Telescopic trolley

Abstract

The present application relates to the technical field of general assembly, and discloses a telescopic trolley, which comprises a tool box, a trolley frame, a telescopic assembly and a traction assembly, the trolley frame comprises a stand column, the tool box is fixedly connected with the telescopic assembly, the telescopic assembly comprises a first telescopic frame, the first telescopic frame is slidably connected with the trolley frame, the traction assembly is arranged below the telescopic assembly, the traction assembly comprises a traction rod and a traction cable, the traction rod is slidably connected with the stand column, the traction cable is connected with the traction rod and the first telescopic frame simultaneously, when the traction rod slides downward, the traction cable pulls the first telescopic frame to slide toward the outside of the trolley frame. The traction rod is slid downward to make the telescopic assembly slide toward the outside of the trolley frame, and the tool box is extended to be closer to the vehicle, so that the operator can quickly take and place the required materials and tools, the working hours of taking and placing are saved, and the production rhythm is ensured.

Description

Technical Field

[0001] This invention relates to the field of final assembly technology, and more particularly to a telescopic trolley. Background Technology

[0002] In current automobile production processes, various material racks are set up around the production line to hold the materials required for production. However, as the production pace gradually accelerates, assembly workers need to frequently travel back and forth between the finished vehicles and the material racks, resulting in significant wasted movement. To solve this problem, the existing operation involves workers pushing spare parts trolleys along the moving line to the side of the finished vehicles, reducing the distance between materials and vehicles, thereby reducing wasted movement. However, due to the limited space around the production line, the width and space of the trolleys are restricted. After loading the required materials and tools, some materials and tools are difficult to retrieve or place, leading to increased time spent on retrieval and placement operations, making it difficult to meet the production pace. Summary of the Invention

[0003] The purpose of this invention is to provide a telescopic trolley to solve the problem of increased loading and unloading time caused by space constraints in existing trolleys.

[0004] This invention provides a telescopic trolley, including a toolbox, a frame, a telescopic assembly, and a traction assembly. The frame includes a column, the toolbox is fixedly connected to the telescopic assembly, the telescopic assembly includes a first telescopic frame, the first telescopic frame is slidably connected to the frame, and the traction assembly is disposed below the telescopic assembly. The traction assembly includes a traction rod and a traction cable, the traction rod is slidably connected to the column, and the traction cable can be connected to both the traction rod and the first telescopic frame simultaneously. When the traction rod slides downward, the traction cable pulls the first telescopic frame to slide outward toward the frame.

[0005] As a preferred technical solution for the telescopic trolley, the frame also includes a mounting rod, which is fixedly connected to the column. At least two traction wheels are fixedly installed on both the traction rod and the mounting rod. One end of the traction cable is fixedly installed on the mounting rod, and the traction cable is sequentially wound around multiple traction wheels on the traction rod and the mounting rod. The other end of the traction cable is fixedly installed on the first telescopic frame.

[0006] As a preferred technical solution for telescopic trolleys, two vertical support wheels are fixedly connected to both ends of the traction rod, and the two vertical support wheels are respectively rolledly connected to both sides of the column.

[0007] As a preferred technical solution for telescopic trolleys, the traction assembly also includes a first driving component, which is fixedly connected to the frame and can drive the traction rod to slide along the column.

[0008] As a preferred technical solution for the telescopic trolley, the telescopic assembly also includes support columns and support rails. The support columns are fixedly connected to the first telescopic frame, and the two ends of the support rails are fixedly connected to two columns respectively. Two horizontal bars are fixedly connected to the support columns in the vertical direction, and horizontal support wheels are fixedly connected to both ends of the horizontal bars. The horizontal support wheels are in rolling connection with the support rails.

[0009] As a preferred technical solution for telescopic trolleys, a guide sleeve is fixedly connected to the frame, and a guide rod is fixedly connected to the first telescopic frame, with the guide rod and guide sleeve being slidably connected.

