Novel cold chain transport vehicle

Abstract

The invention discloses a novel cold chain transport vehicle. The novel cold chain transport vehicle comprises an engine, a clutch structure, a station switching control module, a multi-station gearbox, a transfer case, a hydraulic recovery module, a hydraulic generator module and a refrigeration module. An output shaft of the engine is connected with an input shaft of the multi-station gearbox through a clutch structure; an output shaft of the multi-station gearbox is respectively connected with a front wheel transmission shaft and a rear wheel transmission shaft through a transfer case; a power take-off shaft of the multi-station gearbox is connected with the input end of the hydraulic generator module through the hydraulic recovery module; the output end of the hydraulic generator module is connected with the refrigeration module; the station switching control module is used for connecting an output shaft of the multi-station gearbox with a power take-off shaft of the multi-station gearbox in a first state; and the connecting device is used for connecting the input shaft of the multi-station gearbox with the power take-off shaft of the multi-station gearbox in the second state. According to the scheme, the design of the low-cost and energy-saving cold chain transport vehicle is realized.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of transport vehicles, and in particular to a new type of cold chain transport vehicle. Background Art

[0002] Refrigerated and frozen goods are kept in a specified low temperature environment in all links from production, storage, transportation, sales to consumption to ensure the quality and performance of the goods. It is established with the progress of science and technology and the development of refrigeration technology. It is a low-temperature logistics and transportation process based on refrigeration technology and using refrigeration technology as a means.

[0003] The existing cold chain vehicles in the current prior art are all equipped with two engines, one for refrigeration and the other for travel, which drive the vehicle travel system and the refrigerator refrigeration system respectively; specifically, the travel engine one is controlled by the clutch structure to drive the gearbox, which performs the vehicle's gear shifting and speed regulation, and then drives the transfer case to rotate. The transfer case has two output power take-off ports that respectively drive the front wheel drive shaft and the rear wheel drive shaft, and the two drive shafts respectively drive the front and rear wheels to rotate, driving the vehicle to move; the second engine in the refrigerator drives the generator to generate electricity, which is reasonably configured by the electronic control system to provide a stable and sufficient power supply for the refrigerator refrigeration system; the existing cold chain vehicles all achieve braking by consuming energy through friction between the friction plate and the wheel. Due to the large mass inertia, long braking distance and high braking kinetic energy consumption of the cold chain transport vehicle, the energy consumption is huge in long-distance transportation. This configuration of existing cold chain vehicles will cause the following problems: (1) The use of two engines increases the manufacturing cost of the vehicle; (2) When the cold chain vehicle brakes, mechanical friction is used to consume the kinetic energy of the vehicle's operation, and all the energy is wasted, increasing logistics costs; or a large amount of energy is wasted, which requires more energy to supplement, thereby aggravating environmental pollution and damage; or the existing cold chain vehicles generate heat due to friction, and a large amount of heat will accelerate the wear and aging of components, and excessive heat will burn out friction components. Summary of the invention

[0004] The embodiment of the present invention provides a new type of cold chain transport vehicle to realize the design of a low-cost, energy-saving cold chain transport vehicle, avoiding the problems of high vehicle manufacturing cost, energy waste, and burning of friction components.

[0005] To achieve the above objectives, an embodiment of the present invention provides a novel cold chain transport vehicle, which includes: an engine, a clutch structure, a station switching control module, a multi-station gearbox, a transfer case, a hydraulic recovery module, a hydraulic generator module and a refrigeration module;

[0006] The output shaft of the engine is connected to the input shaft of the multi-position gearbox through the clutch structure; the output shaft of the multi-position gearbox is respectively connected to the front wheel drive shaft and the rear wheel drive shaft through the transfer case; the power take-off shaft of the multi-position gearbox is connected to the input end of the hydraulic generator module through the hydraulic recovery module; the output end of the hydraulic generator module is connected to the refrigeration module;

[0007] The station switching control module is used to connect the output shaft of the multi-station gearbox with the power take-off shaft of the multi-station gearbox in a first state; and to connect the input shaft of the multi-station gearbox with the power take-off shaft of the multi-station gearbox in a second state.

