Transfer trolley with two-stage lifting function

Abstract

The utility model discloses a transfer trolley with a two-stage lifting function. The transfer trolley comprises a transfer trolley body, and a first-stage lifting device is arranged on a chassis of the transfer trolley body. A first-stage platform is arranged at the top end of the first-stage lifting device, a second-stage bearing frame is installed at the bottom end of the first-stage platform, and a notch is formed in the position, corresponding to the second-stage bearing frame, of the first-stage platform; a second-stage lifting device is arranged on the second-stage bearing frame, a second-stage platform is arranged at the top end of the second-stage lifting device, and the shape of the second-stage platform is matched with that of the notch; the two-stage lifting structure can adapt to the ground clearance of vehicles in a larger range, various battery replacing trolleys do not need to be designed for different vehicle types, and the production cost and the operation complexity are reduced; and the first-stage platform and the second-stage platform can be lifted at the same time, so that the lifting time is shortened, and the overall battery replacement efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric automobile battery swap technical field especially relates to a transfer trolley with two stage lifting function. BACKGROUND

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

[0003] At present, the existing battery swap trolley generally adopts a layer of lifting structure to take and place the battery. Although this structure can complete the basic battery swap function, it has the following shortcomings:

[0004] Poor compatibility: for vehicles with high ground clearance, a layer of lifting structure needs a long cross arm to reach the battery, which limits the adaptability of the battery swap trolley to different vehicle models.

[0005] Low efficiency: the lifting speed of a layer of lifting structure is slow, which leads to a long battery swap time and reduces the operation efficiency of the battery swap station.

[0006] Large space occupation: in order to adapt to vehicles of different heights, a layer of lifting structure needs a long cross arm, which increases the length and floor area of the battery swap trolley, limiting the space utilization rate of the battery swap station. SUMMARY

[0007] The utility model aims at providing a transfer trolley with two stage lifting function to solve the problems in the above background technology.

[0008] To achieve the above purpose, the utility model provides the following scheme:

[0009] A transfer trolley with two stage lifting function, including transfer trolley, the chassis of transfer trolley is provided with a first lifting device;

[0010] The top end of the first lifting device is provided with a first platform, and the bottom end of the first platform is installed with a second bearing frame, and the first platform is provided with a notch at the position corresponding to the second bearing frame;

[0011] The second bearing frame is provided with a second lifting device, and the top end of the second lifting device is provided with a second platform, and the shape of the second platform is matched with the shape of the notch.

[0012] Further, the first lifting device includes two groups of first cross arms arranged correspondingly and a first driving mechanism;

[0013] One end of the top of the first cross arm is hinged to the bottom end of the first stage platform;

[0014] The other end of the top of the first cross arm is connected with a first upper rolling component;

[0015] The bottom end of the first stage platform is provided with a first upper rolling seat at a position corresponding to the first upper rolling component, and the first upper rolling component is arranged in the first upper rolling seat;

[0016] One end of the bottom of the first cross arm is hinged to the chassis of the transfer trolley;

[0017] The other end of the bottom of the first cross arm is connected with a first lower rolling component;

[0018] The chassis of the transfer trolley is provided with a first lower rolling seat at a position corresponding to the first lower rolling component, and the first lower rolling component is arranged in the first lower rolling seat;

[0019] The first upper rolling seat corresponds in position to the first lower rolling seat;

[0020] The first stage driving mechanism is arranged on the chassis of the transfer trolley and connected to the walls of the two groups of first cross arms near the first lower rolling seats respectively;

[0021] The driving direction of the first stage driving mechanism is the same as the arrangement direction of the first lower rolling seat.

[0022] Further, the first stage driving mechanism comprises a first stage driving motor, a first stage lead screw, a first stage connecting plate and two groups of first stage sliding assemblies;

[0023] The first stage driving motor and the first stage lead screw are both arranged on the chassis of the transfer trolley and transmission connected, and the transmission direction of the first stage lead screw is the same as the arrangement direction of the first lower rolling seat;

[0024] The two groups of first stage sliding assemblies are arranged near the two first lower rolling seats respectively, and each first stage sliding assembly comprises a first stage guide rail and a first stage sliding block which slide with each other, and the arrangement direction of the first stage guide rail is the same as the arrangement direction of the first lower rolling seat;

[0025] The plate body of the first stage connecting plate is connected with the first stage lead screw, and the two ends of the plate body of the first stage connecting plate are connected with the two first stage sliding blocks respectively;

[0026] The first stage connecting plate is also connected with the walls of the two groups of first cross arms near the first lower rolling seats respectively.

