A dual-motor control circuit and control system for aerial work vehicles

Abstract

The present invention relates to a dual-motor control circuit and control system for an aerial work vehicle, and belongs to the field of DC motor power for aerial work vehicles. The present invention includes a No. 1 relay, a No. 2 relay, a No. 3 relay, a No. 4 relay, a time delay relay, a left motor pump group, a right motor pump group, an operating power supply, a positive pole of a chassis battery, and an aerial work vehicle power supply; the operating power supply is connected to the No. 1 relay, the No. 1 relay is connected to the left motor pump group, the positive pole of the chassis battery is connected to the left motor pump group, the aerial work vehicle power supply is connected to the No. 2 relay, the No. 2 relay is connected to the left motor pump group, the operating power supply is connected to the No. 3 relay, the No. 3 relay is connected to the right motor pump group, the positive pole of the chassis battery is connected to the right motor pump group, the aerial work vehicle power supply is connected to the time delay relay, the time delay relay is connected to the No. 4 relay, and the No. 4 relay is connected to the right motor pump group.

Description

Technical Field

[0001] The invention relates to a dual-motor control circuit and a control system for an aerial work vehicle, and belongs to the field of direct current motor power for aerial work vehicles. Background Art

[0002] At present, vehicle-mounted aerial work vehicles mainly use a power take-off device installed on the chassis of the car to drive the hydraulic pump to provide hydraulic power. However, there is not enough space to install a power take-off device on some small pickup trucks and other vehicles. In this case, a DC motor pump group is needed to provide power. The voltage of a small pickup truck is generally 12V. This low-voltage DC motor pump group generally works in a short-term system. Working for a long time will burn the motor.

[0003] In view of this, a control system for an aerial work vehicle is disclosed in the patent document with application number 201510989972.2. The above-mentioned comparative document cannot realize the switching of two sets of motor pump groups, which is easy to damage the motor. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a dual-motor control circuit and control system for an aerial work vehicle with a reasonable structural design to solve the problem that a low-voltage DC motor pump group cannot work for a long time, and which is suitable for the working conditions of the aerial work vehicle for a long time.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: the aerial work vehicle dual-motor control circuit has the following structural characteristics: it includes No. 1 relay, No. 2 relay, No. 3 relay, No. 4 relay, time delay relay, left motor pump group, right motor pump group, operating power supply, chassis battery positive electrode and aerial work vehicle power supply; the operating power supply is connected to No. 1 relay, the No. 1 relay is connected to the left motor pump group, the positive electrode of the chassis battery is connected to the left motor pump group, the aerial work vehicle power supply is connected to No. 2 relay, the No. 2 relay is connected to the left motor pump group, the operating power supply is connected to No. 3 relay, the No. 3 relay is connected to the right motor pump group, the positive electrode of the chassis battery is connected to the right motor pump group, the aerial work vehicle power supply is connected to the time delay relay, the time delay relay is connected to No. 4 relay, and the No. 4 relay is connected to the right motor pump group.

[0006] Further, the No. 1 relay includes a No. 1 normally open contact and a No. 1 coil, the No. 2 relay includes a No. 2 normally closed contact and a No. 2 coil, the No. 3 relay includes a No. 3 normally open contact and a No. 3 coil, and the No. 4 relay includes a No. 4 normally closed contact and a No. 4 coil; the operating power supply contacts the No. 1 normally open contact, and the No. 1 normally open contact is connected to the left motor pump group, the aerial work vehicle power supply contacts the No. 2 normally closed contact, and the No. 2 normally closed contact is connected to the left motor pump group, the No. 1 coil is connected in parallel with the No. 4 coil, and is connected in series with the left motor pump group, and is connected to the ground terminal, the operating power supply contacts the No. 3 normally open contact, and the No. 3 normally open contact is connected to the right motor pump group, the aerial work vehicle power supply is connected to the time delay relay, the time delay relay contacts the No. 4 normally closed contact, and the No. 4 normally closed contact is connected to the right motor pump group, the No. 2 coil is connected in parallel with the No. 3 coil, and is connected in series with the right motor pump group, and is connected to the ground terminal.

[0007] Furthermore, the time delay relay includes a time delay normally open contact and a time delay coil, the aerial work vehicle power supply is in contact with the time delay normally open contact, the time delay normally open contact is in contact with the number four normally closed contact, the aerial work vehicle power supply is connected to the time delay coil, and the time delay coil is connected to the ground terminal.