[0010] As a preferred technical solution for the telescopic trolley, the telescopic assembly also includes a second telescopic frame, which is disposed above the first telescopic frame. The second telescopic frame is slidably connected to the first telescopic frame and is fixedly connected to the toolbox.

[0011] As a preferred technical solution for the telescopic trolley, the telescopic assembly also includes a second drive component, a slider, and a slide rail. The second drive component is fixedly connected to the first telescopic frame, the slider is fixedly connected to the second telescopic frame, the slide rail is fixedly connected to the first telescopic frame, and the slider is slidably connected to the slide rail. The second drive component can drive the slider to slide along the slide rail.

[0012] As a preferred technical solution for the telescopic trolley, the telescopic assembly also includes a bracket. The top of the bracket is fixedly connected to the second telescopic frame, and the bottom of the bracket is fixedly connected to an angle support wheel. The angle support wheel is rotatably connected to the column. Both the column and the bracket are equipped with hanging wheels, and the two hanging wheels are connected by an elastic belt. When the telescopic assembly slides towards the outside of the frame, the angle support wheel rolls upward along the column. When the telescopic assembly slides towards the inside of the frame, the angle support wheel rolls downward along the column.

[0013] As a preferred technical solution for the telescopic trolley, the telescopic trolley also includes a reset assembly, which includes a counterweight, a support plate, and a reset cable. The support plate is fixedly connected to the frame, the counterweight can be placed on the support plate, one end of the reset cable is connected to the counterweight, and the other end of the reset cable is fixedly connected to the toolbox. When the telescopic assembly slides toward the outside of the frame, the reset cable lifts the counterweight.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention provides a telescopic trolley, including a toolbox, a frame, a telescopic assembly, and a traction assembly. The frame includes a column, the toolbox is fixedly connected to the telescopic assembly, the telescopic assembly includes a first telescopic frame slidably connected to the frame, and the traction assembly is located below the telescopic assembly. The traction assembly includes a traction rod and a traction cable. The traction rod is slidably connected to the column, and the traction cable can be connected to both the traction rod and the first telescopic frame simultaneously. When the traction rod slides downward, the traction cable pulls the first telescopic frame to slide outward toward the frame. Operating the traction rod to slide downward causes the telescopic assembly to slide outward toward the frame, causing the toolbox to extend. The extended toolbox is closer to the trolley, allowing operators to quickly retrieve and place the required materials and tools, saving time and ensuring production cycle time. Attached Figure Description

[0016] Figure 1 This is one of the structural schematic diagrams of the telescopic trolley in the extended state in an embodiment of the present invention;

[0017] Figure 2 This is the second structural schematic diagram of the telescopic trolley in the extended state in an embodiment of the present invention;

[0018] Figure 3 This is one of the structural schematic diagrams of the telescopic trolley in its retracted state in an embodiment of the present invention;

[0019] Figure 4 This is the second structural schematic diagram of the telescopic trolley in the retracted state in an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the telescopic trolley in the extended state with the toolbox hidden, as shown in this embodiment of the invention.

[0021] Figure 6 This is a schematic diagram of the telescopic trolley in the extended state with the toolbox and reset assembly hidden in an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the telescopic component and the traction component in an embodiment of the present invention.

[0023] In the picture:

[0024] 1. Frame; 11. Mounting rod; 121. First upright; 122. Second upright; 131. Vertical support wheel; 132. Horizontal support wheel; 133. Angular support wheel; 134. Gravity support wheel; 14. Guide sleeve; 15. Roller wheel;

[0025] 21. Support column; 22. Support rail; 23. First telescopic frame; 24. Second telescopic frame; 25. Guide rod; 26. Slide rail; 27. Slider; 28. Second drive component; 29. ​​Bracket;

[0026] 31. First driving component; 32. Traction rod; 33. Traction wheel; 34. Traction cable; 35. Pull ring;

