Transfer trolley having two-stage lifting / lowering function

Abstract

A transfer trolley having a two-stage lifting / lowering function, comprising a transfer trolley, wherein a first-stage lifting / lowering device is provided on a chassis of the transfer trolley; a first-stage platform is arranged at the top end of the first-stage lifting / lowering device; a second-stage bearing frame is mounted at the bottom end of the first-stage platform; a recess is formed on the first-stage platform at a position corresponding to the second-stage bearing frame; a second-stage lifting / lowering device is provided on the second-stage bearing frame; a second-stage platform is arranged at the top end of the second-stage lifting / lowering device; and the second-stage platform is matched with the recess in shape. The two-stage lifting / lowering structure can adapt to a larger range of vehicle ground clearance, and there is no need to design a variety of battery swapping trolleys for different vehicle models, thereby reducing production costs and operational complexity. The first-stage platform and the second-stage platform can be lifted and lowered at the same time, thereby shortening the lifting / lowering time, and improving the overall battery swapping efficiency.

Description

A transfer trolley with two-stage lifting function Technical Field

[0001] This utility model relates to the field of electric vehicle battery swapping technology, and in particular to a transfer trolley with two-stage lifting function. Background Technology

[0002] With the rapid development of new energy vehicles, battery swapping technology, as a convenient and efficient charging method, has gradually attracted attention. As the core equipment in the battery swapping process, the performance and efficiency of the battery swapping device directly affect the battery swapping experience and the operational efficiency of the battery swapping station.

[0003] Currently, most existing battery swapping vehicles use a single-layer lifting structure to pick up and place batteries. While this structure can perform basic battery swapping functions, it has the following drawbacks:

[0004] Poor compatibility: For vehicles with high ground clearance, the single-layer lifting structure requires a long cross arm to reach the battery, which limits the adaptability of the battery swapping vehicle to different vehicle models.

[0005] Low efficiency: The lifting speed of the single-layer lifting structure is slow, resulting in a longer battery swapping time and reducing the operating efficiency of the battery swapping station.

[0006] Large space occupation: In order to accommodate vehicles of different heights, the single-layer lifting structure requires a long cross arm, which increases the length of the battery swapping vehicle and the floor area occupied, limiting the space utilization rate of the battery swapping station.

[0007] Utility Model Content

[0008] The purpose of this invention is to provide a transfer trolley with two-stage lifting function to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following solution:

[0010] A transfer trolley with two-stage lifting function includes a transfer trolley, wherein a first-stage lifting device is provided on the chassis of the transfer trolley.

[0011] The top of the primary lifting device is provided with a primary platform, and the bottom of the primary platform is provided with a secondary load-bearing frame. A notch is provided on the primary platform at the position corresponding to the secondary load-bearing frame.

[0012] The secondary load-bearing frame is equipped with a secondary lifting device, and the top of the secondary lifting device is equipped with a secondary platform, the shape of which is adapted to the shape of the notch.

[0013] Furthermore, the primary lifting device includes two sets of correspondingly arranged first cross arms and a primary drive mechanism;

[0014] The top end of the first cross arm is hinged to the bottom end of the primary platform;

[0015] The first upper rolling component is connected to the other end of the top of the first cross arm;

[0016] A first upper rolling seat is installed at the bottom of the first-level platform at a position corresponding to the first upper rolling component, and the first upper rolling component is arranged inside the first upper rolling seat.

[0017] One end of the bottom of the first cross arm is hinged to the chassis of the transfer trolley;

[0018] The other end of the bottom of the first cross arm is connected to a first lower rolling component;

[0019] A first lower rolling seat is installed on the chassis of the transfer trolley at a position corresponding to the first lower rolling component, and the first lower rolling component is arranged inside the first lower rolling seat.

[0020] The first upper rolling seat corresponds to the first lower rolling seat in position;

[0021] The primary drive mechanism is mounted on the chassis of the transfer trolley and is connected to the wall of the two sets of the first cross arms near the first lower rolling seat.