[0008] Furthermore, the left motor pump group includes a left coil, a left normally open contact and a left temperature control switch, the No. 1 normally open contact is connected to the left coil, the positive pole of the chassis battery is in contact with the left normally open contact, the No. 2 normally closed contact is connected to the left temperature control switch, and the left coil and the left normally open contact are both connected to the ground terminal.

[0009] Furthermore, the right motor pump group includes a right coil, a right normally open contact and a right temperature control switch, the No. 3 normally open contact is connected to the right coil, the positive pole of the chassis battery is in contact with the right normally open contact, the No. 4 normally closed contact is connected to the right temperature control switch, and the right coil and the right normally open contact are both connected to the ground terminal.

[0010] Furthermore, another technical purpose of the present invention is to provide a dual-motor control system for an aerial work vehicle.

[0011] The above technical objectives of the present invention are achieved through the following technical solutions.

[0012] A dual-motor control system for an aerial work vehicle, including the dual-motor control circuit for an aerial work vehicle, has the following structural features: the dual-motor control system for the aerial work vehicle also includes a left motor pump group oil suction pipe, a left motor pump group oil outlet pipe, a right motor pump group oil suction pipe, a right motor pump group oil outlet pipe, a No. 1 oil return pipe, a No. 2 oil return pipe, a valve group, a hydraulic oil tank and an oil return filter; one end of the left motor pump group oil suction pipe is connected to the left motor pump group, the other end of the left motor pump group oil suction pipe is connected to the hydraulic oil tank, and one end of the left motor pump group oil outlet pipe is connected to the left motor pump group Connection, the other end of the left motor pump group oil outlet pipe is connected to the valve group, one end of the right motor pump group oil suction pipe is connected to the right motor pump group, the other end of the right motor pump group oil suction pipe is connected to the hydraulic oil tank, one end of the right motor pump group oil outlet pipe is connected to the right motor pump group, the other end of the right motor pump group oil outlet pipe is connected to the valve group, one end of the No. 1 oil return pipe is connected to the valve group, the other end of the No. 1 oil return pipe is connected to the return oil filter, one end of the No. 2 oil return pipe is connected to the return oil filter, and the other end of the No. 2 oil return pipe is connected to the hydraulic oil tank.

[0013] Furthermore, the left motor pump group and the right motor pump group are both DC motor pump groups.

[0014] Furthermore, both the left motor pump group and the right motor pump group have an overheating protection function.

[0015] Furthermore, when one motor pump group is overheated and protected, it automatically switches to another motor pump group, thereby cyclically achieving the requirement of long-term operation.

[0016] Furthermore, the left motor pump group and the right motor pump group are powered by the battery of the vehicle, and the chassis charges the battery during aerial work.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. When there is no space to install a power take-off device on the vehicle, this solution can serve as a good alternative.

[0019] 2. It can solve the problem that low-voltage DC motor pump groups cannot work for a long time.

[0020] 3. The dual-motor control system of the aerial work vehicle uses a DC motor to drive the hydraulic pump. The power system includes two sets of motor pump groups, and each set of motor pump groups has an overheating protection function. When one set of motor pump groups is overheated, it automatically switches to another set of motor pump groups, so that the cycle can meet the requirements of long-term work. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection of the dual-motor control circuit of the aerial work vehicle according to an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of a dual-motor control system for an aerial work vehicle according to an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of a dual-motor control system for an aerial work vehicle according to an embodiment of the present invention.

[0024] In the figure: No. 1 relay 1, No. 2 relay 2, No. 3 relay 3, No. 4 relay 4, delay relay 5, left motor pump group 6, right motor pump group 7, operating power supply 8, chassis battery positive pole 9, aerial work vehicle power supply 10,

[0025] Normally open contact No. 11, coil No. 12,

[0026] Normally closed contact No. 21, coil No. 22,

[0027] Normally open contact 31, coil 32,

[0028] Normally closed contact 41, coil 42,

[0029] Delay normally open contact 51, delay coil 52,

[0030] Left coil 61, left normally open contact 62, left temperature control switch 63,

[0031] Right coil 71, right normally open contact 72, right temperature control switch 73,

[0032] Left motor pump group oil suction pipe 01, left motor pump group oil outlet pipe 02, right motor pump group oil suction pipe 03, right motor pump group oil outlet pipe 04, No. 1 oil return pipe 05, No. 2 oil return pipe 06, valve group 07, hydraulic oil tank 08, return oil filter 09. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0034] Example

[0035] See also Figures 1 to 3As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0036] Example 1 (see Figure 1 ).

