Hydraulic powered cold storage door with hydraulic temperature monitoring and control function

Abstract

The present invention relates to the field of hydraulic operation control, and is used to solve the problem that the hydraulic system needs a long time to preheat and cannot be started at any time, while the energy consumption of continuously maintaining the preheating state is too high. Specifically, it is a hydraulic power cold storage door with a hydraulic temperature monitoring and control function, including a working hydraulic oil tank and a reserve hydraulic oil tank. The working hydraulic oil tank and the reserve hydraulic oil tank can interact with each other through a valve, and the valve is controlled by a hydraulic temperature monitoring and control system. In the present invention, when the temperature is increased, the high-temperature exhaust gas produced by the cold storage compressor is used to continuously preheat the hydraulic oil through a fine pipeline, which not only maintains the hydraulic oil temperature to always meet the starting temperature, but also avoids the energy loss caused by long-term preheating, thereby improving the timeliness of the hydraulic system when starting, saving the preheating time, and when the temperature is reduced, by actively controlling the exchange of low-temperature hydraulic oil and high-temperature hydraulic oil in the reserve hydraulic oil tank and the working hydraulic oil tank, the temperature control rate of the hydraulic oil is improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic operation control, in particular to a hydraulic power cold storage door with a hydraulic temperature monitoring and control function. Background Art

[0002] In order to ensure its temperature isolation effect, the cold storage door is generally set to be relatively thick, so a large thrust is required to open the cold storage door. The hydraulic system has the effects of small size, low noise and stepless adjustment, which can adapt well to the control operation of the cold storage door. In the hydraulic system, if the hydraulic oil temperature is too low, the viscosity of the hydraulic oil will increase and the fluidity will be poor, the hydraulic pump's oil suction resistance will increase, and cavitation will cause the pump to produce huge noise. Air suction will affect the running parts of the pump. Therefore, the hydraulic oil needs to be preheated before starting the equipment in a low temperature environment; and if the hydraulic system is overheated, the oil viscosity will decrease, the volumetric efficiency will decrease, the oil film will become thinner, the mechanical wear will increase, and the aging of the seals will be accelerated and the life will be shortened. The stability of the hydraulic control system cannot be guaranteed. Therefore, the hydraulic system needs to regulate the hydraulic oil temperature when working;

[0003] At present, the hydraulic temperature control function in the prior art still has shortcomings. The patent document disclosed as CN112032149B discloses a hydraulic station temperature control device, which detects the temperature in the hydraulic oil tank and preheats the hydraulic oil through the casing heating method, thereby avoiding the influence of the cold start of the hydraulic oil. However, the preheating of the hydraulic oil in this scheme needs to be carried out in an active energy supply manner. When the hydraulic system is used at a short interval, it needs to be preheated frequently. At the same time, the preheating method of the hydraulic oil in this scheme is relatively simple, and the preheating time required for the hydraulic oil is relatively long, resulting in a lag in the start of the hydraulic system, and it cannot be started at any time;

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] The present invention is to solve the problem that the hydraulic system takes a long time to preheat and cannot be started at any time, while the energy consumption is too high to maintain the preheating state continuously, and proposes a hydraulic power cold storage door with hydraulic temperature monitoring and control function.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A hydraulically powered cold storage door with a hydraulic temperature monitoring and control function comprises a door cover, which is embedded in the cold storage wall, wherein the cold storage door is slidably connected inside the door cover, a connector is fixedly installed at one end of the cold storage door, a hydraulic rod is arranged on the outer wall of the door cover, a fixed end of the hydraulic rod is connected to the door cover, a telescopic end of the hydraulic rod is connected to the connector, and a hydraulic oil pipe is connected to the tail end of the hydraulic rod;

[0008] One end of the hydraulic oil pipe is connected to a working hydraulic oil tank, an outer wall of the working hydraulic oil tank is provided with an insulation layer, one side of the working hydraulic oil tank is respectively connected with an intake pipeline and an exhaust pipeline, wherein the intake pipeline is connected to the exhaust pipeline of the cold storage compressor through a branch pipeline, the intake pipeline is provided with a branch network inside the working hydraulic oil tank, the outlet end of the branch network converges in the exhaust pipeline, and valves are provided in the intake pipeline and the exhaust pipeline;

[0009] Two groups of control valves are installed at the lower part of the working hydraulic oil tank, the bottom ends of the control valves are connected to the reserve hydraulic oil tank, the outer wall of the reserve hydraulic oil tank is installed with cooling fins, and the control valves are controlled by a hydraulic temperature monitoring and control system.

