A transport system for railway wagons

Abstract

The application discloses a conveying system of a railway wagon and relates to the technical field of conveying equipment. The conveying system comprises a conveying mechanism, the top of the conveying mechanism being used for placing goods to be conveyed; a lifting mechanism, the conveying mechanism being arranged on the top of the lifting mechanism; a control unit and a gravity detection circuit, the control unit being connected with the gravity detection circuit, the gravity detection circuit being arranged in the conveying mechanism and being used for detecting the horizontal coordinate position and gravity of the goods to be conveyed; and the control unit receiving a target position conveying instruction, controlling the lifting mechanism to be lifted to a set vertical coordinate according to the target position conveying instruction, and controlling the conveying mechanism to be conveyed to a set horizontal coordinate according to the target position conveying instruction, so as to complete the conveying of the goods. The conveying system solves the automation of material storage and completes the material conveying of the railway wagon in a limited space where a crown block and a forklift cannot reach.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission equipment, in particular to a transmission system of railway wagons. BACKGROUND

[0002] The small door of railway wagons hangs the door transmission mostly adopts the overhead crane hoisting or forklift transfer, the automatic degree is not high, uses the overhead crane in the material transfer process to exist the security risk, easily causes the material to drop, simultaneously the overhead crane and forklift exist the blind area in the transmission process, for the space limited transmission material has the limitation in the smaller site, therefore needs a kind of transmission system with transmission and lifting. SUMMARY

[0003] The purpose of the present application is to provide a transmission system of railway wagons, to solve the material storage automation, to complete the material transmission of railway wagons in the limited space where the overhead crane and forklift cannot reach.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] One aspect of the present application provides a transmission system of railway wagons, the transmission system comprising: a conveying mechanism, the top of the conveying mechanism is used for placing goods to be transmitted; a lifting mechanism, the conveying mechanism is arranged on the top of the lifting mechanism; a control unit and a gravity detection circuit, the control unit and the gravity detection circuit are connected, the gravity detection circuit is arranged in the conveying mechanism to detect the horizontal coordinate position and gravity of the goods to be transmitted; the control unit receives a target position conveying instruction, controls the lifting mechanism to lift to a set longitudinal coordinate according to the target position conveying instruction, and controls the conveying mechanism to convey to a set horizontal coordinate according to the target position conveying instruction, to complete the transmission of goods.

[0006] In some embodiments, the conveying mechanism comprises a support table and a transmission device, the support table is arranged on the top of the lifting mechanism, and the transmission device is arranged on the top of the support table.

[0007] In some embodiments, the gravity detection circuit comprises at least two gravity sensors, and at least two amplification circuits connected with the at least two gravity sensors, and the at least two amplification circuits are connected with the input end of the control unit.

[0008] In some embodiments, the lifting mechanism comprises at least two support frames, the middle part of the support frame is provided with at least two lifting cylinders, the top of the at least two lifting cylinders is used for connecting with the bottom of the conveying mechanism, and the at least two support frames are arranged at equal intervals on the bottom of the conveying mechanism.

[0009] In some embodiments, the transmission system further comprises a first motor drive circuit, a second motor drive circuit, a first pump motor and a second pump motor, the control end of the first motor drive circuit and the control end of the second motor drive circuit are connected to the output end of the control unit, the first pump motor is connected to the output end of the first motor drive circuit, the second pump motor is connected to the output end of the second motor drive circuit, and the first pump motor and the second pump motor are used to supply oil and unload oil to the lifting cylinder for controlling the lifting cylinder to lift and lower.

[0010] In some embodiments, the transmission system further comprises a forward-reverse circuit, the transmission device comprises at least two transmission motors, the control end of the forward-reverse circuit is connected to the output end of the control unit, and the output end of the forward-reverse circuit is connected to the at least two transmission motors for controlling the at least two transmission motors to work.