[0037] The aerial work vehicle dual-motor control circuit in this embodiment includes a No. 1 relay 1, a No. 2 relay 2, a No. 3 relay 3, a No. 4 relay 4, a delay relay 5, a left motor pump group 6, a right motor pump group 7, an operating power supply 8, a chassis battery positive electrode 9 and an aerial work vehicle power supply 10; the operating power supply 8 is connected to the No. 1 relay 1, the No. 1 relay 1 is connected to the left motor pump group 6, the chassis battery positive electrode 9 is connected to the left motor pump group 6, the aerial work vehicle power supply 10 is connected to the No. 2 relay 2, the No. 2 relay 2 is connected to the left motor pump group 6, the operating power supply 8 is connected to the No. 3 relay 3, the No. 3 relay 3 is connected to the right motor pump group 7, the chassis battery positive electrode 9 is connected to the right motor pump group 7, the aerial work vehicle power supply 10 is connected to the delay relay 5, the delay relay 5 is connected to the No. 4 relay 4, and the No. 4 relay 4 is connected to the right motor pump group 7.

[0038] In this embodiment, the No. 1 relay 1 includes a No. 1 normally open contact 11 and a No. 1 coil 12, the No. 2 relay 2 includes a No. 2 normally closed contact 21 and a No. 2 coil 22, the No. 3 relay 3 includes a No. 3 normally open contact 31 and a No. 3 coil 32, and the No. 4 relay 4 includes a No. 4 normally closed contact 41 and a No. 4 coil 42; the operating power supply 8 is in contact with the No. 1 normally open contact 11, the No. 1 normally open contact 11 is connected to the left motor pump group 6, the aerial work vehicle power supply 10 is in contact with the No. 2 normally closed contact 21, and the No. 2 normally closed contact 21 is connected to the left motor pump group 6. The motor pump group 6 is connected, the No. 1 coil 12 is connected in parallel with the No. 4 coil 42, and is connected in series with the left motor pump group 6, and is connected to the ground terminal, the operating power supply 8 is in contact with the No. 3 normally open contact 31, the No. 3 normally open contact 31 is connected to the right motor pump group 7, the aerial work vehicle power supply 10 is connected to the delay relay 5, the delay relay 5 is in contact with the No. 4 normally closed contact 41, the No. 4 normally closed contact 41 is connected to the right motor pump group 7, the No. 2 coil 22 is connected in parallel with the No. 3 coil 32, and is connected in series with the right motor pump group 7, and is connected to the ground terminal.

[0039] The delay relay 5 in this embodiment includes a delay normally open contact 51 and a delay coil 52. The aerial work vehicle power supply 10 is in contact with the delay normally open contact 51, the delay normally open contact 51 is in contact with the number four normally closed contact 41, the aerial work vehicle power supply 10 is connected to the delay coil 52, and the delay coil 52 is connected to the ground terminal.

[0040] The left motor pump group 6 in this embodiment includes a left coil 61, a left normally open contact 62 and a left temperature control switch 63. The first normally open contact 11 is connected to the left coil 61, the positive pole 9 of the chassis battery is in contact with the left normally open contact 62, the second normally closed contact 21 is connected to the left temperature control switch 63, and the left coil 61 and the left normally open contact 62 are both connected to the ground terminal.

[0041] The right motor pump group 7 in this embodiment includes a right coil 71, a right normally open contact 72 and a right temperature control switch 73. The No. 3 normally open contact 31 is connected to the right coil 71, the positive pole 9 of the chassis battery is in contact with the right normally open contact 72, the No. 4 normally closed contact 41 is connected to the right temperature control switch 73, and the right coil 71 and the right normally open contact 72 are both connected to the ground terminal.

[0042] Specifically: the operating power supply 8 is connected in series with the No. 1 normally open contact 11 of the No. 1 relay 1 and the left coil 61 of the left motor pump group 6 and then grounded; the aerial work vehicle power supply 10 is connected in series with the No. 2 normally closed contact 21 of the No. 2 relay 2 and the left temperature control switch 63 (closed when the temperature is lower than a certain value) of the left motor pump group 6, and then connected in series with the No. 1 coil 12 of the No. 1 relay 1 and the No. 4 coil 42 of the No. 4 relay 4 which are connected in parallel and then grounded; the positive pole 9 of the chassis battery is connected in series with the left normally open contact 62 of the left motor pump group 6 and then grounded, which constitutes the main circuit and logic control circuit of the left motor pump group 6.