[0008] Optionally, the workstation switching control module is further used to disconnect the input shaft of the multi-station gearbox and the output shaft of the multi-station gearbox from the power take-off shaft of the multi-station gearbox in the third state.

[0009] Optionally, the hydraulic recovery module includes: a brake hydraulic pump, a high-pressure oil circuit, a low-pressure oil circuit, a hydraulic energy recovery unit and a low-pressure oil storage unit;

[0010] The input shaft of the brake hydraulic pump is connected to the power take-off shaft of the multi-position gearbox; the oil outlet of the brake hydraulic pump is connected to the oil inlet of the hydraulic generator module through the high-pressure oil circuit; the oil inlet of the brake hydraulic pump is connected to the oil outlet of the hydraulic generator module through the low-pressure oil circuit;

[0011] The hydraulic energy recovery unit is arranged on the high-pressure oil circuit;

[0012] The low-pressure oil storage unit is arranged on the low-pressure oil circuit.

[0013] Optionally, the workstation switching control module includes a function switching valve;

[0014] The input end of the function switching valve is connected to the outlet of the low-pressure oil storage unit through the first oil circuit; the first output end of the function switching valve is connected to the first control end of the linkage rod in the multi-position gearbox through the second oil circuit;

[0015] The second output end of the function switching valve is connected to the second control end of the linkage rod in the multi-position gearbox through a third oil circuit;

[0016] One end of the connecting rod in the multi-station gearbox is connected to the power take-off shaft of the multi-station gearbox; the other end of the connecting rod in the multi-station gearbox is suspended.

[0017] Optionally, the hydraulic recovery module further includes: an energy storage switch valve and an energy storage pressure regulating valve;

[0018] The energy storage switch valve is arranged on the high-pressure oil line, the energy storage switch valve is in a normally closed state, and the energy storage switch valve comprises two oppositely arranged first pilot ends and a second pilot end, the first pilot end and the spring of the energy storage switch valve are located at the same end, and the second pilot end is communicated with the oil inlet of the energy storage switch valve;

[0019] The energy storage pressure regulating valve, the opening oil pressure of the energy storage pressure regulating valve is adjustable and is in a normally closed state, the energy storage pressure regulating valve includes a first pilot control end and a second pilot control end located at both ends of the valve core and not connected to each other, the first pilot control end is connected to the oil inlet of the energy storage switch valve, the oil inlet of the energy storage pressure regulating valve is connected to the second pilot control end, and the oil outlet of the energy storage pressure regulating valve is connected to the low-pressure oil storage unit.

[0020] Optionally, the hydraulic recovery module further includes: a pressure stabilizing valve and a throttle valve;

[0021] The outlet of the energy storage switch valve is connected to the oil inlet of the hydraulic generator module through the pressure regulating valve and the throttle valve in sequence.

[0022] Optionally, the hydraulic recovery module further includes: a brake torque limiting valve;

[0023] The high-pressure oil circuit is communicated with the low-pressure oil circuit through the brake torque limiting valve.

[0024] Optionally, the hydraulic recovery module further includes: an unloading valve;

[0025] The unloading valve is arranged between the oil outlet of the brake hydraulic pump and the oil inlet of the brake hydraulic pump.

[0026] Optionally, the transport vehicle further comprises a safety relief valve;

[0027] The oil inlet of the hydraulic generator module is communicated with the inlet of the low-pressure oil storage unit through the safety relief valve.

[0028] Optionally, the transport vehicle further comprises: a check valve;

[0029] The oil inlet of the hydraulic generator module is communicated with the inlet of the low-pressure oil storage unit through the check valve.