[0022] The driving direction of the first-stage drive mechanism is the same as the arrangement direction of the first lower rolling seat.

[0023] Furthermore, the primary drive mechanism includes a primary drive motor, a primary lead screw, a primary connecting plate, and two sets of primary sliding components;

[0024] The primary drive motor and the primary lead screw are both mounted on the chassis of the transfer trolley and connected in a transmission manner. The transmission direction of the primary lead screw is the same as the mounting direction of the first lower rolling seat.

[0025] The two sets of primary sliding components are respectively arranged near the two first lower rolling seats. Each primary sliding component includes a primary guide rail and a primary slider that slide and cooperate with each other. The arrangement direction of the primary guide rail is the same as the arrangement direction of the first lower rolling seats.

[0026] The body of the primary connecting plate is connected to the primary lead screw, and both ends of the body of the primary connecting plate are respectively connected to the two primary sliders;

[0027] The primary connecting plate also connects to the wall of the two sets of the first cross arms near the first lower rolling seat.

[0028] Furthermore, an auxiliary cross arm is provided between the chassis of the transfer trolley and the primary platform.

[0029] Furthermore, the secondary lifting device includes two sets of correspondingly arranged second cross arms and a secondary drive mechanism;

[0030] The top end of the second cross arm is hinged to the bottom end of the secondary platform;

[0031] The other end of the top of the second cross arm is hinged to a secondary upper slider. A secondary upper slide rail is installed at the bottom of the secondary platform at a position corresponding to the secondary upper slider. The secondary upper slider and the secondary upper slide rail slide in a sliding engagement.

[0032] The bottom end of the second cross arm is hinged to the secondary load-bearing frame;

[0033] The other end of the bottom of the second cross arm is hinged to a secondary lower slider. A secondary lower slide rail is installed on the secondary bearing frame at a position corresponding to the secondary lower slider. The secondary lower slider and the secondary lower slide rail slide in a sliding engagement.

[0034] The upper secondary slide rail and the lower secondary slide rail are positioned correspondingly;

[0035] The secondary drive mechanism is disposed on the secondary load-bearing frame and is respectively connected to the two sets of the second cross arms;

[0036] The driving direction of the secondary drive mechanism is the same as the layout direction of the secondary lower slide rail.

[0037] Furthermore, the secondary drive mechanism includes a secondary drive motor, a secondary lead screw, a secondary connecting plate, a wedge block, and two sets of secondary sliding components;

[0038] The secondary drive motor and the secondary lead screw are both arranged on the secondary bearing frame and connected by transmission. The transmission direction of the secondary lead screw is the same as the arrangement direction of the secondary lower slide rail.

[0039] Two sets of secondary sliding components are respectively arranged between two sets of second cross arms. Each secondary sliding component includes a secondary guide rail and a secondary slider that slide together. The arrangement direction of the secondary guide rail is the same as the arrangement direction of the secondary lower slide rail.

[0040] The body of the secondary connecting plate is connected to the secondary lead screw, and the end of the secondary connecting plate away from the secondary lead screw is connected to the inclined block. The inclined block is connected to two of the secondary sliders respectively.

[0041] The middle ends of the two sets of second cross arms are connected by a connecting rod, and the connecting rod is provided with a rotating wheel, which contacts the inclined surface of the inclined block.

[0042] Furthermore, the secondary lifting device includes four sets of secondary lifting components arranged sequentially around the perimeter of the secondary load-bearing frame;

[0043] The secondary lifting component includes a secondary electric push rod, a lifting section guide rail, a lifting section slider, a lifting section hinge seat, a lifting section first hinge rod, and a lifting section second hinge rod.

[0044] The lifting section guide rail and the lifting section slider are slidably engaged and arranged within the secondary load-bearing frame, and the lifting section hinge seat is connected to the lifting section slider;

[0045] One end of the first hinge rod of the lifting part is hinged in the hinge seat of the lifting part, and the other end of the first hinge rod of the lifting part is hinged to the bottom end of the secondary platform.

