 33 is connected to two wheel turning shafts 61 corresponding to the two running wheels 2 on one side of the rail trolley, and the other group of tie rod assemblies 33 is connected to the two wheel turning shafts 61 corresponding to the two running wheels 2 on the other side of the rail trolley.

[0066] Among them, the two groups of tie rod assemblies 33 form a linkage relationship between the four wheel turning shafts 61 and the steering lever 32, so that when the steering motor 31 drives the steering lever 32 to rotate, the four wheel turning shafts 61 are driven to rotate, thereby realizing the in-situ steering of the walking wheel 2.

[0067] The steering motor 31 is a reduction motor, the motor shaft of the steering motor 31 passes through the mounting base plate 1, the steering lever 32 and the pull rod assembly 33 are both located above the mounting base plate 1, and the motor shaft of the steering motor 31 is fixedly connected to the center of the steering lever 32.

[0068] Specifically, combined Figures 1 to 6 As shown, the tie rod assembly 33 includes a tie rod arm 331 and two follower rods 332, the tie rod arm 331 includes a transverse rod portion 3311 and a vertical rod portion 3312 which are connected as one body, one end of the vertical rod portion 3312 away from the transverse rod portion 3311 is movably connected to the steering lever 32, and the steering mechanism 3 also includes a guide block 34 for guiding the vertical rod portion 3312 for vertical linear movement, and the guide block 34 is fixedly connected to the mounting base plate 1.

[0069] The two follower rods 332 are symmetrically movably connected to the two ends of the transverse rod 3311, and the ends of the two follower rods 332 away from the transverse rod 3311 are respectively fixedly connected to the two wheel direction-changing shafts 61. The two vertical rods 3312 in the two groups of tie rod assemblies 33 are located between the two transverse rods 3311. The connection points between the steering lever 32 and the two vertical rods 3312 are symmetrically arranged.

[0070] Both ends of the transverse rod 3311 have waist-shaped holes, and the follower rod 332 is movably connected to the corresponding waist-shaped hole on the transverse rod 3311 through a shoulder screw. The end of the vertical rod 3312 away from the transverse rod 3311 has a waist-shaped hole, and the steering lever 32 is movably connected to the waist-shaped hole of the vertical rod 3312 through a shoulder screw.

[0071] Among them, when the steering motor 31 drives the steering lever 32 to rotate, it drives the two tie rod arms 331 in the two groups of tie rod assemblies 33 to move synchronously in opposite directions. The moving tie rod arms 331 then drive the follower rod 332 to rotate, and the follower rod 332 drives the corresponding wheel changing shaft 61 to rotate, thereby realizing the in-situ steering of the walking wheel 2.

[0072] The steering mechanism 3 has the characteristics of ingenious design, simple structure and reasonable installation layout.

[0073] In order to ensure that the steering angle of the walking wheel 2 is 90°, Figures 1 to 6 As shown, the top of the mounting base plate 1 is also provided with a limit stop column 7 for limiting the rotation angle of the follower rod 332, wherein a limit stop column 7 is respectively provided on both sides of each follower rod 332, and the follower rod 332 rotates in the area between its two corresponding limit stop columns 7. The limit stop column 7 can be a pin or a bolt.

[0074] The limit stop column 7 is very simple to set up, but it can ensure that the steering angle of the running wheel 2 will not deviate, providing a guarantee for the rail trolley to reliably and smoothly turn on the track.

[0075] The steering mechanism 3 achieves the steering of the running wheel 2 by changing the rotation direction of the steering motor 31. Specifically, when the motor shaft of the steering motor 31 rotates clockwise, the steering lever 32 is driven to rotate clockwise, and the steering lever 32 drives the two pull rod arms 331 to move outward synchronously, and the follower rod 332 rotates accordingly, thereby achieving the steering of the running wheel 2. The state of the running wheel 2 after the steering is completed is referred to Figure 3 When the motor shaft of the steering motor 31 rotates counterclockwise, the steering lever 32 is driven to rotate counterclockwise, and the steering lever 32 drives the two pull rod arms 331 to move inward synchronously, and the follower rod 332 rotates accordingly, and the steering of the walking wheel 2 is realized again. At this time, the state of the walking wheel 2 after the steering is completed is referred to Figure 4 shown.

[0076] Combination Figures 1 to 7 As shown, the lifting mechanism 4 includes a lifting motor 41 installed on the top of the mounting base plate 1, a lifting seat 42 driven to lift by the lifting motor 41, a lever pressing arm 43 movably connected to the lifting seat 42, and an elastic push rod assembly 44 that can move up and down. The lifting motor 41 is a reduction motor, and the motor shaft of the lifting motor 41 is located at the center of the mounting base plate 1 and passes through the mounting base plate 1 downward, and the lifting seat 42, the lever pressing arm 43, and the elastic push rod assembly 44 are all located below the mounting base plate 1.