[0030] In an embodiment of the present invention, a multi-station gearbox is controlled to be in different station states through a station switching control module. When the station switching control module is in the first state, the output shaft of the multi-station gearbox is connected to the power take-off shaft of the multi-station gearbox, and the power take-off shaft of the multi-station gearbox is connected to the input end of the hydraulic generator module through the hydraulic recovery module; the output end of the hydraulic generator module is connected to the refrigeration module; in this way, during the braking process, the front and rear wheel drive shafts drive the transfer case, the transfer case drives the gearbox, and then drives the hydraulic recovery module to prevent the wheels from moving forward; at the same time, the hydraulic recovery module converts the vehicle's braking kinetic energy into hydraulic energy recovery, and automatically releases hydraulic energy under certain conditions. The hydraulic energy is used to drive the hydraulic generator module to generate electricity, thereby providing power for the refrigeration module; in this way, this scheme uses a single generator to achieve refrigeration and driving, thereby reducing the low-cost design of the cold chain vehicle transport vehicle; at the same time, the braking energy is recovered for reuse in the refrigeration module, saving energy and reducing heat generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a new type of cold chain transport vehicle provided by an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the specific structure of a new type of cold chain transport vehicle provided by an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of the specific structure of another novel cold chain transport vehicle provided by an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the specific structure of another new type of cold chain transport vehicle provided by an embodiment of the present invention.

[0035] Figure 5 It is a specific structural schematic diagram of an energy storage switch valve and an energy storage pressure regulating valve provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] Figure 1 is a structural schematic diagram of a new type of cold chain transport vehicle provided by an embodiment of the present invention; Figure 1 As shown, the transport vehicle includes: an engine 10, a clutch structure 20, a station switching control module 30, a multi-station gearbox 40, a transfer case 50, a hydraulic recovery module 60, a hydraulic generator module 70 and a refrigeration module 80;

[0038] The output shaft of the engine 10 is connected to the input shaft A of the multi-position gearbox 40 through the clutch structure 20; the output shaft B of the multi-position gearbox 40 is respectively connected to the front wheel drive shaft and the rear wheel drive shaft through the transfer case 50; the power take-off shaft C of the multi-position gearbox 40 is connected to the input end of the hydraulic generator module 70 through the hydraulic recovery module 60; the output end of the hydraulic generator module 70 is connected to the refrigeration module 80;

[0039] The station switching control module 30 is used to connect the output shaft B of the multi-station gearbox 40 with the power take-off shaft C of the multi-station gearbox 40 in the first state; and to connect the input shaft A of the multi-station gearbox 40 with the power take-off shaft C of the multi-station gearbox 40 in the second state.

[0040] The multi-station gearbox 40 is a transmission that can switch between different station states while realizing the basic shifting function; the different station states of the multi-station gearbox 40 can be switched by the station switching control module 30; the station switching control module 30 can be a hydraulic design structure or an electrical control structure, which is not specifically limited in this embodiment;

[0041] The hydraulic recovery module 60 is a hydraulic transmission component that converts external kinetic energy into hydraulic energy for recovery; the hydraulic generator module 70 is a hydraulic power generation component that converts hydraulic energy into electrical energy;