[0046] One end of the second hinge rod of the lifting part is hinged to the rod body of the first hinge rod of the lifting part, and the other end of the second hinge rod of the lifting part is hinged to the secondary load-bearing frame;

[0047] The output end of the secondary electric push rod is connected to the lifting section hinge seat.

[0048] Furthermore, sensing components are respectively arranged at the four corners of the secondary platform, and the four secondary electric push rods are connected to the four sensing components one by one through the control unit.

[0049] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of this utility model are as follows:

[0050] Enhanced compatibility: The two-stage lifting structure can adapt to a wider range of vehicle ground clearances, eliminating the need to design multiple battery swapping vehicles for different vehicle models, thus reducing production costs and operational complexity.

[0051] More efficient: The primary and secondary platforms can be raised and lowered simultaneously, shortening the raising and lowering time and thus improving the overall battery swapping efficiency.

[0052] Smaller size: The battery swapping vehicle is smaller and more flexible, making it easier to operate in limited spaces, as it does not require a long cross arm to accommodate vehicles with high ground clearance.

[0053] Enhanced adaptability: It can accept battery compartments or batteries in non-horizontal positions. After the sensor on the secondary platform detects the battery compartment, it stops pushing. It can also install new batteries back according to the angle when the battery compartment is accepted, without causing installation errors due to tilting. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 is a schematic diagram of the overall structure of the transfer trolley with two-stage lifting function in an embodiment of this utility model;

[0056] Figures 2 and 3 are schematic diagrams of the first-stage lifting device in the embodiment of this utility model;

[0057] Figure 4 is a structural schematic diagram of a two-stage lifting device in an embodiment of this utility model;

[0058] Figure 5 is a schematic diagram of another structure of the two-stage lifting device in an embodiment of this utility model.

[0059] Explanation of reference numerals in the attached drawings: 1. Transfer trolley; 2. Primary lifting device; 21. First crossarm; 22. Primary drive mechanism; 221. Primary drive motor; 222. Primary lead screw; 223. Primary connecting plate; 224. Primary sliding assembly; 23. First upper rolling component; 24. First upper rolling seat; 25. First lower rolling component; 26. First lower rolling seat; 3. Primary platform; 31. Notch; 4. Secondary load-bearing frame; 5. Secondary lifting device; 51. Second crossarm; 52. Secondary drive mechanism; 521. Secondary drive motor; 522. Secondary lead screw; 523. Secondary connecting plate; 524. Inclined block; 525. Secondary sliding assembly; 53. Secondary upper slider; 54. Secondary upper slide rail; 55. Secondary lower slider; 56. Secondary lower slide rail; 57. Connecting rod; 58. Rotating wheel; 6. Secondary platform; 7. Auxiliary cross arm; 8. Secondary lifting component; 81. Secondary electric push rod; 82. Lifting section guide rail; 83. Lifting section slider; 84. Lifting section hinge seat; 85. Lifting section first hinge rod; 86. Lifting section second hinge rod; 9. Sensing component. Detailed Implementation

[0060] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0061] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 this application.

[0062] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0063] In the description of this application, it should be noted that, unless otherwise expressly 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0065] Example 1

[0066] Referring to Figure 1, a transfer trolley with two-stage lifting function includes a transfer trolley 1, and a first-stage lifting device 2 is provided on the chassis of the transfer trolley 1.

[0067] A primary platform 3 is provided at the top of the primary lifting device 2, and a secondary load-bearing frame 4 is installed at the bottom of the primary platform 3. A notch 31 is provided on the primary platform 3 at the position corresponding to the secondary load-bearing frame 4.

[0068] A secondary lifting device 5 is installed on the secondary load-bearing frame 4, and a secondary platform 6 is installed at the top of the secondary lifting device 5. The shape of the secondary platform 6 is adapted to the shape of the notch 31.