[0010] As a preferred embodiment of the present invention, the hydraulic temperature supervision and control system includes a temperature monitoring unit, a sub-control calculation unit, an operation statistics unit, an abnormal alarm unit and a controller;

[0011] The temperature monitoring unit is used to collect the hydraulic oil temperature inside the working hydraulic oil tank and the reserve hydraulic oil tank, and record them as the working oil temperature and the reserve oil temperature respectively, and analyze the collected temperatures to generate an oil temperature detection signal, and the temperature monitoring unit sends the oil temperature detection signal to the sub-control calculation unit;

[0012] The sub-control calculation unit analyzes and processes the acquired oil temperature detection signal, generates a corresponding control signal, and sends the control signal to the controller;

[0013] The operation statistics unit is used to collect statistics of the oil temperature detection signal and the control signal, and to perform time correlation analysis on the oil temperature detection signal and the control signal to generate a control feedback signal;

[0014] The controller is used to execute the received control signal, and the abnormal alarm unit generates an alarm reminder according to the control feedback signal.

[0015] As a preferred embodiment of the present invention, the oil temperature detection signal acquired by the temperature monitoring unit includes an oil temperature too high signal, an oil temperature normal signal and an oil temperature too low signal;

[0016] The temperature monitoring unit obtains a preset suitable oil temperature range, compares the working oil temperature with the suitable oil temperature range, and generates a normal oil temperature signal if the working oil temperature is within the suitable oil temperature range; generates a low oil temperature signal if the working oil temperature is less than the lower limit of the suitable oil temperature range; and generates an excessive oil temperature signal if the working oil temperature is higher than the upper limit of the suitable oil temperature range.

[0017] As a preferred embodiment of the present invention, the control signal generated by the sub-control calculation unit includes an oil temperature increase signal and a regulated release volume;

[0018] After obtaining the low oil temperature signal, the sub-control calculation unit immediately generates an oil temperature increase signal and sends the oil temperature increase signal to the controller. The controller controls the valve in the intake pipe to open through the oil temperature increase signal, and introduces the high-temperature exhaust gas of the cold storage compressor into the intake pipe. After obtaining the normal oil temperature signal, the sub-control calculation unit generates a stop heating signal and sends the stop heating signal to the controller. After receiving the stop heating signal, the controller controls the valve in the intake pipe to close.

[0019] As a preferred embodiment of the present invention, after obtaining the oil temperature too high signal, the sub-control calculation unit selects the upper limit value and the lower limit value of the appropriate oil temperature range for arithmetic averaging to obtain the oil temperature control target value T1, the sub-control calculation unit records the working oil temperature as T2, the reserve oil temperature as T3, the sub-control calculation unit records the volume of the working hydraulic oil tank as V, and the sub-control calculation unit obtains the control release volume M through formula analysis, ;

[0020] The sub-control calculation unit sends the regulated release volume M to the controller. After receiving the regulated release volume M, the controller controls the sub-control valve to open. The controller calculates the hydraulic oil flow rate through the flow meter located inside the sub-control valve. After the hydraulic oil flow rate reaches the regulated release volume, all sub-control valves are closed.

[0021] As a preferred embodiment of the present invention, the control feedback signal includes a slow response signal, a slow temperature rise signal, and a control error signal;

[0022] The operation statistics unit obtains the oil temperature is too high signal and the oil temperature is too low signal through the temperature monitoring unit. The operation statistics unit copies the control signal sent by the sub-control calculation unit to the controller. After obtaining the oil temperature is too low signal, the operation statistics unit starts timing. When the controller opens the valve in the intake pipeline, it is marked as the first duration. When the controller closes the valve in the intake pipeline, it is recorded as the second duration and the timing ends.

[0023] As a preferred embodiment of the present invention, the operation statistics unit compares the first duration with a preset response duration, and generates a slow response signal if the first duration is greater than or equal to the preset response duration, and does not respond if the first duration is less than the preset response duration;

[0024] The operation statistics unit obtains the working oil temperature when the oil temperature is too low signal and the working oil temperature after the oil temperature is changed from the oil temperature too low signal to the oil temperature normal signal through the sub-control calculation unit, and calculates the difference between the two sets of working oil temperatures to obtain the oil temperature increase value W. The operation statistics unit generates the oil temperature increase efficiency X through formula analysis. , where t2 is the second time duration, the running statistics unit compares the oil temperature rising efficiency with the preset efficiency threshold. If the oil temperature rising efficiency is less than the preset efficiency threshold, a slow temperature rising signal is generated. If the oil temperature rising efficiency is greater than or equal to the preset efficiency threshold, no response is made.