[0027] 41. Counterweight; 42. Reset wheel; 43. Support plate; 44. Reset cable; 45. Reset support column; 46. Counterweight frame;

[0028] 5. Tool box. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In current automobile production processes, various material racks are set up around the production line to hold the materials required for production. However, as the production pace gradually accelerates, assembly workers need to frequently travel back and forth between the finished vehicles and the material racks, resulting in significant wasted movement. To solve this problem, the existing operation involves workers pushing spare parts trolleys along the moving line to the side of the finished vehicles, reducing the distance between materials and vehicles, thereby reducing wasted movement. However, due to the limited space around the production line, the width and space of the trolleys are restricted. After loading the required materials and tools, some materials and tools are difficult to retrieve or place, leading to increased time spent on retrieval and placement operations, making it difficult to meet the production pace.

[0034] In response, this embodiment provides a telescopic trolley, which can also avoid wasted movement and solve the above-mentioned problems.

[0035] like Figures 1-4 As shown, this invention provides a telescopic trolley, which includes a toolbox 5, a frame 1, a telescopic assembly, and a traction assembly. The frame 1 includes a column. The toolbox 5 is fixedly connected to the telescopic assembly. The telescopic assembly includes a first telescopic frame 23, which is slidably connected to the frame 1. The traction assembly is located below the telescopic assembly and includes a traction rod 32 and a traction cable 34. The traction rod 32 is slidably connected to the column, and the traction cable 34 can be connected to both the traction rod 32 and the first telescopic frame 23 simultaneously. When the traction rod 32 slides downward, the traction cable 34 pulls the first telescopic frame 23 to slide outward toward the frame 1. By operating the traction rod 32 to slide downward, the telescopic assembly slides outward toward the frame 1, causing the toolbox 5 to extend. The extended toolbox 5 is closer to the vehicle, allowing operators to quickly retrieve and place the required materials and tools, saving time and ensuring production rhythm.

[0036] Specifically, the frame 1 has a cuboid or cube frame structure. The uprights include a first upright 121 and a second upright 122. The first upright 121 supports the toolbox 5 and the telescopic assembly, while the second upright 122 supports the traction assembly. It is understood that since the traction assembly is located below the telescopic assembly, the height of the second upright 122 is less than the height of the first upright 121. Two second uprights 122 are provided, one on each side of the frame 1. In practical applications, the extension direction of the telescopic assembly is determined by the position of the trolley. For example, if the trolley is on the left side of the production line and the product car is on the right side, the telescopic assembly needs to extend to the right. Conversely, if the trolley is on the right side of the production line, the telescopic assembly needs to extend to the left. The structures are the same; the only difference is the extension direction of the telescopic assembly. Therefore, for ease of explanation, the following description will use the trolley being on the left side of the production line as an example. Correspondingly, the direction in which the telescopic assembly slides outward from the frame 1, i.e., the extension direction, is the right side of the trolley.

[0037] Optionally, to allow for a longer rightward sliding stroke of the telescopic assembly, the traction cable 34 is connected to the first telescopic frame 23 on the left side of the first telescopic frame 23. Correspondingly, a pull ring 35 is fixedly installed on the left side of the first telescopic frame 23, and the traction cable 34 is fixedly connected to the pull ring 35. The traction cable 34 is connected to the tow bar 32 on the right side of the tow bar 32. Thus, when the tow bar 32 slides downward, the traction cable 34 and the first telescopic frame 23 slide at an angle. The component of the force of the traction cable 34 in this direction drives the first telescopic frame 23 to slide to the right until the component of the force disappears when the traction cable 34 is perpendicular to this direction. At this time, the first telescopic frame 23 is fully extended from the frame 1, above the left side of the first telescopic frame 23 and the right side of the tow bar 32. When it is necessary to retract the first telescopic frame 23, push the first telescopic frame 23 to slide to the left, and the traction cable 34 drives the tow bar 32 to slide upward. To avoid wear between the traction cable 34 and the first telescopic frame 23 and tow bar 32 during frequent extension and retraction, pulleys can be installed at appropriate positions for transition to reduce wear.