[0011] In some embodiments, the forward-reverse circuit comprises a first relay, a first NPN transistor, a first resistor, a second resistor and a switch, the base of the first NPN transistor is connected to the output end of the control unit through the first resistor, the emitter of the first NPN transistor is grounded, the collector of the first NPN transistor is connected to one end of the control end of the first relay, the other end of the control end of the first relay is connected to the power supply through the second resistor, the first pin and the fourth pin of the controlled end of the first relay are connected to positive electricity, the second pin and the third pin of the controlled end of the first relay are connected to negative electricity, the fifth pin and the sixth pin of the controlled end of the first relay are respectively connected to the two input ends of the switch, and the two output ends of the switch are used to connect the transmission motor; when controlling the forward rotation of the transmission motor, the fifth pin of the controlled end of the first relay is connected to the first pin of the controlled end, and the sixth pin of the controlled end of the first relay is connected to the second pin of the controlled end; when controlling the reverse rotation of the transmission motor, the fifth pin of the controlled end of the first relay is connected to the third pin of the controlled end, and the sixth pin of the controlled end of the first relay is connected to the fourth pin of the controlled end.

[0012] In some embodiments, the switch adopts a second relay, the positive and negative rotation circuit further comprises a second NPN triode, a third resistor and a fourth resistor, the base of the second NPN triode is connected to the output of the control unit through the fourth resistor, the emitter of the second NPN triode is grounded, the collector of the second NPN triode is connected to one end of the control end of the second relay, the other end of the control end of the second relay is connected to the power supply through the third resistor, one end of the first controlled end of the second relay is connected to the fifth pin of the controlled end of the first relay, one end of the second controlled end of the second relay is connected to the sixth pin of the controlled end of the first relay, and the other ends of the first and second controlled ends of the second relay are used to connect the transmission motor.

[0013] In some embodiments, the positive and negative rotation circuit further comprises a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the base of the first NPN triode, one end of the sixth resistor is connected to the base of the second NPN triode, and the other ends of the fifth resistor and the sixth resistor are both grounded.

[0014] In some embodiments, the positive and negative rotation circuit further comprises a first diode and a second diode, the positive pole of the first diode is connected to one end of the control end of the first relay, the negative pole of the first diode is connected to the other end of the control end of the first relay, the positive pole of the second diode is connected to one end of the control end of the second relay, and the negative pole of the second diode is connected to the other end of the control end of the second relay.

[0015] According to the railway wagon transmission system of the embodiment of the present application, the following beneficial effects are achieved: the method of the traditional railway wagon body door transmission system is changed, the material transmission is automated, and the problems of limited space and material storage and transmission are solved. The automated transmission and lifting platform effectively improve the intrinsic safety, effectively avoid safety hazards in production, and effectively liberate labor and reduce labor intensity.

[0016] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a structural schematic diagram of the transmission system according to the embodiment.

[0019] Figure 2 This is a schematic block diagram of the transmission system according to an embodiment;

[0020] Figure 3 This is a schematic diagram of the forward and reverse rotation circuit according to an embodiment.

[0021] The reference numerals in the attached drawings are explained as follows: 1. Support platform; 2. Transmission device; 3. Support frame; 4. Lifting cylinder. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "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 invention 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 invention.

[0024] The terms "first," "second," and "third" 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. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "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 based on the specific circumstances.

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0027] The technical solutions of the embodiments of this application are briefly described below:

[0028] According to some embodiments, such as Figures 1 to 2 As shown, this application provides a transmission system for railway freight cars, the transmission system comprising:

[0029] A conveying mechanism, the top of which is used to place the goods to be conveyed;

[0030] A lifting mechanism, wherein the conveying mechanism is disposed at the top of the lifting mechanism;

[0031] A control unit and a gravity detection circuit are connected. The gravity detection circuit is disposed in the conveying mechanism to detect the lateral coordinate position and gravity of the goods to be conveyed.

[0032] The control unit receives a target location transmission command, controls the lifting mechanism to rise and fall to a set vertical coordinate according to the target location transmission command, and controls the conveying mechanism to convey to a set horizontal coordinate according to the target location transmission command, so as to complete the transfer of goods.

[0033] The working principle of the above embodiment is as follows: after the goods to be transferred are placed on the conveying mechanism, the conveying mechanism is used to move the position of the goods left and right on the horizontal axis, and the lifting mechanism is used to lift the conveying mechanism up and down to further move the vertical axis position of the goods. The control unit can detect the horizontal axis position and gravity of the goods to be transferred through the gravity detection circuit.