[0042] In this embodiment, the multi-station gearbox 40 is controlled to be in different station states through the station switching control module 30. When the station switching control module 30 is in the first state, the output shaft B of the multi-station gearbox 40 is connected to the power take-off shaft C of the multi-station gearbox 40, and the power take-off shaft C of the multi-station gearbox 40 is connected to the input end of the hydraulic generator module 70 through the hydraulic recovery module 60; the output end of the hydraulic generator module 70 is connected to the refrigeration module 80; that is, when the station switching control module 30 is in the first state, the transfer case 50 is connected to the hydraulic recovery module 60 through the multi-station gearbox 40, so that during the braking process, the engine 10 is connected to the multi-station gearbox 40 through the clutch structure 20, the input shaft A of the multi-station gearbox 40, and the output shaft A of the multi-station gearbox 40. Axis B and transfer case 50 stop driving the front and rear wheel drive shafts; the front and rear wheel drive shafts drive the transfer case 50 due to the brake inertia, and the transfer case 50 drives the multi-position gearbox 40, and then drives the hydraulic recovery module 60 to prevent the wheels from moving forward; at the same time, the hydraulic recovery module 60 converts the vehicle's braking kinetic energy into hydraulic energy recovery, and automatically releases the hydraulic energy under certain conditions. The hydraulic energy is used to drive the hydraulic generator module 70 to generate electricity, thereby providing power for the refrigeration module 80; in this way, this solution uses a single generator 10 to achieve the dual functions of refrigeration and driving, thereby achieving a low-cost design of the cold chain vehicle transport vehicle; at the same time, the braking energy is recovered as the refrigeration module 80 for reuse, which saves energy, improves energy utilization, and reduces heat generation;

[0043] When the station switching control module 30 is in the second state, the input shaft A of the multi-station gearbox 40 is connected to the power take-off shaft C of the multi-station gearbox 40, and the power take-off shaft C of the multi-station gearbox 40 is connected to the input end of the hydraulic generator module 70 through the hydraulic recovery module 60; the output end of the hydraulic generator module 70 is connected to the refrigeration module 80; that is, when the station switching control module 30 is in the second state, the generator 10 is connected to the hydraulic recovery module 60 through the clutch structure 20 and the multi-station gearbox 40, so that when the hydraulic energy recovered by the hydraulic recovery module 70 during the braking process is not enough to drive the hydraulic generator module 70 to generate electricity, during normal driving of the vehicle, the generator 10 can also drive the hydraulic recovery module 60 to work through the clutch structure 20 and the multi-station gearbox 40, and the hydraulic recovery module 60 converts the engine mechanical energy into hydraulic energy, thereby driving the hydraulic generator module 70 to generate electricity, thereby providing power for the refrigeration module 80; in this way, this scheme realizes the hydraulic recovery method of the hydraulic recovery module 70 under different conditions through the multi-station gearbox 40.

[0044] Optionally, the station switching control module 30 is further used to disconnect the input shaft A of the multi-station gearbox 40, or the output shaft B of the multi-station gearbox 40 from the power take-off shaft C of the multi-station gearbox in the third state. In some scenarios where there is no refrigeration demand, the engine 10 does not need to be connected to the hydraulic recovery module 60; and the transfer case 50 does not need to be connected to the hydraulic recovery module 60, so that the hydraulic recovery module 60 cannot recover hydraulic energy, and thus cannot drive the hydraulic generator module 70 to generate electricity.

[0045] Optionally, based on the above embodiment, the hydraulic recovery module 60 is further refined. Figure 2 Schematic diagram of the specific structure of a new type of cold chain transport vehicle provided by an embodiment of the present invention; Figure 2 As shown, the hydraulic recovery module 60 includes: a brake hydraulic pump 61, a high-pressure oil circuit 62, a low-pressure oil circuit 63, a hydraulic energy recovery unit 64 and a low-pressure oil storage unit 65;

[0046] The input shaft of the brake hydraulic pump 61 is connected to the power take-off shaft C of the multi-position transmission 40; the oil outlet of the brake hydraulic pump 61 is connected to the oil inlet of the hydraulic generator module 70 through the high-pressure oil circuit 62; the oil inlet of the brake hydraulic pump 61 is connected to the oil outlet of the hydraulic generator module 70 through the low-pressure oil circuit 63; the hydraulic energy recovery unit 64 is arranged on the high-pressure oil circuit 62; the low-pressure oil storage unit 65 is arranged on the low-pressure oil circuit 63.