[0069] Specifically, the primary platform 3 is raised and lowered by the primary lifting device 2, and the secondary platform 6 is raised and lowered by the secondary upgrading device. This can accommodate a wider range of vehicle ground clearances, and the primary platform 3 and the secondary platform 6 can be raised and lowered simultaneously, shortening the lifting time and thus improving the overall battery swapping efficiency.

[0070] Specifically, the upper plane of the secondary platform 6 can coincide with the upper plane of the primary platform 3 through the gap 31, thus making the upper plane of the primary platform 3 a complete plane.

[0071] It should be noted that this utility model can be applied not only to receiving batteries, but also to receiving battery compartments (where the batteries are located).

[0072] Example 2

[0073] Referring to Figures 1, 2, and 3, the transfer trolley with two-stage lifting function provided in this embodiment differs from Embodiment 1 in that:

[0074] The primary lifting device 2 includes two sets of correspondingly arranged first cross arms 21 and a primary drive mechanism 22;

[0075] The top end of the first cross arm 21 is hinged to the bottom end of the first-level platform 3;

[0076] The other end of the top of the first cross arm 21 is connected to the first upper rolling component 23;

[0077] A first upper rolling seat 24 is installed at the bottom of the first platform 3 at a position corresponding to the first upper rolling component 23, and the first upper rolling component 23 is arranged inside the first upper rolling seat 24.

[0078] The bottom end of the first cross arm 21 is hinged to the chassis of the transfer trolley 1;

[0079] The bottom end of the first cross arm 21 is connected to the first lower rolling component 25;

[0080] A first lower rolling seat 26 is installed on the chassis of the transfer trolley 1 at a position corresponding to the first lower rolling component 25, and the first lower rolling component 25 is arranged inside the first lower rolling seat 26.

[0081] The first upper rolling seat 24 and the first lower rolling seat 26 are positioned correspondingly;

[0082] The first-stage drive mechanism 22 is mounted on the chassis of the transfer trolley 1 and is connected to the wall of the two sets of first cross arms 21 near the first lower rolling seat 26.

[0083] The driving direction of the first-stage drive mechanism 22 is the same as the arrangement direction of the first lower rolling seat 26.

[0084] Specifically, the first-stage drive mechanism 22 drives the two sets of first cross arms 21 to lift and lower, thereby driving the lifting and lowering of the first platform. The cooperation between the rolling components and the rolling seat ensures that the first cross arms 21 have sufficient displacement during lifting and lowering to ensure the normal operation of the lifting and lowering process.

[0085] It should be noted that the first-stage drive mechanism 22 can adopt the following structure:

[0086] The primary drive mechanism 22 includes a primary drive motor 221, a primary lead screw 222, a primary connecting plate 223, and two sets of primary sliding components 224;

[0087] The primary drive motor 221 and the primary lead screw 222 are both mounted on the chassis of the transfer trolley 1 and are connected by transmission. The transmission direction of the primary lead screw 222 is the same as the arrangement direction of the first lower rolling seat 26.

[0088] Two sets of primary sliding components 224 are respectively arranged near the two first lower rolling seats 26. Each primary sliding component 224 includes a primary guide rail and a primary slider that slide and cooperate with each other. The arrangement direction of the primary guide rail is the same as the arrangement direction of the first lower rolling seats 26.

[0089] The body of the primary connecting plate 223 is connected to the primary lead screw 222, and the two ends of the body of the primary connecting plate 223 are respectively connected to two primary sliders.

[0090] The primary connecting plate 223 also connects to the wall of the two sets of first cross arms 21 near the first lower rolling seat 26.

[0091] Specifically, the primary drive motor 221 drives the primary lead screw 222 to work, which in turn drives the primary connecting plate 223 to move. Because of the connection between the primary connecting plate 223 and the first cross arm 21, the bottom end of the first cross arm 21 is also displaced, thereby driving the extension and retraction of the first cross arm 21.