[0038] Furthermore, such as Figure 6As shown, during the process of the first telescopic frame 23 sliding to the right and until it is fully extended, the traction rod 32 needs to slide downward a relatively long distance, correspondingly requiring the trolley to be set at a relatively high height. Therefore, in this embodiment, an installation rod 11 is also provided to cooperate with the traction rod 32 to improve the compactness of the structure. Two second columns 122 are symmetrically arranged on both sides of the frame 1, and the top ends of the two second columns 122 are fixedly connected to the first column 121 through a horizontal connecting rod. An installation rod 11 is fixedly connected between the two second columns 122, the installation rod 11 is located above the traction rod 32, the installation rod 11 is arranged along the width direction of the frame 1 and is fixedly connected to the top end of the second column 122. Multiple traction wheels 33 are fixedly provided on both the installation rod 11 and the traction rod 32, the axle of the traction wheel 33 is fixedly connected to the installation rod 11 or the traction rod 32, and the rim of the traction wheel 33 is rotatably connected to the axle of the traction wheel 33. In this embodiment, preferably, two traction wheels 33 are fixedly provided on both the installation rod 11 and the traction rod 32. One end of the traction cable 34 is fixedly mounted on the mounting rod 11. Correspondingly, a pull ring 35 is also fixedly mounted on the mounting rod 11. One end of the traction cable 34 is fixedly connected to the pull ring 35 on the mounting rod 11. The traction cable 34 is sequentially wound around multiple traction wheels 33 on the traction rod 32 and the mounting rod 11. The other end of the traction cable 34 is fixedly connected to the pull ring 35 on the first telescopic assembly. The mounting rod 11, the traction rod 32, the multiple traction wheels 33, and the traction cable 34 together form a movable pulley system. With this configuration, the first telescopic frame 23 is driven to slide to the right by the same distance, and the distance that the traction rod 32 needs to slide down is greatly reduced.

[0039] Understandably, when the traction rod 32 directly pulls the first telescopic component to slide to the right via the traction cable 34, in the initial position, the traction cable 34, the column, and the first telescopic component form a right-angled triangle. The traction cable 34 corresponds to the hypotenuse of the right-angled triangle, and the section of the column between the first telescopic component and the traction rod 32 is the vertical right-angle side. After the sliding stops, the traction cable 34 is perpendicular to the first telescopic component, and the traction rod 32 slides downwards. The distance between the first telescopic component and the traction rod 32 is equal to the length of the traction cable 34. Correspondingly, the distance between the hypotenuse and the vertical right-angle side of the right-angled triangle formed by the three components in the initial position can be determined as the distance the traction rod 32 needs to slide downwards during the process of the first telescopic component moving from the initial position to full extension. The movable pulley system with multiple traction wheels 33 has two movable pulleys. When the traction rod 32 moves downward, the traction wheels 33 on the traction rod 32 act as movable pulleys, while the traction wheels 33 on the mounting rod 11 act as fixed pulleys. Correspondingly, since two traction wheels 33 are provided on the traction rod 32 in this embodiment, the movable pulley system formed by the mounting rod 11, the traction rod 32, the multiple traction wheels 33, and the traction cable 34 has two movable pulleys. For example, if the traction rod 32 slides downward by 3 cm, the traction cable 34, which is fixedly connected to the first telescopic component, needs to move 12 cm. Under the same requirements, the solution that introduces the mounting rod 11 and multiple traction wheels 33 requires the traction rod 32 to slide downward by a shorter distance. The structure is also more compact.