[0077] The bottom of the mounting base plate 1 is provided with an articulated seat, the lever pressing arm 43 is articulated in the articulated seat, and one end of the lever pressing arm 43 away from the lifting seat 42 abuts against the top of the elastic push rod assembly 44. When the end of the lever pressing arm 43 connected to the lifting seat 42 moves upward, the end of the lever pressing arm 43 away from the lifting seat 42 presses the elastic push rod assembly 44 from top to bottom and makes the elastic push rod assembly 44 move downward. The elastic push rod assembly 44 has a downward limit position that contacts the outside world. After descending to the downward limit position, the elastic push rod assembly 44 cannot continue to descend, thereby forcing the rail trolley to lift upward.

[0078] Combination Figures 1 to 7 As shown, there are four groups of lever pressing arms 43 and elastic push rod assemblies 44, which are evenly distributed along the circumference of the motor shaft of the lifting motor 41. The four elastic push rod assemblies 44 are respectively located at the middle position between two adjacent walking wheels 2, and when the elastic push rod assemblies 44 are at the downward limit position, the elastic push rod assemblies 44 abut against the top of the track 100.

[0079] When the lifting seat 42 moves upward driven by the lifting motor 41, the lever pressing arm 43 presses down the elastic push rod assembly 44. The elastic push rod assembly 44 moves downward until it contacts the track 100 and cannot continue to move downward, thereby forcing the track trolley to move upward as a whole to lift the track trolley.

[0080] After the steering of the walking wheel 2 is completed, the lifting seat 42 moves downward under the drive of the lifting motor 41, and the end of the lever pressure arm 43 that contacts the elastic push rod assembly 44 moves upward, and the elastic push rod assembly 44 moves upward and resets to the initial position, thereby lowering the rail trolley onto the rail 100.

[0081] The arrangement of the four groups of lever pressure arms 43 and the elastic push rod assembly 44 is stable and reliable, and can ensure the stability of the rail trolley during the lifting process.

[0082] Specifically, combined Figure 1 , Figure 2 ,as well as Figures 5 to 7 As shown, the elastic push rod assembly 44 includes an upright push rod 441, a return spring 442 for returning the push rod 441 to an upward position, and a foot pad 443 connected to the bottom of the push rod 441. A push rod seat 8 is provided at the bottom of the mounting base plate 1. A guide sleeve 81 is fixedly provided in the push rod seat 8. The push rod 441 is movably sleeved in the guide sleeve 81. The return spring 442 is sleeved outside the upper part of the push rod 441. The upper end of the return spring 442 is fixedly connected to the upper end of the push rod 441, and the lower end of the return spring 442 is fixedly connected to the guide sleeve 81.

[0083] Combination Figure 2 and Figure 7 As shown, the lifting seat 42 includes a seat body 421 hingedly connected to the lever pressing arm 43 and a lifting nut 422 fixed in the seat body 421. The lifting nut 422 is threadedly connected to the motor shaft of the lifting motor 41, and the seat body 421 has a waist-shaped hole at the connection with the lever pressing arm 43, and the hinge axis of the seat body 421 and the lever pressing arm 43 is movably arranged in the waist-shaped hole.

[0084] After the rail trolley is placed on the track, the foot pad 443 is very close to the top of the track, and the distance between the foot pad 443 and the top of the track is 1 to 2 cm. Therefore, the movement amplitude of the lever pressing arm 43 is not large when the rail trolley is raised or lowered. The design of the waist-shaped hole in the seat body 421 fully meets the displacement requirement of the lever pressing arm 43 in the horizontal direction when the trolley is raised or lowered.

[0085] The rail trolley of the present invention does not need to rely on a specially laid track-changing switch to turn like the existing rail trolleys. The rail trolley of the present invention can realize on-the-spot turning by rotating the running wheels, so that it can turn in a manner without a turning radius, so that the track-changing switch at the track turning point is omitted when laying the track, saving space, and allowing the rail trolley to be used in places with limited site area, thereby expanding the scope of use of the rail trolley and improving the use limitations of the rail trolley.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A track trolley capable of turning in situ, used for moving on a laid track (100), characterized in that: include: Installing the base plate (1); Four running wheels (2) are located below the mounting base plate (1) and are rotatably arranged on both sides of the front end and the rear end of the mounting base plate (1), wherein the rotation center line of each running wheel (2) is arranged vertically, and the rotation center line of each running wheel (2) passes through the center of the wheel body of each running wheel (2), and the four running wheels (2) are composed of a driving wheel and a driven wheel; A steering mechanism (3) is mounted on the mounting base plate (1) and is used to drive the four running wheels (2) to rotate so as to change the travel direction of the rail trolley; a lifting mechanism (4) mounted on the mounting base plate (1) and used for lifting the entire rail trolley, wherein the lifting mechanism (4) lifts the rail trolley before the running wheels (2) rotate so that the four running wheels (2) are separated from the track (100), and the lifting mechanism (4) lowers the rail trolley after the running wheels (2) complete the rotation and turn so that the four running wheels (2) are lowered onto the track (100); and The trolley positioning system comprises a detection device (51) for detecting whether the track trolley has reached a turning position. When the detection device (51) detects that the rail trolley has reached a turning position, the rail trolley stops moving, and then the lifting mechanism (4) lifts the rail trolley, and the steering mechanism (3) drives the four running wheels (2) to complete on-site turning, and then the lifting mechanism (4) lowers the rail trolley, and the rail trolley continues to move.