[0034] After a target position transfer command is input to the control unit, the control unit controls the lifting mechanism to rise and fall to the set vertical coordinate, and controls the conveying mechanism to move to the set horizontal coordinate. Once the goods are conveyed to the designated position, the control unit detects the weight of the goods through a gravity detection circuit to determine their horizontal coordinate. After confirming the horizontal coordinate is correct, the control unit prompts the staff to complete the transfer, and the staff then pushes the goods into the shelf. The target position is the coordinate of the shelf where the goods are placed.

[0035] The following is in conjunction with the appendix to this instruction manual. Figures 1 to 3The preferred embodiments of this disclosure will be further described in detail.

[0036] According to some embodiments, such as Figure 1 As shown, the conveying mechanism includes a support platform 1 and a transmission device 2. The support platform 1 is disposed on the top of the lifting mechanism, and the transmission device 2 is disposed on the top of the support platform 1.

[0037] According to some embodiments, such as Figure 1 As shown, the lifting mechanism includes at least two support frames 3, and at least two lifting cylinders 4 are provided in the middle of the support frame 3. The top of the at least two lifting cylinders 4 is used to connect with the bottom of the conveying mechanism. The at least two support frames 3 are equally spaced at the bottom of the conveying mechanism.

[0038] Based on the above embodiments, in some embodiments of this application, three support frames 3 are provided, each equally spaced at the bottom of the conveying mechanism. Two lifting cylinders 4 are provided in the middle of each support frame 3. The lifting cylinders 4 are used to raise or lower the support platform 1, and the upper surface of the support platform 1 is used to fix the conveying device 2. The goods to be conveyed are placed on the conveying device 2. The lifting cylinders 4 are used to raise and lower the conveying device 2, thereby driving the goods to be conveyed to rise and fall. The conveying device 2 is used to move the position of the goods left and right on the horizontal axis. When the goods reach the designated coordinate position, they are pushed onto the shelf.

[0039] According to some embodiments, such as Figure 2 As shown, the gravity detection circuit includes at least two gravity sensors and at least two amplification circuits connected to the at least two gravity sensors, and the at least two amplification circuits are connected to the input terminal of the control unit.

[0040] At least two gravity sensors are equally spaced on the transmission device 2 to detect the real-time lateral coordinate position of the cargo based on its weight. After detecting the cargo's weight, the gravity sensors output a weak gravity detection electrical signal. This signal is amplified by an amplifier circuit to a current and voltage suitable for the control unit before being output to the control unit. The control unit calculates the cargo's weight and identifies its lateral coordinate position based on the gravity detection signal.

[0041] According to some embodiments, such as Figure 2As shown, the transmission system further includes a first motor drive circuit, a second motor drive circuit, a first pump motor, and a second pump motor. The control terminals (coil terminals) of the first motor drive circuit and the second motor drive circuit are both connected to the output terminals of the control unit. The first pump motor is connected to the output terminal of the first motor drive circuit, and the second pump motor is connected to the output terminal of the second motor drive circuit. The first pump motor and the second pump motor are used to supply oil to and unload oil from the lifting cylinder 4 to control the lifting of the lifting cylinder 4.

[0042] Based on the above embodiments, the first motor drive circuit is used to control the operation of the first pump motor, and the second motor drive circuit is used to control the operation of the second pump motor. The first pump motor and the second pump motor are used to coordinately control the lifting cylinder 4 to rise or fall.

[0043] According to some embodiments, such as Figure 2 As shown, the transmission system also includes a forward and reverse circuit, and the transmission device 2 includes at least two transmission motors. The control terminal (coil terminal) of the forward and reverse circuit is connected to the output terminal of the control unit, and the output terminal of the forward and reverse circuit is connected to the at least two transmission motors for controlling the operation of the at least two transmission motors.

[0044] Based on the above embodiments, the conveying device 2 is equipped with conveyor rollers corresponding to the number of at least two conveying motors. Each of the at least two conveying motors controls the rotation of one conveyor roller, causing the conveyor roller to rotate forward or backward. Goods are placed on the conveyor rollers, facilitating the transfer and movement of goods along the horizontal axis. This application uses a forward and reverse reversal circuit to control the conveyor rollers on the conveying device 2. When the goods have been transported beyond the target position, they can reverse to return to the target position. Compared to only unidirectional operation, the forward and reverse reversal circuit of this application increases the fault tolerance rate of goods transfer.