[0027] Further, the chassis of the transfer trolley and the first stage platform are provided with an auxiliary cross arm.

[0028] Further, the secondary lifting device comprises two groups of second cross arms arranged correspondingly and a secondary driving mechanism;

[0029] One end of the top of the second cross arm is hinged to the bottom end of the secondary platform;

[0030] The other end of the top of the second cross arm is hinged to a secondary upper sliding block, the bottom end of the secondary platform is provided with a secondary upper sliding rail at a position corresponding to the secondary upper sliding block, and the secondary upper sliding block and the secondary upper sliding rail are in sliding fit;

[0031] One end of the bottom of the second cross arm is hinged to the secondary bearing frame;

[0032] The other end of the bottom of the second cross arm is hinged to a secondary lower sliding block, the secondary bearing frame is provided with a secondary lower sliding rail at a position corresponding to the secondary lower sliding block, and the secondary lower sliding block and the secondary lower sliding rail are in sliding fit;

[0033] The secondary upper sliding rail and the secondary lower sliding rail are in position correspondence;

[0034] The secondary driving mechanism is arranged on the secondary bearing frame and connected to the two groups of second cross arms respectively;

[0035] The driving direction of the secondary driving mechanism is the same as the arrangement direction of the secondary lower sliding rail.

[0036] Further, the secondary driving mechanism comprises a secondary driving motor, a secondary lead screw, a secondary connecting plate, an inclined block and two groups of secondary sliding assemblies;

[0037] The secondary driving motor and the secondary lead screw are arranged on the secondary bearing frame and in transmission connection, and the transmission direction of the secondary lead screw is the same as the arrangement direction of the secondary lower sliding rail;

[0038] The two groups of secondary sliding assemblies are arranged correspondingly between the two groups of second cross arms, the secondary sliding assembly comprises a secondary guide rail and a secondary sliding block in sliding fit with each other, and the arrangement direction of the secondary guide rail is the same as the arrangement direction of the secondary lower sliding rail;

[0039] The plate body of the secondary connecting plate is connected with the secondary lead screw, one end of the secondary connecting plate away from the secondary lead screw is connected with the inclined block, and the inclined block is connected with the two secondary sliding blocks respectively;

[0040] The middle ends of the two groups of second cross arms are connected with a connecting rod, the connecting rod is provided with a rotating wheel, and the rotating wheel is in contact with the inclined surface of the inclined block.

[0041] Further, the secondary lifting device comprises four groups of secondary lifting components arranged at positions around the inside of the secondary bearing frame in sequence;

[0042] The secondary lifting components comprise a secondary electric push rod, a lifting part guide rail, a lifting part sliding block, a lifting part hinged seat, a lifting part first hinged rod and a lifting part second hinged rod;

[0043] The lifting part guide rail and the lifting part sliding block are slidingly matched and arranged in the secondary bearing frame, and the lifting part hinged seat is connected to the lifting part sliding block;

[0044] One end of the lifting part first hinged rod is hinged in the lifting part hinged seat, and the other end of the lifting part first hinged rod is hinged to the bottom end of the secondary platform;

[0045] One end of the lifting part second hinged rod is hinged on the rod of the lifting part first hinged rod, and the other end of the lifting part second hinged rod is hinged in the secondary bearing frame;

[0046] The output end of the secondary electric push rod is connected to the lifting part hinged seat.

[0047] Further, the four corners of the secondary platform are respectively arranged with sensing components, and four secondary electric push rods are connected to four sensing components in one-to-one correspondence through a control unit.

[0048] According to the above technical solution, compared with the prior art, the beneficial effects of the utility model are as follows:

[0049] Stronger compatibility: The two-stage lifting structure can adapt to a larger range of vehicle ground clearance, without the need to design multiple battery replacement trolleys for different vehicle models, reducing production costs and operation complexity.