[0043] The operating power supply 8 is connected in series with the No. 3 normally open contact 31 of the No. 3 relay 3 and the right coil 71 of the right motor pump group 7 and then grounded; the aerial work vehicle power supply 10 is connected in series with the delayed normally open contact 51 of the delay relay 5, the No. 4 normally closed contact 41 of the No. 4 relay 4, and the right temperature control switch 73 (closed state when the temperature is lower than a certain value) of the right motor pump group 7, and then connected in series with the No. 3 coil 32 of the No. 3 relay 3 and the No. 2 coil 22 of the No. 2 relay 2 and then grounded; the chassis battery positive pole 9 is connected in series with the right normally open contact 72 of the right motor pump group 7 and then grounded, and the aerial work vehicle power supply 10 is also connected in series with the delay coil 52 of the delay relay 5 and then grounded, which constitute the main circuit and logic control circuit of the right motor pump group 7.

[0044] Before conventional aerial work, the left temperature control switch 63 and the right temperature control switch 73 are both in the closed state. When the aerial work vehicle power supply 10 is turned on, the aerial work vehicle power supply 10 is powered. Because of the existence of the delay relay 5, the delay coil 52 will delay for a certain period of time after being energized to make the delay normally open contact 51 become normally closed. Therefore, the No. 2 normally closed contact 21 of the No. 2 relay 2 and the left temperature control switch 63 are first energized to the No. 1 coil 12 of the No. 1 relay 1 and the No. 4 coil 42 of the No. 4 relay 4. At this time, the No. 1 normally open contact 11 of the No. 1 relay 1 becomes normally closed. When the operating power supply 8 is energized, the left coil 61 of the left motor pump group 6 is energized, the left normally open contact 62 is attracted, and the left motor pump group 6 starts to work; the No. 4 normally closed contact 41 of the No. 4 relay 4 becomes normally open. Even if the delay relay 5 delays for a certain time and the normally open contact 51 becomes normally closed, the No. 3 coil 32 of the No. 3 relay 3 and the No. 2 coil 22 of the No. 2 relay 2 will not be energized, that is, when the left motor pump group 6 works normally, the right motor pump group 7 will not work at the same time.

[0045] After the left motor pump group 6 has worked for a certain period of time, the temperature rises to a certain value, causing the left temperature control switch 63 to be disconnected. At this time, the No. 1 coil 12 of the No. 1 relay 1 and the No. 4 coil 42 of the No. 4 relay 4 lose power, and the No. 1 normally open contact 11 of the No. 1 relay 1 changes from normally closed to normally open, and the left coil 61 of the left motor pump group 6 loses power, and the left normally open contact 62 changes to a normally open state, so the left motor pump group 6 stops working; the No. 4 normally closed contact 41 of the No. 4 relay 4 changes from normally open to normally closed, at this time, the No. 3 coil 32 of the No. 3 relay 3 and the No. 2 coil 22 of the No. 2 relay 2 are energized, and the corresponding No. 3 normally open contact 31 changes from normally open to normally closed, and when the operating power supply 8 is energized, the right coil 71 of the right motor pump group 7 is energized, the right normally open contact 72 is attracted, and the right motor pump group 7 starts working; the No. 2 normally closed contact 21 changes from normally closed to normally open, that is, the left motor pump group 6 is disconnected from the aerial work vehicle power supply 10.

[0046] When the temperature of the left motor pump group 6 cools down, the left temperature control switch 63 is closed again. When the temperature of the right motor pump group 7 has not reached a certain value, the right temperature control switch 73 is still in the closed state, the No. 2 coil 22 of the No. 2 coil 22 is still energized, the No. 2 normally closed contact 21 is still in the normally open state, and the left motor pump group 6 will not work.

[0047] When the right motor pump group 7 reaches a certain temperature value, the right temperature control switch 73 is disconnected and the right motor pump group 7 stops working. At this time, the left temperature control switch 63 of the left motor pump group 6 has been reclosed after natural cooling, and the left motor pump group 6 starts working again, thereby realizing the alternating operation of the dual motors.

[0048] Example 2 (see Figure 2 , 3 ).