[0045] According to some embodiments, such as Figure 3As shown, the forward / reverse circuit includes a first relay K1, a first NPN transistor Q1, a first resistor R1, a second resistor R2, and a switch. The base of the first NPN transistor Q1 is connected to the output terminal of the control unit through the first resistor R1. The emitter of the first NPN transistor Q1 is grounded. The collector of the first NPN transistor Q1 is connected to one end of the control terminal (coil terminal) of the first relay K1. The other end of the control terminal (coil terminal) of the first relay K1 is connected to the power supply through the second resistor R2. The first and fourth pins of the controlled terminal (contactor) of the first relay K1 are connected to positive power, and the second and third pins of the controlled terminal (contactor) of the first relay K1 are connected to negative power. The fifth and sixth pins of the controlled terminal (contactor) of the first relay K1 are respectively connected to the two input terminals of the switch. The two output terminals of the switch are used to connect to the transmission motor.

[0046] When the control transmission motor rotates forward, the fifth pin of the controlled terminal (contactor) of the first relay K1 is connected to the first pin of the controlled terminal (contactor), and the sixth pin of the controlled terminal (contactor) of the first relay K1 is connected to the second pin of the controlled terminal (contactor).

[0047] When the control transmission motor reverses, the fifth pin of the controlled terminal (contactor) of the first relay K1 is connected to the third pin of the controlled terminal (contactor), and the sixth pin of the controlled terminal (contactor) of the first relay K1 is connected to the fourth pin of the controlled terminal (contactor).

[0048] The working principle based on the above embodiment is as follows: when the transmission motor is controlled to rotate forward, that is, when the conveyor roller is controlled to drive the goods to move in the forward direction, the control unit outputs a high level to the base of the first NPN transistor Q1 through the first resistor R1. The first NPN transistor Q1 is turned on, and the control terminal (coil terminal) of the first relay K1 is energized and closed. The fifth pin of the controlled terminal (contactor) of the first relay K1 is connected to the first pin of the controlled terminal (contactor), and the sixth pin of the controlled terminal (contactor) of the first relay K1 is connected to the second pin of the controlled terminal (contactor). At this time, the transmission motor rotates forward after the switch is closed.

[0049] When the control transmission motor reverses, that is, when the control transmission roller drives the goods to move in the opposite direction, the control unit outputs a low level to the base of the first NPN transistor Q1 through the first resistor R1. The first NPN transistor Q1 is cut off, the control terminal (coil terminal) of the first relay K1 is de-energized, the fifth pin of the controlled terminal (contactor) of the first relay K1 is connected to the third pin of the controlled terminal (contactor), and the sixth pin of the controlled terminal (contactor) of the first relay K1 is connected to the fourth pin of the controlled terminal (contactor). At this time, the transmission motor reverses after the switch is closed.

[0050] According to some embodiments, such as Figure 3 As shown, the switch uses a second relay K2. The forward / reverse circuit also includes a second NPN transistor Q2, a third resistor R3, and a fourth resistor R4. The base of the second NPN transistor Q2 is connected to the output terminal of the control unit through the fourth resistor R4. The emitter of the second NPN transistor Q2 is grounded. The collector of the second NPN transistor Q2 is connected to one end of the control terminal (coil terminal) of the second relay K2. The other end of the control terminal (coil terminal) of the second relay K2 is connected to the power supply through the third resistor R3. One end of the first controlled terminal (contactor) of the second relay K2 is connected to the fifth pin of the controlled terminal (contactor) of the first relay K1. One end of the second controlled terminal (contactor) of the second relay K2 is connected to the sixth pin of the controlled terminal (contactor) of the first relay K1. The other ends of the first and second controlled terminals (contactors) of the second relay K2 are used to connect to the transmission motor.

[0051] The working principle based on the above embodiment is as follows: When the transmission motor is controlled to rotate forward, that is, when the conveyor roller is controlled to move the goods in the forward direction, the fifth pin of the controlled terminal (contactor) of the first relay K1 is connected to the first pin of the controlled terminal (contactor), and the sixth pin of the controlled terminal (contactor) of the first relay K1 is connected to the second pin of the controlled terminal (contactor). The control unit outputs a high level to the base of the second NPN transistor Q2 through the fourth resistor R4. The second NPN transistor Q2 is turned on, the control terminal (coil terminal) of the second relay K2 is energized, the controlled terminal (contactor) is energized, and the transmission motor rotates forward.