[0025] As a preferred embodiment of the present invention, after the operation statistics unit obtains the oil temperature is too high signal, the oil temperature control target value T1 is obtained through the sub-control calculation unit. When the sub-control valve is closed, the operation statistics unit obtains the hydraulic oil control temperature in the working hydraulic oil tank, and compares the hydraulic oil control temperature with the oil temperature control target value T1. If the difference between the hydraulic oil control temperature and the oil temperature control target value T1 is within the allowable range, no response is made. If the difference between the hydraulic oil control temperature and the oil temperature control target value T1 is not within the allowable range, a control error signal is generated.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] In the present invention, the hydraulic system is divided into two groups of hydraulic oil tanks, one group is used to store working hydraulic oil, and the other group is used to store low-temperature reserve hydraulic oil. When the hydraulic system is not started, the high-temperature exhaust gas produced by the cold storage compressor is used to continuously preheat the hydraulic oil through a fine pipeline, which not only maintains the hydraulic oil temperature to always meet the starting temperature, but also avoids the energy loss caused by long-term preheating, thereby improving the timeliness of the hydraulic system startup, saving preheating time, and being more suitable for cold storage doors.

[0028] In the present invention, when the temperature of the hydraulic oil in the hydraulic system is controlled, when the temperature is increased, the temperature increase of the hydraulic oil is controlled by actively controlling the amount of high-temperature exhaust gas entering the cold storage compressor; when the temperature is reduced, the exchange of low-temperature hydraulic oil and high-temperature hydraulic oil in the reserve hydraulic oil tank and the working hydraulic oil tank is actively controlled to maintain the oil temperature in the working hydraulic oil tank not exceeding the set upper limit, thereby improving the temperature control rate of the hydraulic oil and making the temperature adjustment of the hydraulic oil faster.

[0029] In the present invention, by collecting and analyzing the temperature control of the hydraulic oil, feedback analysis of the temperature control effect of the hydraulic oil is realized according to the control results shown in the temperature control process, so that when the temperature control effect of the hydraulic oil decreases during long-term use, an alarm reminder can be generated in time to ensure the stable operation of the hydraulic temperature control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0031] Figure 1 It is a structural front view of the present invention;

[0032] Figure 2 is a system block diagram of the present invention;

[0033] Figure 3 It is a system flow chart of the present invention.

[0034] In the figure: 1. Cold storage door; 2. Door frame; 3. Hydraulic rod; 4. Connector; 5. Working hydraulic oil tank; 6. Reserve hydraulic oil tank; 7. Hydraulic oil pipe; 8. Sub-control valve; 9. Intake pipe; 10. Exhaust pipe. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1 - Figure 3 As shown, the hydraulic power cold storage door with hydraulic temperature supervision and control function includes a door cover 2, the door cover 2 is embedded in the cold storage wall, the cold storage door 1 is slidably connected inside the door cover 2, and a connector 4 is fixedly installed at one end of the cold storage door 1 away from the door cover 2. A hydraulic rod 3 is arranged on the outer wall of the door cover 2, the fixed end of the hydraulic rod 3 is connected to the door cover 2, the telescopic end of the hydraulic rod 3 is connected to the connector 4, and the tail end of the hydraulic rod 3 is connected to the hydraulic oil pipe 7;

[0037] One end of the hydraulic oil pipe 7 is connected to the hydraulic rod 3, and the other end is connected to the working hydraulic oil tank 5. The outer wall of the working hydraulic oil tank 5 is provided with an insulation layer, which hinders the heat loss of the hydraulic oil in the working hydraulic oil tank 5 and is used to maintain the hydraulic oil temperature inside the working hydraulic oil tank 5. One side of the working hydraulic oil tank 5 is connected with an intake pipe 9 and an exhaust pipe 10, respectively, wherein the intake pipe 9 is connected to the exhaust pipe of the cold storage compressor through a branch pipe to separate a part of the high-temperature exhaust gas from the exhaust pipe of the cold storage compressor. The intake pipe 9 is provided with a branch pipe network inside the working hydraulic oil tank 5, and the branch pipe network is in contact with the hydraulic oil inside the working hydraulic oil tank 5. After the high-temperature exhaust gas completes the heat exchange with the hydraulic oil in the branch pipe network, it is gathered in the exhaust pipe 10 to discharge the gas. Valves are provided in the intake pipe 9 and the exhaust pipe 10;