[0050] Higher efficiency: The primary platform and the secondary platform can be lifted at the same time, shortening the lifting time and improving the overall battery replacement efficiency.

[0051] Smaller size: No longer need to use a longer cross arm to adapt to high ground clearance vehicles, making the battery replacement trolley smaller in size and more flexible, facilitating operation in limited space.

[0052] Enhanced adaptability: The battery compartment or battery in a non-horizontal position can be accessed, and the secondary platform stops pushing after sensing the battery compartment through the sensing components, and the new battery can be installed back according to the angle when accessing the battery compartment, without installation failure caused by inclination. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative labor.

[0054] Figure 1 Figure 1 is a schematic diagram of the overall structure of a transfer trolley with two-stage lifting function in an embodiment of the present application.

[0055] Figure 2 Figure 3 Figure 2 is a schematic diagram of the structure of a first-stage lifting device in an embodiment of the present application.

[0056] Figure 4 Figure 3 is a schematic diagram of one structure of a second-stage lifting device in an embodiment of the present application.

[0057] Figure 5 Figure 4 is a schematic diagram of another structure of a second-stage lifting device in an embodiment of the present application.

[0058] Legend of reference signs:

[0059] 1, transfer trolley; 2, first-stage lifting device; 21, first cross arm; 22, first-stage driving mechanism; 221, first-stage driving motor; 222, first-stage lead screw; 223, first-stage connecting plate; 224, first-stage sliding assembly; 23, first upper rolling part; 24, first upper rolling seat; 25, first lower rolling part; 26, first lower rolling seat; 3, first-stage platform; 31, notch; 4, second-stage bearing frame; 5, second-stage lifting device; 51, second cross arm; 52, second-stage driving mechanism; 521, second-stage driving motor; 522, second-stage lead screw; 523, second-stage connecting plate; 524, inclined block; 525, second-stage sliding assembly; 53, second-stage upper sliding block; 54, second-stage upper sliding rail; 55, second-stage lower sliding block; 56, second-stage lower sliding rail; 57, connecting rod; 58, rotating wheel; 6, second-stage platform; 7, auxiliary cross arm; 8, second-stage lifting part; 81, second-stage electric push rod; 82, lifting part guide rail; 83, lifting part sliding block; 84, lifting part hinged seat; 85, lifting part first hinged rod; 86, lifting part second hinged rod; 9, sensing part. DETAILED DESCRIPTION

[0060] The specific embodiments of the present application will be described in further detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0061] ​In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0062] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0063] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] In order to better understand the purpose, structure and function of the present application, the present application will be further described in detail below in combination with the drawings.

[0065] Embodiment one

[0066] Referring to Figure 1 As shown in the drawings, a transfer trolley with two-stage lifting function, comprising a transfer trolley 1, a first lifting device 2 is arranged on the chassis of the transfer trolley 1;

[0067] The top end of the first lifting device 2 is provided with a first platform 3, and the bottom end of the first platform 3 is provided with a second bearing frame 4, and the first platform 3 is provided with a notch 31 corresponding to the position of the second bearing frame 4;

[0068] The second bearing frame 4 is provided with a second lifting device 5, and the top end of the second lifting device 5 is provided with a second platform 6, and the shape of the second platform 6 is matched with the shape of the notch 31.

[0069] Specifically, the first-stage platform 3 is driven to ascend and descend by the first-stage lifting device 2, and on this basis, the second-stage platform 6 is driven to ascend and descend by the second-stage lifting device, so that a larger range of vehicle ground clearance can be adapted, and the first-stage platform 3 and the second-stage platform 6 can be simultaneously lifted, thereby shortening the lifting time and improving the overall battery replacement efficiency.

[0070] Specifically, the upper plane of the second-stage platform 6 can coincide with the upper plane of the first-stage platform 3 through the gap 31, so that the upper plane of the first-stage platform 3 serves as a complete plane.

[0071] It should be noted that the utility model not only can be applied to the battery, but also can be applied to the battery compartment (the battery is located in the battery compartment).