[0052] When the control conveyor motor reverses, that is, when the control conveyor roller moves the goods in the opposite direction, the fifth pin of the controlled terminal (contactor) of the first relay K1 is connected to the third pin of the controlled terminal (contactor), and the sixth pin of the controlled terminal (contactor) of the first relay K1 is connected to the fourth pin of the controlled terminal (contactor). The control unit outputs a high level to the base of the second NPN transistor Q2 through the fourth resistor R4. The second NPN transistor Q2 conducts, the control terminal (coil terminal) of the second relay K2 is energized, the controlled terminal (contactor) is energized, and the conveyor motor reverses.

[0053] When it is necessary to shut off the transmission motor, the control unit outputs a low level to the base of the second NPN transistor Q2 through the fourth resistor R4. The second NPN transistor Q2 is turned off, the control terminal (coil terminal) of the second relay K2 is de-energized, the controlled terminal (contactor) is disconnected, and the transmission motor stops rotating.

[0054] Among them, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are used for current limiting protection; the first NPN transistor Q1 and the first relay K1, as well as the second NPN transistor Q2 and the second relay K2, realize the large current of the transmission motor connected by the small current control contactor on the control unit side.

[0055] According to some embodiments, such as Figure 3 As shown, the forward and reverse circuit also includes a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 is connected to the base of the first NPN transistor Q1, and one end of the sixth resistor R6 is connected to the base of the second NPN transistor Q2. The other ends of the fifth resistor R5 and the sixth resistor R6 are both grounded.

[0056] The working principle based on the above embodiment is as follows: when the control transmission motor reverses, that is, when the control transmission roller drives the goods to move in the opposite direction, the control unit stops outputting a high level to the base of the first NPN transistor Q1. The base of the first NPN transistor Q1 is grounded through the fifth resistor R5. The first NPN transistor Q1 is cut off, the control terminal (coil terminal) of the first relay K1 is de-energized, the fifth pin of the controlled terminal (contactor) of the first relay K1 is connected to the third pin of the controlled terminal (contactor), and the sixth pin of the controlled terminal (contactor) of the first relay K1 is connected to the fourth pin of the controlled terminal (contactor).

[0057] When it is necessary to shut off the transmission motor, the control unit stops outputting a high level to the base of the second NPN transistor Q2. The base of the second NPN transistor Q2 is grounded through the sixth resistor R6, the second NPN transistor Q2 is cut off, the control terminal (coil terminal) of the second relay K2 is de-energized, the controlled terminal (contactor) is disconnected, and the transmission motor stops rotating.

[0058] According to some embodiments, such as Figure 3 As shown, the forward and reverse circuit also includes a first diode D1 and a second diode D2. The anode of the first diode D1 is connected to one end of the control terminal (coil terminal) of the first relay K1, and the cathode of the first diode D1 is connected to the other end of the control terminal (coil terminal) of the first relay K1. The anode of the second diode D2 is connected to one end of the control terminal (coil terminal) of the second relay K2, and the cathode of the second diode D2 is connected to the other end of the control terminal (coil terminal) of the second relay K2.

[0059] Based on the above embodiments, when the first NPN transistor Q1 goes from being turned on to being turned off, the control terminal (coil terminal) of the first relay K1 is connected to the freewheeling current through the first diode D1, which increases the service life of the first relay K1; when the second NPN transistor Q2 goes from being turned on to being turned off, the control terminal (coil terminal) of the second relay K2 is connected to the freewheeling current through the second diode D2, which increases the service life of the second relay K2.