[0038] Two groups of control valves 8 are installed at the lower part of the working hydraulic oil tank 5, and the bottom ends of the control valves 8 are connected to the reserve hydraulic oil tank 6;

[0039] The outer wall of the reserve hydraulic oil tank 6 is installed with cooling fins, which accelerate the heat loss of the hydraulic oil in the reserve hydraulic oil tank 6 and reduce the temperature of the hydraulic oil in the reserve hydraulic oil tank 6. Temperature sensors are provided inside the reserve hydraulic oil tank 6 and the working hydraulic oil tank 5, and the sub-control valve 8 is controlled by the hydraulic temperature monitoring and control system.

[0040] Example 2: Please refer to Figure 1 - Figure 3 As shown, the hydraulic temperature supervision and control system includes a temperature monitoring unit, a sub-control calculation unit, an operation statistics unit, an abnormal alarm unit and a controller. The temperature monitoring unit obtains the hydraulic oil temperature in the reserve hydraulic oil tank 6 and the working hydraulic oil tank 5 through the temperature sensors inside the reserve hydraulic oil tank 6 and the working hydraulic oil tank 5, and records them as the reserve oil temperature and the working oil temperature respectively. The temperature monitoring unit obtains a preset suitable oil temperature range and compares the working oil temperature with the suitable oil temperature range. If the working oil temperature is within the suitable oil temperature range, a normal oil temperature signal is generated. If the working oil temperature is less than the lower limit of the suitable oil temperature range, a low oil temperature signal is generated. If the working oil temperature is higher than the upper limit of the suitable oil temperature range, an over-high oil temperature signal is generated.

[0041] The temperature monitoring unit sends the oil temperature normal signal, oil temperature too low signal, oil temperature too high signal, working oil temperature and reserve oil temperature to the sub-control calculation unit;

[0042] After obtaining the oil temperature too low signal, the sub-control calculation unit generates an oil temperature increase signal and sends the oil temperature increase signal to the controller. The controller controls the valve in the air intake pipe 9 to open through the oil temperature increase signal, and introduces the high-temperature exhaust gas of the cold storage compressor into the air intake pipe 9. The high-temperature exhaust gas is used to heat the hydraulic oil in the working hydraulic oil tank 5. After the sub-control calculation unit obtains the oil temperature normal signal, it generates a stop temperature increase signal and sends the stop temperature increase signal to the controller. After receiving the stop temperature increase signal, the controller immediately controls the valve in the air intake pipe 9 to close.

[0043] When the sub-control calculation unit obtains a normal oil temperature signal or an over-high oil temperature signal, the valve in the intake pipe 9 is always kept closed;

[0044] After obtaining the oil temperature over-high signal, the sub-control calculation unit selects the upper limit and the lower limit of the appropriate oil temperature range for arithmetic averaging to obtain the oil temperature control target value T1. The sub-control calculation unit records the working oil temperature as T2 and the reserve oil temperature as T3. The sub-control calculation unit records the volume of the working hydraulic oil tank 5 as V. The sub-control calculation unit obtains the control release volume M through formula analysis. The sub-control calculation unit sends the regulated release volume M to the controller. After receiving the regulated release volume M, the controller controls the sub-control valve 8 to open. The sub-control valve 8 includes at least two groups, one group is used to introduce the hydraulic oil in the working hydraulic oil tank 5 into the reserve hydraulic oil tank 6, and the other group is used to introduce the hydraulic oil in the reserve hydraulic oil tank 6 into the working hydraulic oil tank 5. The controller calculates the hydraulic oil flow rate through the flow meter located inside the sub-control valve 8. After the hydraulic oil flow rate reaches the regulated release volume, all sub-control valves 8 are closed.