[0092] Based on this, in order to further improve the stability of the lifting process of the first-level platform 3, an auxiliary cross arm 7 can be set between the chassis of the transfer trolley 1 and the first-level platform 3. The specific connection and cooperation of the auxiliary cross arm 7 can be referred to the connection and cooperation relationship of the first cross arm 21 mentioned above, which will not be elaborated here.

[0093] Example 3

[0094] Referring to Figures 1 and 4, the transfer trolley with two-stage lifting function provided in this embodiment differs from that in Embodiment 1 in that:

[0095] The secondary lifting device 5 includes two sets of correspondingly arranged second cross arms 51 and a secondary drive mechanism 52;

[0096] The top end of the second cross arm 51 is hinged to the bottom end of the secondary platform 6;

[0097] The other end of the top of the second cross arm 51 is hinged to a secondary upper slider 53. A secondary upper slide rail 54 is installed at the bottom of the primary platform 3 at the position corresponding to the secondary upper slider 53. The secondary upper slider 53 and the secondary upper slide rail 54 slide in cooperation.

[0098] The bottom end of the second cross arm 51 is hinged to the secondary load-bearing frame 4;

[0099] The other end of the bottom of the second cross arm 51 is hinged to a secondary lower slider 55. A secondary lower slide rail 56 is installed on the secondary bearing frame 4 at a position corresponding to the secondary lower slider 55. The secondary lower slider 55 and the secondary lower slide rail 56 slide in cooperation.

[0100] The upper secondary slide rail 54 and the lower secondary slide rail 56 are positioned correspondingly;

[0101] The secondary drive mechanism 52 is mounted on the secondary load-bearing frame 4 and is connected to two sets of second cross arms 51 respectively;

[0102] The driving direction of the secondary drive mechanism 52 is the same as the layout direction of the secondary lower slide rail 56.

[0103] Specifically, the two sets of second cross arms 51 are driven to extend and retract by the secondary drive mechanism 52, thereby driving the second platform to rise and fall. The cooperation between the secondary lower slider 55 and the secondary lower slide rail 56 ensures that the second cross arms 51 have sufficient displacement during extension and retraction to ensure the normal operation of the extension and retraction process.

[0104] It should be noted that the secondary drive mechanism 52 can adopt the following structure:

[0105] The secondary drive mechanism 52 includes a secondary drive motor 521, a secondary lead screw 522, a secondary connecting plate 523, an inclined block 524, and two sets of secondary sliding components 525;

[0106] The secondary drive motor 521 and the secondary lead screw 522 are both arranged on the secondary bearing frame 4 and connected by transmission. The transmission direction of the secondary lead screw 522 is the same as the arrangement direction of the secondary lower slide rail 56.

[0107] Two sets of secondary sliding components 525 are respectively arranged between the two sets of second cross arms 51. The secondary sliding component 525 includes a secondary guide rail and a secondary slider that slide and cooperate with each other. The arrangement direction of the secondary guide rail is the same as the arrangement direction of the secondary lower slide rail 56.

[0108] The body of the secondary connecting plate 523 is connected to the secondary lead screw 522. The end of the secondary connecting plate 523 away from the secondary lead screw 522 is connected to the inclined block 524, and the inclined block 524 is connected to two secondary sliders respectively.

[0109] The middle ends of the two sets of second cross arms 51 are connected to a connecting rod 57, and a rotating wheel 58 is provided on the connecting rod 57. The rotating wheel 58 is in contact with the inclined surface of the inclined block 524.

[0110] Specifically, the secondary drive motor 521 drives the secondary lead screw 522 to work, which in turn drives the secondary connecting plate 523 to move. Since the secondary connecting plate 523 is connected to the inclined block 524, it also drives the inclined block 524 to move. When the inclined block 524 moves, the contact point between it and the rotating wheel 58 will change, and the height will change, which in turn drives the second cross arm 51 to rise and fall.