[0049] A dual-motor control system for aerial work vehicles, including a dual-motor control circuit for aerial work vehicles, and a left motor pump group oil suction pipe 01, a left motor pump group oil outlet pipe 02, a right motor pump group oil suction pipe 03, a right motor pump group oil outlet pipe 04, a No. 1 oil return pipe 05, a No. 2 oil return pipe 06, a valve group 07, a hydraulic oil tank 08 and an oil return filter 09; one end of the left motor pump group oil suction pipe 01 is connected to the left motor pump group 6, the other end of the left motor pump group oil suction pipe 01 is connected to the hydraulic oil tank 08, one end of the left motor pump group oil outlet pipe 02 is connected to the left motor pump group 6, and the left motor pump group oil outlet The other end of pipe 02 is connected to valve group 07, one end of the right motor pump group oil suction pipe 03 is connected to the right motor pump group 7, the other end of the right motor pump group oil suction pipe 03 is connected to the hydraulic oil tank 08, one end of the right motor pump group oil outlet pipe 04 is connected to the right motor pump group 7, the other end of the right motor pump group oil outlet pipe 04 is connected to valve group 07, one end of the No. 1 oil return pipe 05 is connected to the valve group 07, the other end of the No. 1 oil return pipe 05 is connected to the return oil filter 09, one end of the No. 2 oil return pipe 06 is connected to the return oil filter 09, and the other end of the No. 2 oil return pipe 06 is connected to the hydraulic oil tank 08.

[0050] The left motor pump group 6 and the right motor pump group 7 in this embodiment are both DC motor pump groups. Both the left motor pump group 6 and the right motor pump group 7 have overheat protection functions. When one motor pump group is overheated, it automatically switches to another motor pump group, so that the cycle can meet the requirements of long-term work. The left motor pump group 6 and the right motor pump group 7 are powered by the battery of the car, and the chassis charges the battery when performing aerial work.

[0051] Specifically, during operation, the left motor pump group 6 works, and the right motor pump group 7 does not work first; the left motor pump group 6 draws hydraulic oil from the hydraulic oil tank 08 through the left motor pump group oil suction pipe 01, and then transports the hydraulic oil to the valve group 07 through the left motor pump group oil outlet pipe 02, and then transports it to each mechanism for corresponding action. After the mechanism is actuated, the system hydraulic oil passes through the No. 1 return oil pipe 05, then flows through the return oil filter 09, and flows back to the hydraulic oil tank 08 through the No. 2 return oil pipe 06.

[0052] When the temperature of the left motor pump group 6 reaches the set value, it automatically switches to the right motor pump group 7 for work; when the temperature of the right motor pump group 7 reaches the set value, it automatically switches to the left motor pump group 6 for work. At this time, the left motor pump group 6 has cooled down, and the work is alternated to meet the long-term working requirements.

[0053] Through the above description, those skilled in the art can implement it.

[0054] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A dual-motor control circuit for an aerial work vehicle, characterized in that: The invention comprises a No. 1 relay (1), a No. 2 relay (2), a No. 3 relay (3), a No. 4 relay (4), a time delay relay (5), a left motor pump group (6), a right motor pump group (7), an operating power supply (8), a positive electrode of a chassis battery (9) and a power supply (10) for an aerial work vehicle; the operating power supply (8) is connected to the No. 1 relay (1), the No. 1 relay (1) is connected to the left motor pump group (6), the positive electrode of the chassis battery (9) is connected to the left motor pump group (6), the power supply (10) for the aerial work vehicle is connected to the positive electrode of the chassis battery (9) 10) is connected to the No. 2 relay (2), the No. 2 relay (2) is connected to the left motor pump group (6), the operating power supply (8) is connected to the No. 3 relay (3), the No. 3 relay (3) is connected to the right motor pump group (7), the chassis battery positive electrode (9) is connected to the right motor pump group (7), the aerial work vehicle power supply (10) is connected to the delay relay (5), the delay relay (5) is connected to the No. 4 relay (4), and the No. 4 relay (4) is connected to the right motor pump group (7); The No. 1 relay (1) comprises a No. 1 normally open contact (11) and a No. 1 coil (12); the No. 2 relay (2) comprises a No. 2 normally closed contact (21) and a No. 2 coil (22); the No. 3 relay (3) comprises a No. 3 normally open contact (31) and a No. 3 coil (32); the No. 4 relay (4) comprises a No. 4 normally closed contact (41) and a No. 4 coil (42); the operating power supply (8) contacts the No. 1 normally open contact (11), the No. 1 normally open contact (11) is connected to the left motor pump group (6); the aerial work vehicle power supply (10) contacts the No. 2 normally closed contact (21), the No. 2 normally closed contact (21) is connected to the left motor pump group (6); The first coil (12) is connected to the motor pump group (6), the first coil (12) is connected in parallel with the fourth coil (42), is connected in series with the left motor pump group (6), and is connected to the ground terminal, the operating power supply (8) is in contact with the third normally open contact (31), the third normally open contact (31) is connected to the right motor pump group (7), the aerial work vehicle power supply (10) is connected to the delay relay (5), the delay relay (5) is in contact with the fourth normally closed contact (41), the fourth normally closed contact (41) is connected to the right motor pump group (7), the second coil (22) is connected in parallel with the third coil (32), is connected in series with the right motor pump group (7), and is connected to the ground terminal; The left motor pump assembly (6) comprises a left coil (61), a left normally open contact (62) and a left temperature control switch (63), the first normally open contact (11) is connected to the left coil (61), the positive electrode (9) of the chassis battery is in contact with the left normally open contact (62), the second normally closed contact (21) is connected to the left temperature control switch (63), and the left coil (61) and the left normally open contact (62) are both connected to a ground terminal; The right motor pump assembly (7) comprises a right coil (71), a right normally open contact (72) and a right temperature control switch (73), the third normally open contact (31) is connected to the right coil (71), the positive electrode (9) of the chassis battery is in contact with the right normally open contact (72), the fourth normally closed contact (41) is connected to the right temperature control switch (73), and the right coil (71) and the right normally open contact (72) are both connected to the ground terminal.