2. The in-situ turning rail trolley according to claim 1, characterized in that: The four running wheels (2) are driven by the steering mechanism (3) to rotate 90 degrees to enable the track trolley to turn 90 degrees in situ, and the turning point of the track (100) is arranged vertically and crosswise.

3. The in-situ turning rail trolley according to claim 2, characterized in that: The running wheel (2) is rotatably connected to the mounting base plate (1) via a corresponding wheel changing connection assembly (6); the wheel changing connection assembly (6) comprises a wheel changing shaft (61) rotatably arranged on the mounting base plate (1) and a connecting bracket (62); the running wheel (2) and the wheel changing shaft (61) are connected as a whole via the connecting bracket (62); the wheel changing shaft (61) is arranged vertically and is located directly above the wheel body of the corresponding running wheel (2).

4. The on-site turning rail trolley according to claim 3 is characterized in that: The four running wheels (2) rotate synchronously under the drive of the steering mechanism (3), wherein two adjacent running wheels (2) among the four running wheels (2) rotate in opposite directions.

5. The on-site turning rail trolley according to claim 4, characterized in that: The steering mechanism (3) comprises a steering motor (31) mounted on the mounting base plate (1), a steering lever (32) connected to the motor shaft of the steering motor (31), and two groups of tie rod assemblies (33). The two groups of tie rod assemblies (33) are respectively movably connected to the two ends of the steering lever (32), one group of tie rod assemblies (33) is connected to two wheel turning shafts (61) corresponding to the two running wheels (2) located on one side of the rail trolley, and the other group of tie rod assemblies (33) is connected to two wheel turning shafts (61) corresponding to the two running wheels (2) located on the other side of the rail trolley. The two groups of tie rod assemblies (33) enable the four wheel turning shafts (61) to form a linkage relationship with the steering lever (32), so that when the steering motor (31) rotates, the four wheel turning shafts (61) are driven to rotate, thereby realizing the on-site steering of the walking wheel (2).

6. The on-site turning rail trolley according to claim 5, characterized in that: The pull rod assembly (33) includes a pull rod arm (331) and two follower rods (332). The pull rod arm (331) includes a transverse rod portion (3311) and a vertical rod portion (3312). One end of the vertical rod portion (3312) away from the transverse rod portion (3311) is movably connected to the steering lever (32). The steering mechanism (3) also includes a guide block (34) for guiding the vertical rod portion (3312) to move in a vertical linear direction. The two follower rods (332) are symmetrically movably connected to the two ends of the transverse rod portion (3311), and one end of the two follower rods (332) away from the transverse rod portion (3311) is respectively fixedly connected to the two wheel turning shafts (61). When the steering motor (31) rotates, it drives the two tie rod arms (331) in the two tie rod assemblies (33) to move synchronously in opposite directions. The moving tie rod arms (331) then drive the follower rod (332) to rotate, thereby achieving on-site steering of the walking wheel (2).

7. The on-site turning rail trolley according to claim 6, characterized in that: The mounting base plate (1) is also provided with a limit stop column (7) for limiting the rotation angle of the follower rod (332), wherein a limit stop column (7) is respectively provided on both sides of each follower rod (332), and the follower rod (332) rotates in the area between its two corresponding limit stop columns (7).

8. The in-situ turning rail trolley according to any one of claims 1 to 7, characterized in that: The lifting mechanism (4) comprises a lifting motor (41) mounted on the mounting base plate (1), a lifting seat (42) driven to lift by the lifting motor (41), a lever pressing arm (43) movably connected to the lifting seat (42), and an elastic push rod assembly (44) movable up and down. The lever pressing arm (43) is connected to the mounting base plate (1) in a hinged manner, and one end of the lever pressing arm (43) away from the lifting seat (42) presses the elastic push rod assembly (44) from top to bottom, and the elastic push rod assembly (44) has a downward limit position that contacts the outside world.

9. The on-site turning rail trolley according to claim 8, characterized in that: The lever pressing arm (43) and the elastic push rod assembly (44) are provided in four groups and are evenly distributed along the circumference of the motor shaft of the lifting motor (41), wherein the four elastic push rod assemblies (44) are respectively located at the middle position between two adjacent walking wheels (2), and when the elastic push rod assembly (44) is in the downward limit position, the elastic push rod assembly (44) contacts the top of the track (100).

10. The on-site turning rail trolley according to claim 9, characterized in that: The elastic push rod assembly (44) comprises a push rod (441) arranged upright and a return spring (442) used for the push rod (441) to return upward; a push rod seat (8) is arranged at the bottom of the mounting base plate (1); the push rod (441) is located in the push rod seat (8) so as to be movable up and down; the upper end of the return spring (442) is fixedly connected to the push rod (441); and the lower end of the return spring (442) is fixedly connected to the push rod seat (8).

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