[0047] Among them, the brake hydraulic pump 61 is a pilot-controlled electric proportional pump; the electric proportional pilot-controlled pump operates continuously under the driving control of external force and completes the oil suction and discharge process; the oil discharge volume of the electric proportional pilot-controlled pump is adjustable; the oil discharge volume of the electric proportional pilot-controlled pump is proportional to the travel of the brake pedal, that is, the greater the travel of the brake pedal, the greater the oil discharge volume of the electric proportional pilot-controlled pump, and the more hydraulic energy is recovered by the hydraulic recovery module 60; and the greater the counter-braking force generated at the same time; when the oil discharge volume of the electric proportional pilot-controlled pump is constant, the greater the engine speed or wheel speed, the more hydraulic energy is recovered by the hydraulic recovery module 60;

[0048] Specifically, the hydraulic recovery principle of the hydraulic recovery module 60 is as follows: when the vehicle is braked, the wheel drive shaft is connected to the input shaft of the brake hydraulic pump 61 through the transfer case 50 and the multi-position gearbox 40, the brake hydraulic pump 61 is dragged and rotated by the wheel drive shaft, and the hydraulic oil in the low-pressure oil circuit 63 enters the high-pressure oil circuit 62 through the brake hydraulic pump 61, converts the kinetic energy of vehicle braking into hydraulic energy, and realizes braking of the vehicle; the hydraulic oil in the high-pressure oil circuit 62 enters the hydraulic generator module 70, converts the hydraulic energy into electrical energy for storage, realizes energy recovery during vehicle braking, and drives the hydraulic generator module 70 to generate electricity; and the hydraulic oil coming out of the hydraulic generator module 70 enters the low-pressure oil circuit 63 again, realizes the recycling of hydraulic oil, and saves energy and is environmentally friendly.

[0049] Alternatively, during normal driving of the vehicle, the output shaft of the engine 10 is connected to the input shaft of the brake hydraulic pump 61 through the clutch structure 20 and the multi-position transmission 40. The brake hydraulic pump 61 is dragged and rotated by the engine. The hydraulic oil in the low-pressure oil circuit 63 enters the high-pressure oil circuit 62 through the brake hydraulic pump 61, and the mechanical energy output by the engine 10 is converted into hydraulic energy. The hydraulic oil in the high-pressure oil circuit 62 enters the hydraulic generator module 70, and converts the hydraulic energy into electrical energy to drive the refrigeration module 80. The hydraulic oil coming out of the hydraulic generator module 70 enters the low-pressure oil circuit 63 again, thereby realizing the recycling of the hydraulic oil and saving energy and protecting the environment.

[0050] Optionally, the workstation switching control module 30 is further refined. Figure 3 is a schematic diagram of the specific structure of another novel cold chain transport vehicle provided by an embodiment of the present invention; Figure 3As shown, the workstation switching control module 30 includes a function switching valve 31; the input end of the function switching valve 31 is connected to the outlet of the low-pressure oil storage unit 65 through the first oil circuit; the first output end of the function switching valve 31 is connected to the first control end of the connecting rod L in the multi-station gearbox 40 through the second oil circuit; the second output end of the function switching valve 31 is connected to the second control end of the connecting rod L in the multi-station gearbox 40 through the third oil circuit; one end of the connecting rod L in the multi-station gearbox 40 is connected to the power take-off shaft C of the multi-station gearbox 40; the other end of the connecting rod L in the multi-station gearbox 40 is suspended.

[0051] Among them, in this embodiment, a function switching valve 31 is adopted in the workstation switching control module 30, and the function switching valve 31 uses the hydraulic switching principle to realize the switching of various workstation states of the multi-station gearbox; specifically, when the workstation switching control module 30 is in the first state, the upper solenoid valve corresponding to the function switching valve 31 is energized, and the oil circuit of the low-pressure oil storage unit 65 passes through the upper valve of the function switching valve 31, and drives the first control end of the linkage rod L to move through the first oil circuit, so that the output shaft B of the multi-station gearbox 40 is connected to the power take-off shaft C of the multi-station gearbox; when the workstation switching control module 30 is in the second state, the lower solenoid valve corresponding to the function switching valve 31 is energized, and the oil circuit of the low-pressure oil storage unit 65 passes through the lower valve of the function switching valve 31, and drives the second control end of the linkage rod L to move through the second oil circuit, so that the power take-off shaft C of the multi-station gearbox is connected to the input shaft A of the multi-station gearbox.