[0111] Example 4

[0112] Referring to Figure 5, the transfer trolley with two-stage lifting function provided in this embodiment differs from that in Embodiment 1 in that:

[0113] The secondary lifting device 5 includes four sets of secondary lifting components 8 arranged sequentially around the inside of the secondary load-bearing frame 4;

[0114] The secondary lifting component 8 includes a secondary electric push rod 81, a lifting section guide rail 82, a lifting section slider 83, a lifting section hinge seat 84, a lifting section first hinge rod 85, and a lifting section second hinge rod 86.

[0115] The lifting section guide rail 82 and the lifting section slider 83 are slidably engaged and arranged in the secondary load-bearing frame 4, and the lifting section hinge seat 84 is connected to the lifting section slider 83.

[0116] One end of the first hinge rod 85 of the lifting section is hinged in the lifting section hinge seat 84, and the other end of the first hinge rod 85 of the lifting section is hinged to the bottom end of the secondary platform 6.

[0117] One end of the second hinge rod 86 of the lifting part is hinged to the rod body of the first hinge rod 85 of the lifting part, and the other end of the second hinge rod 86 of the lifting part is hinged in the secondary load-bearing frame 4. The second hinge rod 86 of the lifting part and the first hinge rod 85 of the lifting part are in the shape of "A".

[0118] The output end of the secondary electric push rod 81 is connected to the lifting section hinge seat 84.

[0119] In addition, sensing components 9 are arranged at the four corners of the secondary platform 6, and the four secondary electric push rods 81 are connected to the four sensing components 9 one by one through the control unit.

[0120] Specifically, the secondary platform 6 is raised by four independent secondary lifting components 8, which can pick up battery compartments or batteries in non-horizontal positions. After the battery compartment is detected by the sensing component 9 on the secondary platform 6, the pushing stops, and the new battery can be installed back according to the angle when the battery compartment is picked up, so as not to cause installation errors due to tilt.

[0121] This document uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. Furthermore, those skilled in the art will recognize that, based on the ideas of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A transfer trolley with two-stage lifting function, comprising the transfer trolley, characterized in that, The chassis of the transfer trolley is equipped with a primary lifting device; The top of the primary lifting device is provided with a primary platform, and the bottom of the primary platform is provided with a secondary load-bearing frame. A notch is provided on the primary platform at the position corresponding to the secondary load-bearing frame. The secondary load-bearing frame is equipped with a secondary lifting device, and the top of the secondary lifting device is equipped with a secondary platform, the shape of which is adapted to the shape of the notch.

2. The transfer trolley with two-stage lifting function according to claim 1, characterized in that, The primary lifting device includes two sets of correspondingly arranged first cross arms and a primary drive mechanism. The top end of the first cross arm is hinged to the bottom end of the primary platform; The first upper rolling component is connected to the other end of the top of the first cross arm; A first upper rolling seat is installed at the bottom of the first-level platform at a position corresponding to the first upper rolling component, and the first upper rolling component is arranged inside the first upper rolling seat. One end of the bottom of the first cross arm is hinged to the chassis of the transfer trolley; The other end of the bottom of the first cross arm is connected to a first lower rolling component; A first lower rolling seat is installed on the chassis of the transfer trolley at a position corresponding to the first lower rolling component, and the first lower rolling component is arranged inside the first lower rolling seat. The first upper rolling seat corresponds to the first lower rolling seat in position; The primary drive mechanism is mounted on the chassis of the transfer trolley and is connected to the wall of the two sets of the first cross arms near the first lower rolling seat. The driving direction of the first-stage drive mechanism is the same as the arrangement direction of the first lower rolling seat.