[0045] Example 3: Please refer to Figure 1 - Figure 3 As shown, the operation statistics unit obtains the oil temperature too high signal and the oil temperature too low signal through the temperature monitoring unit, and the operation statistics unit copies the control signal sent by the sub-control calculation unit to the controller. After obtaining the oil temperature too low signal, the operation statistics unit performs timing. When the controller opens the valve in the intake pipeline 9, it is marked as the first time length, and when the controller closes the valve in the intake pipeline 9, it is recorded as the second time length and the timing ends;

[0046] The running statistics unit compares the first duration with the preset response duration, and generates a slow response signal if the first duration is greater than or equal to the preset response duration, and does not respond if the first duration is less than the preset response duration;

[0047] The operation statistics unit obtains the working oil temperature when the oil temperature is too low signal and the working oil temperature after the oil temperature is changed from the oil temperature too low signal to the oil temperature normal signal through the sub-control calculation unit, and calculates the difference between the two sets of working oil temperatures to obtain the oil temperature increase value W. The operation statistics unit generates the oil temperature increase efficiency X through formula analysis. , where t2 is the second time length, the running statistical unit compares the oil temperature rising efficiency with the preset efficiency threshold, and if the oil temperature rising efficiency is less than the preset efficiency threshold, a slow temperature rising signal is generated, and if the oil temperature rising efficiency is greater than or equal to the preset efficiency threshold, no response is made;

[0048] After the operation statistics unit obtains the oil temperature too high signal, the oil temperature control target value T1 is obtained through the sub-control calculation unit. When the sub-control valve 8 is closed, the operation statistics unit obtains the hydraulic oil control temperature in the working hydraulic oil tank 5, and compares the hydraulic oil control temperature with the oil temperature control target value T1. If the difference between the hydraulic oil control temperature and the oil temperature control target value T1 is within the allowable range, no response is made. If the difference between the hydraulic oil control temperature and the oil temperature control target value T1 is not within the allowable range, a control error signal is generated.

[0049] The operation statistics unit sends the slow response signal, slow temperature rise signal and control error signal to the abnormal alarm unit. The abnormal alarm unit generates corresponding alarms according to the different signals received and displays them through the display device.

[0050] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Hydraulic power cold storage door with hydraulic temperature supervision and control function, characterized in that: The door cover (2) comprises a door cover (2), the door cover (2) is embedded in the wall of a cold storage, a cold storage door (1) is slidably connected to the door cover (2), a connector (4) is fixedly installed at one end of the cold storage door (1), a hydraulic rod (3) is arranged on the outer wall of the door cover (2), a fixed end of the hydraulic rod (3) is connected to the door cover (2), a telescopic end of the hydraulic rod (3) is connected to the connector (4), and a rear end of the hydraulic rod (3) is connected to a hydraulic oil pipe (7); One end of the hydraulic oil pipe (7) is connected to a working hydraulic oil tank (5), an outer wall of the working hydraulic oil tank (5) is provided with a heat-insulating layer, one side of the working hydraulic oil tank (5) is respectively connected to an intake pipe (9) and an exhaust pipe (10), wherein the intake pipe (9) is connected to an exhaust pipe of a cold storage compressor via a branch pipe, the intake pipe (9) is provided with a branch pipe network inside the working hydraulic oil tank (5), and the outlet end of the branch pipe network converges in the exhaust pipe (10), and valves are provided in the intake pipe (9) and the exhaust pipe (10); Two groups of control valves (8) are installed at the bottom of the working hydraulic oil tank (5), the bottom ends of the control valves (8) are connected to a reserve hydraulic oil tank (6), the outer wall of the reserve hydraulic oil tank (6) is equipped with heat dissipation fins, and the control valves (8) are controlled by a hydraulic temperature monitoring and control system; The hydraulic temperature supervision and control system includes a temperature monitoring unit, a sub-control calculation unit, an operation statistics unit, an abnormal alarm unit and a controller; The temperature monitoring unit is used to collect the temperature of the hydraulic oil in the working hydraulic oil tank (5) and the reserve hydraulic oil tank (6), and record them as the working oil temperature and the reserve oil temperature respectively, and analyze the collected temperatures to generate an oil temperature detection signal, and the temperature monitoring unit sends the oil temperature detection signal to the sub-control calculation unit; The sub-control calculation unit analyzes and processes the acquired oil temperature detection signal, generates a corresponding control signal, and sends the control signal to the controller; The operation statistics unit is used to collect statistics of the oil temperature detection signal and the control signal, and to perform time correlation analysis on the oil temperature detection signal and the control signal to generate a control feedback signal; The controller is used to execute the received control signal, and the abnormal alarm unit generates an alarm reminder according to the control feedback signal; The control feedback signal includes a slow response signal, a slow temperature rise signal, and a control error signal; The operation statistics unit obtains an oil temperature too high signal and an oil temperature too low signal through the temperature monitoring unit, and the operation statistics unit copies the control signal sent by the sub-control calculation unit to the controller. After obtaining the oil temperature too low signal, the operation statistics unit performs timing, and when the controller opens the valve in the intake pipeline (9), it is marked as a first time length, and when the controller closes the valve in the intake pipeline (9), it is recorded as a second time length and the timing ends; The operation statistics unit compares the first time length with the preset response time length, and generates a slow response signal if the first time length is greater than or equal to the preset response time length, and does not respond if the first time length is less than the preset response time length; The operation statistics unit obtains the working oil temperature when the oil temperature is too low signal and the working oil temperature after the oil temperature is changed from the oil temperature too low signal to the oil temperature normal signal through the sub-control calculation unit, and calculates the difference between the two sets of working oil temperatures to obtain the oil temperature increase value W. The operation statistics unit generates the oil temperature increase efficiency X through formula analysis. , where t2 is the second time length, the running statistical unit compares the oil temperature rising efficiency with the preset efficiency threshold, and if the oil temperature rising efficiency is less than the preset efficiency threshold, a slow temperature rising signal is generated, and if the oil temperature rising efficiency is greater than or equal to the preset efficiency threshold, no response is made; After the operation statistics unit obtains the oil temperature too high signal, the oil temperature control target value T1 is obtained through the sub-control calculation unit. When the sub-control valve (8) is closed, the operation statistics unit obtains the hydraulic oil control temperature in the working hydraulic oil tank (5), and compares the hydraulic oil control temperature with the oil temperature control target value T1. If the difference between the hydraulic oil control temperature and the oil temperature control target value T1 is within the allowable range, no response is made. If the difference between the hydraulic oil control temperature and the oil temperature control target value T1 is not within the allowable range, a control error signal is generated.