[0040] Optionally, the traction rod 32 and the second column 122 can be slidably connected via a groove or dovetail groove, or by providing support wheels that roll along the second column 122; the latter is preferred in this embodiment. Each end of the traction rod 32 is fixedly connected to two vertical support wheels 131. The axle of the vertical support wheel 131 is fixedly connected to the traction rod 32, and the rim of the vertical support wheel 131 is rotatably connected to its axle. The two vertical support wheels 131 are respectively slidably connected to both sides of the second column 122, and both sides of the second column 122 can engage with the outer contour of the rim of the vertical support wheel 131. When the traction rod 32 slides downwards, the vertical support wheels 131 roll downwards along the second column 122. Meanwhile, since each end of the traction rod 32 has two vertical support wheels 131 that simultaneously contact the second column 122, and the second column 122, the traction rod 32, and the vertical support wheels 131 have high rigidity, it can be ensured that the traction rod 32 will not tilt during the sliding process, thus ensuring the accuracy of the action.

[0041] Optionally, the traction assembly further includes a first drive member 31, which is fixedly connected to the frame 1. The first drive member 31 can drive the traction rod 32 to slide along the column. In this embodiment, the first drive member 31 can be a combination of a geared motor and a gear and rack transmission mechanism, which drives the traction rod 32 to slide along the column through the rack. The first drive member 31 can also be a cylinder or an electric push rod, whose output end directly drives the traction rod 32 to slide along the column. Considering that air sources are readily available and low in cost in practical application environments, this embodiment preferably uses a cylinder as the first drive member 31. The output end of the cylinder is fixedly connected to the traction rod 32. When air is supplied to the cylinder, the output end of the cylinder retracts, driving the traction rod 32 to slide downward, thereby causing the first telescopic assembly to extend to the right.

[0042] Furthermore, such as Figures 5-7 As shown, the telescopic assembly also includes a support column 21 and a support rail 22. The support column 21 is fixedly connected to the left side of the first telescopic frame 23. The support rail 22 is positioned above the mounting rod 11, and both ends of the support rail 22 are fixedly connected to the first column 121. The left side of the support column 21 is fixedly connected to a pull ring 35. Two horizontal support units are fixedly connected to the support column 21, and the two horizontal support units are arranged vertically. Each horizontal support unit includes a connecting rod and two horizontal support wheels 132, both of which are fixedly connected to the connecting rod. The axle of the horizontal support wheel 132 is fixedly connected to the connecting rod, and the rim of the horizontal support wheel 132 is rotatably connected to the axle of the horizontal support wheel 132. The two horizontal support wheels 132 are simultaneously rolled to the upper or lower end of the support rail 22, and both the upper and lower ends of the support rail 22 can mate with the outer edge of the rim of the horizontal support wheel 132. The spacing between the two horizontal support units is the same as the width of the support rail 22. During the sliding of the first telescopic frame 23 to the right, the four horizontal support wheels 132 of the two horizontal support units roll on the support rail 22, ensuring that the vertical position of the first telescopic frame 23 does not change during the sliding process, thus preventing the materials or tools in the toolbox 5 from falling off due to the vibration of the telescopic frame.

[0043] Optionally, such as Figures 6-7 A guide rod 25 is fixedly connected to the first telescopic frame 23, and a guide sleeve 14 is fixedly connected to the first column 121. The guide rod 25 and the guide sleeve 14 are slidably connected, and the extended lines of the axes of the guide rod 25 and the guide sleeve 14 are parallel to or coincide with the sliding direction of the first telescopic frame 23. During the sliding process of the first telescopic frame 23, the guide rod 25 and the guide sleeve 14 cooperate to prevent the first telescopic frame 23 from shifting.