[0052] Optionally, based on the above embodiment, the hydraulic recovery module 60 is further optimized. Figure 4 It is a schematic diagram of the specific structure of a new type of cold chain transport vehicle provided by an embodiment of the present invention; Figure 5 is a schematic diagram of the specific structure of an energy storage switch valve and an energy storage pressure regulating valve provided by an embodiment of the present invention; Figure 4-5 As shown, the hydraulic recovery module 60 further includes: an energy storage switch valve 66 and an energy storage pressure regulating valve 67;

[0053] The energy storage switch valve 66 is arranged on the high-pressure oil circuit 62. The energy storage switch valve 66 is in a normally closed state. The energy storage switch valve 66 includes two oppositely arranged first pilot ends 661 and second pilot ends 662. The first pilot end 661 and the spring 663 of the energy storage switch valve 66 are located at the same end, and the second pilot end 662 is connected to the oil inlet of the energy storage switch valve 66.

[0054] The energy storage pressure regulating valve 67, the opening oil pressure of the energy storage pressure regulating valve 67 is adjustable and is in a normally closed state, the energy storage pressure regulating valve 67 includes a first pilot control end 671 and a second pilot control end 672 which are located at both ends of the valve core and are not connected to each other, the first pilot control end 671 is connected to the oil inlet of the energy storage switch valve 66, the oil inlet of the energy storage pressure regulating valve 67 is connected to the second pilot control end 672, and the oil outlet of the energy storage pressure regulating valve 67 is connected to the low-pressure oil storage unit 65.

[0055] Specifically, as the oil pressure in the high-pressure oil circuit 62 gradually increases, the oil pressure at the first pilot control end 671 gradually increases and reaches a set value, the energy storage pressure regulating valve 67 will open under the combined action of the oil pressure at the first pilot control end 671, the oil pressure at the second pilot control end 672 and the energy storage pressure regulating valve 67's own spring, so that the first pilot end 661 of the energy storage switch valve 66 is connected to the hydraulic oil storage unit 65 through the energy storage pressure regulating valve 67, and the first pilot end 661 of the energy storage switch valve 66 is depressurized. The energy storage switch valve 66 will open under the combined action of the force of its own spring and the pressure provided by the oil pressure at the second pilot end 662, so as to provide the hydraulic oil in the high-pressure oil circuit 62 to the hydraulic generator module 70. By adjusting the opening oil pressure and closing oil pressure of the energy storage pressure regulating valve 67, not only can the energy storage switch valve 66 be automatically opened at the set opening pressure and automatically closed at the set closing pressure, but also the requirements for the hydraulic oil flow during hydraulic braking can be met; in this way, the energy storage switch valve 66 and the energy storage pressure regulating valve 67 are used to prevent the hydraulic generator module 70 from being frequently opened due to short-term braking;

[0056] When the pressure provided by the oil pressure at the first pilot control end 671 is less than the force provided by the spring of the energy storage pressure regulating valve 67, the energy storage pressure regulating valve 67 will reset and close. During the resetting process of the energy storage pressure regulating valve 67, the hydraulic oil at the second pilot control end 672 will build up pressure in the first pilot end 661. Since the oil outlet of the energy storage pressure regulating valve 67 is connected to the hydraulic oil storage unit 65, after the energy storage pressure regulating valve 67 is closed, as the oil pressure at the first pilot end 661 of the energy storage switch valve 66 gradually increases, the energy storage switch valve 66 will automatically close under the action of its own spring, so that the opening oil pressure of the energy storage switch valve is greater than the reset oil pressure of the energy storage switch valve 66, so as to make full use of the hydraulic oil in the hydraulic energy recovery unit 64.