3. A transfer trolley with two-stage lifting function according to claim 2, characterized in that, The primary drive mechanism includes a primary drive motor, a primary lead screw, a primary connecting plate, and two sets of primary sliding components. The primary drive motor and the primary lead screw are both mounted on the chassis of the transfer trolley and connected in a transmission manner. The transmission direction of the primary lead screw is the same as the mounting direction of the first lower rolling seat. The two sets of primary sliding components are respectively arranged near the two first lower rolling seats. Each primary sliding component includes a primary guide rail and a primary slider that slide and cooperate with each other. The arrangement direction of the primary guide rail is the same as the arrangement direction of the first lower rolling seats. The body of the primary connecting plate is connected to the primary lead screw, and both ends of the body of the primary connecting plate are respectively connected to the two primary sliders; The primary connecting plate also connects to the wall of the two sets of the first cross arms near the first lower rolling seat.

4. A transfer trolley with two-stage lifting function according to claim 1, characterized in that, An auxiliary cross arm is provided between the chassis of the transfer trolley and the primary platform.

5. A transfer trolley with two-stage lifting function according to claim 1, characterized in that, The secondary lifting device includes two sets of correspondingly arranged second cross arms and a secondary drive mechanism; The top end of the second cross arm is hinged to the bottom end of the secondary platform; The other end of the top of the second cross arm is hinged to a secondary upper slider. A secondary upper slide rail is installed at the bottom of the secondary platform at a position corresponding to the secondary upper slider. The secondary upper slider and the secondary upper slide rail slide in a sliding engagement. The bottom end of the second cross arm is hinged to the secondary load-bearing frame; The other end of the bottom of the second cross arm is hinged to a secondary lower slider. A secondary lower slide rail is installed on the secondary bearing frame at a position corresponding to the secondary lower slider. The secondary lower slider and the secondary lower slide rail slide in a sliding engagement. The upper secondary slide rail and the lower secondary slide rail are positioned correspondingly; The secondary drive mechanism is disposed on the secondary load-bearing frame and is respectively connected to the two sets of the second cross arms; The driving direction of the secondary drive mechanism is the same as the layout direction of the secondary lower slide rail.

6. A transfer trolley with two-stage lifting function according to claim 5, characterized in that, The secondary drive mechanism includes a secondary drive motor, a secondary lead screw, a secondary connecting plate, an inclined block, and two sets of secondary sliding components; The secondary drive motor and the secondary lead screw are both arranged on the secondary bearing frame and connected by transmission. The transmission direction of the secondary lead screw is the same as the arrangement direction of the secondary lower slide rail. Two sets of secondary sliding components are respectively arranged between two sets of second cross arms. Each secondary sliding component includes a secondary guide rail and a secondary slider that slide together. The arrangement direction of the secondary guide rail is the same as the arrangement direction of the secondary lower slide rail. The body of the secondary connecting plate is connected to the secondary lead screw, and the end of the secondary connecting plate away from the secondary lead screw is connected to the inclined block. The inclined block is connected to two of the secondary sliders respectively. The middle ends of the two sets of second cross arms are connected by a connecting rod, and the connecting rod is provided with a rotating wheel, which contacts the inclined surface of the inclined block.

7. A transfer trolley with two-stage lifting function according to claim 1, characterized in that, The secondary lifting device includes four sets of secondary lifting components arranged sequentially around the inside of the secondary load-bearing frame. The secondary lifting component includes a secondary electric push rod, a lifting section guide rail, a lifting section slider, a lifting section hinge seat, a lifting section first hinge rod, and a lifting section second hinge rod. The lifting section guide rail and the lifting section slider are slidably engaged and arranged within the secondary load-bearing frame, and the lifting section hinge seat is connected to the lifting section slider; One end of the first hinge rod of the lifting part is hinged in the hinge seat of the lifting part, and the other end of the first hinge rod of the lifting part is hinged to the bottom end of the secondary platform. One end of the second hinge rod of the lifting part is hinged to the rod body of the first hinge rod of the lifting part, and the other end of the second hinge rod of the lifting part is hinged to the secondary load-bearing frame; The output end of the secondary electric push rod is connected to the lifting section hinge seat.

8. A transfer trolley with two-stage lifting function according to claim 7, characterized in that, The four corners of the secondary platform are equipped with sensing components, and the four secondary electric push rods are connected to the four sensing components one by one through the control unit.

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