[0044] Optionally, to further increase the compactness of the structure, the telescopic assembly also includes a second telescopic frame 24, which is positioned above the first telescopic frame 23. The second telescopic frame 24 is slidably connected to the first telescopic frame 23, and the toolbox 5 is fixedly connected to the second telescopic frame 24. A second driving member 28 is fixedly connected to the first telescopic frame 23, which can drive the second telescopic frame 24 to slide along the first telescopic frame 23 in the same or parallel direction. The second driving member 28 can be a combination of a geared motor and a rack and pinion transmission mechanism, which drives the second telescopic frame 24 to slide along the sliding direction of the first telescopic frame 23 via the rack. The second driving member 28 can also be a cylinder or an electric push rod, whose output end directly drives the second telescopic frame 24 to slide along the sliding direction of the first telescopic frame 23. Considering that air sources are readily available and inexpensive in practical applications, this embodiment preferably uses a cylinder as the second driving member 28. The output end of the cylinder is fixedly connected to the first telescopic frame 23. When air is supplied to the cylinder, the output end of the cylinder extends, driving the second telescopic frame 24 to extend to the right. With the second telescopic frame 24 in place, when the first telescopic frame 23 extends to the right, the support column 21 does not need to slide to the far right. The second telescopic frame 24 can then continue to extend to the right based on the first telescopic frame 23, which can also meet the usage requirements. Since the first telescopic frame 23 does not need to be slid to the far right, the required distance for the traction rod 32 to move downward is further reduced, so the structure of the telescopic trolley can be more compact.

[0045] Furthermore, such as Figures 6-7 As shown, since the second telescopic frame 24 needs to support the weight of the toolbox 5 and related materials or tools, a slide rail 26 and a slider 27 are provided between the second telescopic frame 24 and the first telescopic frame 23 to ensure the reliability of the sliding of the second telescopic frame 24 on the first telescopic frame 23. The slider 27 is fixedly sleeved on the first telescopic frame 23, and the slide rail 26 is welded to the second telescopic frame 24, with the slider 27 and the slide rail 26 slidably connected. The slide rail 26 is provided with a dovetail groove. The dovetail groove not only ensures the reliability of the sliding connection but also prevents the second telescopic frame 24 from changing its vertical position or shifting during the sliding process.

[0046] Optionally, such as Figures 1-7To prevent the second telescopic frame 24 from deforming due to excessive weight, the telescopic assembly also includes a bracket 29. The bracket 29 is preferably a square frame structure consisting of two short rods and two long rods. The short rods at the top of the bracket 29 are fixedly connected to the second telescopic frame 24 and are rotatably connected relative to the two long rods. Angle support wheels 133 are fixedly connected to the bottom of the bracket 29. The axles of the angle support wheels 133 are fixedly connected to the long rods of the bracket 29, and the rims of the angle support wheels 133 are rotatably connected to their axles. The two angle support wheels 133 are rollingly connected to the two first columns 121. Hanging wheels 15 are fixedly connected to both long rods of the bracket 29 and to the first columns 121. The hanging wheels 15 on the bracket 29 and the hanging wheels 15 on the first columns 121 are connected by an elastic band (not shown in the figure). The telescopic trolley has an extended state and a retracted state. In the extended state, both the first and second retracted frames slide to the right, causing the short rod at the top of the support 29 to move to the right. This increases the angle between the support 29 and the first column 121. Under the action of the elastic band, the elastic band pulls the hanging wheel 15 on the support 29, ensuring that the angle support wheel 133 at the bottom of the support 29 remains in contact with the first column 121. This causes the angle support wheel 133 at the bottom of the support 29 to roll upwards along the first column 121 and support the second telescopic frame 24. In the retracted state, both the first and second retracted frames slide to the left, causing the short rod at the top of the support 29 to move to the left. This decreases the angle between the support 29 and the column. The angle support wheel 133 rolls downwards along the first column 121, causing the support 29 to rest against the frame 1, reducing space occupation.