2. The dual-motor control circuit for aerial work vehicles according to claim 1 is characterized in that: The time delay relay (5) comprises a time delay normally open contact (51) and a time delay coil (52); the aerial work vehicle power supply (10) contacts the time delay normally open contact (51); the time delay normally open contact (51) contacts a number four normally closed contact (41); the aerial work vehicle power supply (10) is connected to the time delay coil (52); and the time delay coil (52) is connected to a ground terminal.

3. A dual-motor control system for an aerial work vehicle, comprising the dual-motor control circuit for an aerial work vehicle according to any one of claims 1 to 2, characterized in that: The aerial work vehicle dual-motor control system further comprises a left motor pump group oil suction pipe (01), a left motor pump group oil outlet pipe (02), a right motor pump group oil suction pipe (03), a right motor pump group oil outlet pipe (04), a No. 1 oil return pipe (05), a No. 2 oil return pipe (06), a valve group (07), a hydraulic oil tank (08) and an oil return filter (09); one end of the left motor pump group oil suction pipe (01) is connected to the left motor pump group (6), the other end of the left motor pump group oil suction pipe (01) is connected to the hydraulic oil tank (08), one end of the left motor pump group oil outlet pipe (02) is connected to the left motor pump group (6), the other end of the left motor pump group oil outlet pipe (02) is connected to the valve group (09). 7), one end of the right motor pump group oil suction pipe (03) is connected to the right motor pump group (7), the other end of the right motor pump group oil suction pipe (03) is connected to the hydraulic oil tank (08), one end of the right motor pump group oil outlet pipe (04) is connected to the right motor pump group (7), the other end of the right motor pump group oil outlet pipe (04) is connected to the valve group (07), one end of the No. 1 oil return pipe (05) is connected to the valve group (07), the other end of the No. 1 oil return pipe (05) is connected to the oil return filter (09), one end of the No. 2 oil return pipe (06) is connected to the oil return filter (09), and the other end of the No. 2 oil return pipe (06) is connected to the hydraulic oil tank (08).

4. The dual-motor control system for aerial work vehicles according to claim 3 is characterized in that: The left motor pump group (6) and the right motor pump group (7) are both DC motor pump groups.

5. The dual-motor control system for aerial work vehicles according to claim 3 is characterized in that: The left motor pump group (6) and the right motor pump group (7) both have an overheating protection function.

6. The dual-motor control system for aerial work vehicles according to claim 3 is characterized in that: When one motor pump group is overheated, it will automatically switch to another motor pump group, so as to achieve the requirement of long-term operation through this cycle.

7. The dual-motor control system for aerial work vehicles according to claim 3 is characterized in that: The left motor pump group (6) and the right motor pump group (7) are powered by a battery of the vehicle, and the chassis charges the battery when performing aerial work.

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