2. The hydraulic powered cold storage door with hydraulic temperature monitoring and control function according to claim 1 is characterized in that: The oil temperature detection signal obtained by the temperature monitoring unit includes an oil temperature too high signal, an oil temperature normal signal and an oil temperature too low signal; The temperature monitoring unit obtains a preset suitable oil temperature range, compares the working oil temperature with the suitable oil temperature range, and generates a normal oil temperature signal if the working oil temperature is within the suitable oil temperature range; generates a low oil temperature signal if the working oil temperature is less than the lower limit of the suitable oil temperature range; and generates an excessive oil temperature signal if the working oil temperature is higher than the upper limit of the suitable oil temperature range.

3. The hydraulic powered cold storage door with hydraulic temperature monitoring and control function according to claim 1 is characterized in that: The control signals generated by the sub-control calculation unit include an oil temperature increase signal and a regulated release volume; After obtaining the oil temperature is too low signal, the sub-control calculation unit immediately generates an oil temperature increase signal and sends the oil temperature increase signal to the controller. The controller controls the valve in the air intake pipeline (9) to open through the oil temperature increase signal, and introduces the high-temperature exhaust gas of the cold storage compressor into the air intake pipeline (9). After obtaining the oil temperature is normal signal, the sub-control calculation unit generates a stop temperature increase signal and sends the stop temperature increase signal to the controller. After receiving the stop temperature increase signal, the controller controls the valve in the air intake pipeline (9) to close.

4. The hydraulic powered cold storage door with hydraulic temperature monitoring and control function according to claim 3 is characterized in that: After obtaining the oil temperature over-high signal, the sub-control calculation unit selects the upper limit value and the lower limit value of the appropriate oil temperature range and performs arithmetic averaging to obtain the oil temperature control target value T1. The sub-control calculation unit records the working oil temperature as T2 and the reserve oil temperature as T3. The sub-control calculation unit records the volume of the working hydraulic oil tank (5) as V. The sub-control calculation unit obtains the control release volume M through formula analysis. ; The sub-control calculation unit sends the regulated release volume M to the controller. After receiving the regulated release volume M, the controller controls the sub-control valve (8) to open. The controller calculates the flow rate of the hydraulic oil through a flow meter located inside the sub-control valve (8). After the flow rate of the hydraulic oil reaches the regulated release volume, all sub-control valves (8) are closed.

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