[0057] It should be noted that the energy storage switch valve 66 and the energy storage pressure regulating valve 67 can use an existing integrated valve structure, or two separate valves connected by pipelines, which are determined according to actual safety requirements and will not be described in detail here. In other embodiments, when a single hydraulic pressure regulating valve with adjustable opening and reset pressure can meet the requirements of flow rate, pressure, etc., a hydraulic pressure regulating valve with adjustable opening and reset pressure can also be used to replace the above-mentioned energy storage switch valve 66 and energy storage pressure regulating valve 67.

[0058] Optional, continue to refer to Figure 4 The hydraulic recovery module 60 also includes: a pressure regulating valve 68 and a throttle valve 69; the outlet of the energy storage switch valve 66 is connected to the oil inlet of the hydraulic generator module 70 through the pressure regulating valve 68 and the throttle valve 69 in turn. The pressure regulating valve 68 automatically adjusts the pressure difference before and after the throttle valve 69, and the throttle valve 69 adjusts the flow in the high-pressure oil circuit 62 to be constant, so as to provide stable and reliable hydraulic oil for the hydraulic generator module 70, so as to ensure the stability of the hydraulic generator module 70 during power generation.

[0059] Optional, continue to refer to Figure 4 The hydraulic recovery module 60 further includes: a brake torque limiting valve 691; the high-pressure oil circuit 62 is connected to the low-pressure oil circuit 63 through the brake torque limiting valve 691. The brake torque limiting valve 691 is used to limit the maximum brake torque during braking. When the oil pressure in the high-pressure oil circuit 62 is too high, the brake torque limiting valve 691 is opened to connect the high-pressure oil circuit 62 and the low-pressure oil circuit 63, so as to provide high-pressure protection for the high-pressure oil circuit 62.

[0060] Optional, continue to refer to Figure 4 The hydraulic recovery module 60 further includes: a relief valve 692; the relief valve 692 is disposed between the oil outlet of the brake hydraulic pump 61 and the oil inlet of the brake hydraulic pump 61. In this embodiment, when the relief valve 692 is opened, the two oil ports of the brake hydraulic pump 61 are connected to achieve pressure relief of the brake hydraulic pump 61.

[0061] Optional, continue to refer to Figure 4 The transport vehicle further includes a safety relief valve 90; the oil inlet of the hydraulic generator module 70 is connected to the inlet of the low-pressure oil storage unit 65 through the safety relief valve 90. The maximum working oil pressure of the hydraulic generator module 70 is limited by the safety relief valve 90.

[0062] Optional, continue to refer to Figure 4 The transport vehicle further includes a check valve 100; the oil inlet of the hydraulic generator module 70 is connected to the inlet of the low-pressure oil storage unit 65 through the check valve 100. The hydraulic generator module 70 is replenished with oil through the check valve 100 to prevent the hydraulic generator module 70 from being sucked empty, so as to protect the hydraulic generator module 70.

[0063] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A new type of cold chain transport vehicle, characterized in that: include: Engine, clutch structure, station switching control module, multi-station gearbox, transfer case, hydraulic recovery module, hydraulic generator module and refrigeration module; The output shaft of the engine is connected to the input shaft of the multi-position gearbox through the clutch structure; the output shaft of the multi-position gearbox is respectively connected to the front wheel drive shaft and the rear wheel drive shaft through the transfer case; the power take-off shaft of the multi-position gearbox is connected to the input end of the hydraulic generator module through the hydraulic recovery module; the output end of the hydraulic generator module is connected to the refrigeration module; The station switching control module is used to connect the output shaft of the multi-station gearbox with the power take-off shaft of the multi-station gearbox in a first state; Used to connect the input shaft of the multi-position gearbox with the power take-off shaft of the multi-position gearbox in the second state.