[0072] Embodiment two

[0073] Referring to Figure 1 、 2 , 3, the transfer trolley with two-stage lifting function provided by the embodiment is different from that of the embodiment one in that:

[0074] The first-stage lifting device 2 comprises two groups of first cross arms 21 and a first-stage driving mechanism 22.

[0075] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[0076] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[0077] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[0078] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[0079] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[0080] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[0081] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[0082] The first cross arm 21 is hingedly connected to the bottom end of the first-stage platform 3 at one end of the top portion thereof;

[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] See Figure 1 , 4 As shown, 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 comprises two sets of corresponding second cross arms 51 and a secondary driving mechanism 52;

[0096] One end of the top of the second cross arm 51 is hingedly connected to the bottom end of the secondary platform 6;

[0097] The other end of the top of the second cross arm 51 is hingedly connected to a secondary upper sliding block 53, the bottom end of the primary platform 3 is installed with a secondary upper sliding rail 54 at a corresponding position of the secondary upper sliding block 53, and the secondary upper sliding block 53 and the secondary upper sliding rail 54 are in sliding fit;

[0098] One end of the bottom of the second cross arm 51 is hingedly connected to the secondary bearing frame 4;

[0099] The other end of the bottom of the second cross arm 51 is hingedly connected to a secondary lower sliding block 55, the secondary bearing frame 4 is installed with a secondary lower sliding rail 56 at a corresponding position of the secondary lower sliding block 55, and the secondary lower sliding block 55 and the secondary lower sliding rail 56 are in sliding fit;

[0100] The secondary upper sliding rail 54 corresponds in position to the secondary lower sliding rail 56;

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

[0102] The driving direction of the secondary driving mechanism 52 is the same as the arrangement direction of the secondary lower sliding rail 56.

[0103] Specifically, the two sets of second cross arms 51 are driven to extend and retract by the secondary driving mechanism 52, thereby driving the secondary platform to lift, and the cooperation of the secondary lower sliding block 55 and the secondary lower sliding rail 56 ensures sufficient displacement of the second cross arm 51 during extension and retraction to ensure normal extension and retraction.

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

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

[0106] The secondary driving motor 521 and the secondary lead screw 522 are arranged on the secondary bearing frame 4 and in transmission connection, and the transmission direction of the secondary lead screw 522 is the same as the arrangement direction of the secondary lower sliding rail 56;

[0107] The two sets of secondary sliding assemblies 525 are arranged between the two sets of second cross arms 51 respectively, the secondary sliding assembly 525 comprises a secondary guide rail and a secondary sliding block in sliding fit with each other, and the arrangement direction of the secondary guide rail is the same as the arrangement direction of the secondary lower sliding 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] See Figure 5 As shown, 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 lifted by four sets of independent secondary lifting components 8, the battery compartment or battery in a non-horizontal position can be accessed, the pushing is stopped after the battery compartment is sensed by the sensing component 9 on the secondary platform 6, and the new battery can be installed back according to the angle when the battery compartment is accessed, and installation failure caused by tilting is avoided.

[0121] The principle and implementation mode of the present application are described by using specific examples herein, and the above example is only used for helping to understand the method and core idea of the present application; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A transfer trolley with two-stage lifting function, comprising a transfer trolley, characterized in that, The chassis of the transfer trolley is provided with a first lifting device; The top end of the first lifting device is provided with a first platform, the bottom end of the first platform is provided with a second bearing frame, and a notch is formed in the first platform at a position corresponding to the second bearing frame; The second bearing frame is provided with a second lifting device, the top end of the second lifting device is provided with a second platform, and the shape of the second platform is matched with the shape of the notch.

2. The transfer trolley with two-stage lifting function according to claim 1, characterized in that, The first lifting device comprises two groups of first cross arms arranged correspondingly and a first driving mechanism; One end of the top of the first cross arm is hinged to the bottom end of the first platform; The other end of the top of the first cross arm is connected with a first upper rolling part; The bottom end of the first platform is provided with a first upper rolling seat at a position corresponding to the first upper rolling part, and the first upper rolling part is arranged in 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 with a first lower rolling part; The chassis of the transfer trolley is provided with a first lower rolling seat at a position corresponding to the first lower rolling part, and the first lower rolling part is arranged in the first lower rolling seat; The first upper rolling seat and the first lower rolling seat are positionally corresponding; The first driving mechanism is arranged on the chassis of the transfer trolley and connected with the walls of the two groups of first cross arms near the first lower rolling seat respectively; The driving direction of the first driving mechanism is the same as the arrangement direction of the first lower rolling seat.