[0047] Furthermore, such as Figures 1-5As shown, the telescopic trolley also includes a reset assembly. The reset assembly includes a counterweight 41, a reset wheel 42, a support plate 43, a reset cable 44, a reset support column 45, and a counterweight frame 46. The reset support column 45 is fixedly connected to the frame 1 and is located on the left side of the toolbox 5, with its top higher than the top of the toolbox 5. A reset wheel 42 is fixedly mounted on the top of the reset support column 45, with its axle fixedly connected to the reset support column 45 and its rim rotatably connected to its axle. The counterweight frame 46 is slidably connected to the first column 121. A support plate 43 is fixedly connected to the bottom of the frame 1, allowing the counterweight 41 to be placed on the support plate 43. The counterweight frame 46 is fixedly connected to the counterweight 41. One end of the reset cable 44 is connected to the counterweight 41 via the counterweight frame 46, and after winding around the counterweight wheel, the other end of the reset cable 44 is fixedly connected to the toolbox 5. The counterweight frame 46 includes a vertical connecting rod and two horizontal connecting rods, each fixedly connected to both ends of the vertical connecting rod. Gravity support wheels 134 are fixedly mounted at both ends of each horizontal connecting rod. The axles of the gravity support wheels 134 are fixedly connected to the horizontal connecting rods, and the rims of the gravity support wheels 134 are rotatably connected to their axles. The two gravity support wheels 134 are rollingly connected to both sides of the first column 121, and both sides of the first column 121 can engage with the outer edges of the rims of the gravity support wheels 134. The counterweight frame 46 ensures that the counterweight block 41 will not deflect or tilt during its lifting and lowering process.

[0048] Specifically, when the telescopic assembly slides outward toward the frame 1, the reset cable 44 lifts the counterweight 41. Air is supplied to the cylinder connected to the traction rod 32, causing it to pull the traction rod 32 downward. The pull ring 35 located on the left side of the first telescopic frame 23 is pulled to the right side of the frame 1 via the traction cable 34. Air is supplied to the cylinder connected to the second telescopic frame 24, causing it to push the second telescopic frame 24 to slide to the right. This causes the angle support wheel 133 at the bottom of the bracket 29 to roll upward along the first column 121, thereby causing the toolbox 5 to extend to the right. During the sliding of the toolbox 5 to the right, the reset cable 44 pulls the counterweight frame 46 upward via the reset wheel 42, causing the counterweight 41 fixedly connected to it to rise. The telescopic trolley is in the extended state. When the toolbox 5 needs to be retracted, the air supply to the cylinders connected to the second telescopic frame 24 and the traction rod 32 is cut off. This causes the counterweight 41 to descend, pulling the counterweight frame 46 downwards. The counterweight frame 46 pulls the reset cable 44, causing the toolbox 5 to retract to the left. The second telescopic frame 24 slides to the left, causing the angle support wheel 133 at the bottom of the bracket 29 to roll downwards along the first column 121. The first telescopic frame 23 slides to the left, and the traction cable 34 pulls the traction rod 32 upwards. The support plate 43 prevents the counterweight from falling directly to the ground. Furthermore, by adjusting the position of the support plate 43, the telescopic trolley is in the retracted state when the counterweight 41 falls onto it. The telescopic trolley switches from the extended state to the retracted state via the reset assembly; therefore, only unidirectional drive cylinders are needed. Correspondingly, a device that only controls the air supply on / off can be installed on the trolley to achieve extension, and the reset assembly will achieve retraction. If a bidirectional drive cylinder is installed, although a reset component is not required for retraction, a bidirectional drive cylinder requires not only a device to control the on / off of the air supply, but also a device to switch the air supply. Operators may misoperate and cause the toolbox 5 to fail to extend or retract.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A retractable dolly characterized by, The utility model relates to a kind of tool box (5);Frame (1), the frame (1) includes column; Telescopic component, the telescopic component includes first telescopic frame (23), second telescopic frame (24) and support (29), the first telescopic frame (23) is slidably connected with the frame (1), the first telescopic frame (23) slides towards left side or right side of frame, the second telescopic frame (24) is arranged above the first telescopic frame (23), the second telescopic frame (24) is slidably connected with the first telescopic frame (23), the second telescopic frame (24) is fixedly connected with the tool box (5), the second telescopic frame (24) is consistent with the direction of the first telescopic frame (23) sliding along the direction of the first telescopic frame (23) sliding, the top of the support (29) is fixedly connected with the second telescopic frame (24), the bottom of the support (29) is fixedly connected with angle support wheel (133), the angle support wheel (133) is rollably connected with the column; Traction component, the traction component is arranged below the telescopic component, the traction component includes traction rod (32) and traction cable (34), the traction rod (32) is slidably connected with the column, the traction cable (34) can be connected with the traction rod (32) and the first telescopic frame (23) simultaneously, when the traction rod (32) slides downwards, the traction cable (34) pulls the first telescopic frame (23) and slides towards the outside of the frame (1). The frame (1) further includes mounting rod (11), the mounting rod (11) is fixedly connected with the column, at least two traction wheels (33) are fixedly arranged on the traction rod (32) and the mounting rod (11), one end of the traction cable (34) is fixedly arranged on the mounting rod (11), the traction cable (34) is sequentially wound around multiple traction wheels (33) on the traction rod (32) and the mounting rod (11) respectively, the other end of the traction cable (34) is fixedly arranged on the first telescopic frame (23). Both ends of the traction rod (32) are fixedly connected with two vertical support wheels (131), and the two vertical support wheels (131) are rollably connected with both sides of the column respectively.