2. The new cold chain transport vehicle according to claim 1 is characterized in that: The station switching control module is further used to disconnect the input shaft of the multi-station gearbox and the output shaft of the multi-station gearbox from the power take-off shaft of the multi-station gearbox in the third state.

3. The new cold chain transport vehicle according to claim 1 is characterized in that: The hydraulic recovery module includes: a brake hydraulic pump, a high-pressure oil circuit, a low-pressure oil circuit, a hydraulic energy recovery unit and a low-pressure oil storage unit; The input shaft of the brake hydraulic pump is connected to the power take-off shaft of the multi-position gearbox; the oil outlet of the brake hydraulic pump is connected to the oil inlet of the hydraulic generator module through the high-pressure oil circuit; the oil inlet of the brake hydraulic pump is connected to the oil outlet of the hydraulic generator module through the low-pressure oil circuit; The hydraulic energy recovery unit is arranged on the high-pressure oil circuit; The low-pressure oil storage unit is arranged on the low-pressure oil circuit.

4. The new cold chain transport vehicle according to claim 3 is characterized in that: The station switching control module includes a function switching valve; The input end of the function switching valve is connected to the outlet of the low-pressure oil storage unit through the first oil circuit; the first output end of the function switching valve is connected to the first control end of the linkage rod in the multi-position gearbox through the second oil circuit; The second output end of the function switching valve is connected to the second control end of the linkage rod in the multi-position gearbox through a third oil circuit; One end of the connecting rod in the multi-station gearbox is connected to the power take-off shaft of the multi-station gearbox; the other end of the connecting rod in the multi-station gearbox is suspended.

5. The new cold chain transport vehicle according to claim 3 is characterized in that: The hydraulic recovery module also includes: an energy storage switch valve and an energy storage pressure regulating valve; The energy storage switch valve is arranged on the high-pressure oil line, the energy storage switch valve is in a normally closed state, and the energy storage switch valve comprises two oppositely arranged first pilot ends and a second pilot end, the first pilot end and the spring of the energy storage switch valve are located at the same end, and the second pilot end is communicated with the oil inlet of the energy storage switch valve; The energy storage pressure regulating valve, the opening oil pressure of the energy storage pressure regulating valve is adjustable and is in a normally closed state, the energy storage pressure regulating valve includes a first pilot control end and a second pilot control end located at both ends of the valve core and not connected to each other, the first pilot control end is connected to the oil inlet of the energy storage switch valve, the oil inlet of the energy storage pressure regulating valve is connected to the second pilot control end, and the oil outlet of the energy storage pressure regulating valve is connected to the low-pressure oil storage unit.

6. The new cold chain transport vehicle according to claim 5 is characterized in that: The hydraulic recovery module also includes: a pressure stabilizing valve and a throttle valve; The outlet of the energy storage switch valve is connected to the oil inlet of the hydraulic generator module through the pressure regulating valve and the throttle valve in sequence.

7. The new cold chain transport vehicle according to claim 6 is characterized in that: The hydraulic recovery module further includes: a brake torque limiting valve; The high-pressure oil circuit is communicated with the low-pressure oil circuit through the brake torque limiting valve.

8. The new cold chain transport vehicle according to claim 3 is characterized in that: The hydraulic recovery module further includes: an unloading valve; The unloading valve is arranged between the oil outlet of the brake hydraulic pump and the oil inlet of the brake hydraulic pump.

9. The new cold chain transport vehicle according to claim 3 is characterized in that: It also includes a safety relief valve; The oil inlet of the hydraulic generator module is communicated with the inlet of the low-pressure oil storage unit through the safety relief valve.

10. The new cold chain transport vehicle according to claim 3 is characterized in that: Also includes: Check valve; The oil inlet of the hydraulic generator module is communicated with the inlet of the low-pressure oil storage unit through the check valve.

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