3. The transfer trolley with two-stage lifting function according to claim 2, characterized in that, The first driving mechanism comprises a first driving motor, a first lead screw, a first connecting plate and two groups of first sliding assemblies; The first driving motor and the first lead screw are arranged on the chassis of the transfer trolley and transmissionally connected, and the transmission direction of the first lead screw is the same as the arrangement direction of the first lower rolling seat; The two groups of first sliding assemblies are arranged near the two first lower rolling seats respectively, and each first sliding assembly comprises a first guide rail and a first sliding block which slide with each other, and the arrangement direction of the first guide rail is the same as the arrangement direction of the first lower rolling seat; The plate body of the first connecting plate is connected with the first lead screw, and the two ends of the plate body of the first connecting plate are connected with the two first sliding blocks respectively; The first connecting plate is also connected with the walls of the two groups of first cross arms near the first lower rolling seat respectively.

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

5. The transfer trolley with two-stage lifting function according to claim 1, characterized in that, The second lifting device comprises two groups of second cross arms arranged correspondingly and a second driving mechanism; One end of the top of the second cross arm is hinged to the bottom end of the second platform; The other end of the top of the second cross arm is hinged with a second upper sliding block, the bottom end of the second platform is provided with a second upper sliding rail at a position corresponding to the second upper sliding block, and the second upper sliding block and the second upper sliding rail slide with each other; One end of the bottom of the second cross arm is hinged to the second bearing frame; The second cross arm bottom other end is hinged with a secondary lower slider, the secondary bearing frame is provided with a secondary lower slide rail at a position corresponding to the secondary lower slider in sliding fit; The secondary upper slide rail corresponds in position to the secondary lower slide rail; The secondary drive mechanism is arranged on the secondary bearing frame and connected to the two groups of second cross arms respectively; The driving direction of the secondary drive mechanism is the same as the layout direction of the secondary lower slide rail.

6. The transfer trolley with two-stage lifting function according to claim 5, characterized in that, The secondary drive mechanism comprises a secondary drive motor, a secondary lead screw, a secondary connecting plate, an inclined block and two groups of secondary sliding assemblies; The secondary drive motor and the secondary lead screw are arranged on the secondary bearing frame in transmission connection, and the transmission direction of the secondary lead screw is the same as the layout direction of the secondary lower slide rail; The two groups of secondary sliding assemblies are arranged between the two groups of second cross arms in correspondence respectively, and each secondary sliding assembly comprises a secondary guide rail and a secondary slider in sliding fit, and the layout direction of the secondary guide rail is the same as the layout direction of the secondary lower slide rail; The plate body of the secondary connecting plate is connected to the secondary lead screw, one end of the secondary connecting plate away from the secondary lead screw is connected to the inclined block, and the inclined block is connected to the two secondary sliders respectively; The middle ends of the two groups of second cross arms are connected to a connecting rod, the connecting rod is provided with a rotating wheel, and the rotating wheel is in contact with the inclined surface of the inclined block.

7. The transfer trolley with two-stage lifting function according to claim 1, characterized in that, The secondary lifting device comprises four groups of secondary lifting components arranged in sequence at positions around the inside of the secondary bearing frame; The secondary lifting component comprises a secondary electric push rod, a lifting part guide rail, a lifting part slider, a lifting part hinged seat, a lifting part first hinged rod and a lifting part second hinged rod; The lifting part guide rail and the lifting part slider are in sliding fit and arranged in the secondary bearing frame, and the lifting part hinged seat is connected to the lifting part slider; One end of the lifting part first hinged rod is hinged in the lifting part hinged seat, and the other end of the lifting part first hinged rod is hinged to the bottom end of the secondary platform; One end of the lifting part second hinged rod is hinged on the rod body of the lifting part first hinged rod, and the other end of the lifting part second hinged rod is hinged in the secondary bearing frame; The output end of the secondary electric push rod is connected to the lifting part hinged seat.

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

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