2. The telescoping dolly of claim 1, wherein, The traction component further includes first driving member (31), the first driving member (31) is fixedly connected with the frame (1), and the first driving member (31) can drive the traction rod (32) to slide along the column.

3. The telescoping dolly of claim 2, wherein, The telescopic component further includes support column (21) and support rail (22), the support column (21) is fixedly connected with the first telescopic frame (23), both ends of the support rail (22) are fixedly connected with two columns respectively, two horizontal rods are fixedly connected in vertical direction on the support column (21), both ends of the horizontal rod are fixedly connected with horizontal support wheel (132), and the horizontal support wheel (132) is rollably connected with the support rail (22).

4. The telescoping dolly of claim 3, wherein, ​ 5. The telescoping dolly of claim 1, wherein, ​ 6. The telescoping dolly of claim 1, wherein, The frame (1) is fixedly connected with a guide sleeve (14), the first telescopic frame (23) is fixedly connected with a guide rod (25), and the guide rod (25) is in sliding connection with the guide sleeve (14).

7. The telescoping dolly of claim 1, wherein, The telescopic assembly further comprises a second driving member (28), a sliding block (27) and a sliding rail (26), the second driving member (28) is fixedly connected with the first telescopic frame (23), the sliding block (27) is fixedly connected with the second telescopic frame (24), the sliding rail (26) is fixedly connected with the first telescopic frame (23), the sliding block (27) is in sliding connection with the sliding rail (26), and the second driving member (28) can drive the sliding block (27) to slide along the sliding rail (26).

8. The telescoping dolly of claim 7, wherein, The stand column and the support (29) are both provided with a hanging wheel (15), the two hanging wheels (15) are connected through an elastic belt, when the telescopic assembly slides towards the outside of the frame (1), the angle supporting wheel (133) rolls upwards along the stand column, and when the telescopic assembly slides towards the inside of the frame (1), the angle supporting wheel (133) rolls downwards along the stand column.

9. The pantograph of any of claims 1-8, wherein, The telescopic trolley further comprises a reset assembly, the reset assembly comprises a counterweight (41), a support plate (43) and a reset cable (44), the support plate (43) is fixedly connected with the frame (1), the counterweight (41) can be placed on the support plate (43), one end of the reset cable (44) is connected with the counterweight (41), and the other end of the reset cable (44) is fixedly connected with the tool box (5); when the telescopic assembly slides towards the outside of the frame (1), the reset cable (44) lifts the counterweight (41).

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