[0060] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although this disclosure has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Because this disclosure can be embodied in many forms without departing from the spirit or substance of this application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A transmission system for railway freight cars, characterized in that, The transmission system includes: A conveying mechanism, the top of which is used to place goods to be conveyed; the conveying mechanism includes a conveying device; A lifting mechanism, wherein the conveying mechanism is disposed at the top of the lifting mechanism; A control unit and a gravity detection circuit are connected. The gravity detection circuit is disposed in the conveying mechanism to detect the lateral coordinate position and gravity of the goods to be conveyed. The control unit receives a target location transmission command, controls the lifting mechanism to rise and fall to a set vertical coordinate according to the target location transmission command, and controls the conveying mechanism to convey to a set horizontal coordinate according to the target location transmission command, so as to complete the transfer of goods; The transmission system further includes a forward and reverse circuit, and the transmission device includes at least two transmission motors. The control terminal of the forward and reverse circuit is connected to the output terminal of the control unit, and the output terminal of the forward and reverse circuit is connected to the at least two transmission motors for controlling the operation of the at least two transmission motors. The forward / reverse circuit includes a first relay, a first NPN transistor, a first resistor, a second resistor, and a switch. The base of the first NPN transistor is connected to the output terminal of the control unit through the first resistor. The emitter of the first NPN transistor is grounded. The collector of the first NPN transistor is connected to one end of the control terminal of the first relay. The other end of the control terminal of the first relay is connected to a power supply through the second resistor. The first and fourth controlled pins of the first relay are connected to positive power, and the second and third controlled pins of the first relay are connected to negative power. The fifth and sixth controlled pins of the first relay are respectively connected to the two input terminals of the switch. The two output terminals of the switch are used to connect to the transmission motor. When the control transmission motor rotates forward, the fifth pin of the controlled terminal of the first relay is connected to the first pin of the controlled terminal, and the sixth pin of the controlled terminal of the first relay is connected to the second pin of the controlled terminal. When the control transmission motor reverses, the fifth pin of the controlled end of the first relay is connected to the third pin of the controlled end, and the sixth pin of the controlled end of the first relay is connected to the fourth pin of the controlled end. The switch uses a second relay. The forward / reverse circuit also includes a second NPN transistor, a third resistor, and a fourth resistor. The base of the second NPN transistor is connected to the output terminal of the control unit through the fourth resistor. The emitter of the second NPN transistor is grounded. The collector of the second NPN transistor is connected to one end of the control terminal of the second relay. The other end of the control terminal of the second relay is connected to the power supply through the third resistor. One end of the first controlled terminal of the second relay is connected to the fifth pin of the controlled terminal of the first relay. One end of the second controlled terminal of the second relay is connected to the sixth pin of the controlled terminal of the first relay. The other ends of the first and second controlled terminals of the second relay are used to connect to the transmission motor.

2. The transmission system according to claim 1, characterized in that, The conveying mechanism further includes a support platform, which is disposed on top of the lifting mechanism, and the conveying device is disposed on top of the support platform.

3. The transmission system according to claim 1, characterized in that, The gravity detection circuit includes at least two gravity sensors and at least two amplification circuits connected to the at least two gravity sensors, and the at least two amplification circuits are connected to the input terminal of the control unit.

4. The transmission system according to claim 1, characterized in that, The lifting mechanism includes at least two support frames, and at least two lifting cylinders are provided in the middle of the support frames. The tops of the at least two lifting cylinders are used to connect with the bottom of the conveying mechanism. The at least two support frames are equally spaced at the bottom of the conveying mechanism.

5. The transmission system according to claim 4, characterized in that, The transmission system further includes a first motor drive circuit, a second motor drive circuit, a first pump motor, and a second pump motor. The control terminals of the first motor drive circuit and the second motor drive circuit are both connected to the output terminal of the control unit. The first pump motor is connected to the output terminal of the first motor drive circuit, and the second pump motor is connected to the output terminal of the second motor drive circuit. The first pump motor and the second pump motor are used to supply oil to and unload oil from the lifting cylinder to control the lifting of the lifting cylinder.

6. The transmission system according to claim 1, characterized in that, The forward and reverse circuit also includes a fifth resistor and a sixth resistor. One end of the fifth resistor is connected to the base of the first NPN transistor, and one end of the sixth resistor is connected to the base of the second NPN transistor. The other ends of the fifth resistor and the sixth resistor are both grounded.

7. The transmission system according to claim 1, characterized in that, The forward and reverse circuit also includes a first diode and a second diode. The anode of the first diode is connected to one end of the control terminal of the first relay, and the cathode of the first diode is connected to the other end of the control terminal of the first relay. The anode of the second diode is connected to one end of the control terminal of the second relay, and the cathode of the second diode is connected to the other end of the control terminal of the second relay.

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