Three-needle working temperature control system and control method thereof

Abstract

The invention relates to the field of warp knitting machines, in particular to a three-needle working temperature control system and a control method thereof.The three-needle working temperature control system comprises a temperature control piece, a temperature sensing probe and a temperature control device which are arranged on the back face of a knocking-over bar, and the temperature sensing probe is arranged on the knocking-over bar or the temperature control piece; and the temperature sensing probe is in electric signal connection with the temperature control device. The temperature sensing probe monitors the temperature of the back face of the knocking-over bar in real time and transmits a temperature signal to the temperature control device, the temperature control device regulates and controls the temperature of the temperature control piece, heat conduction is conducted between the temperature control piece and the knocking-over bar, the needle piece is arranged next to the knocking-over bar, the knocking-over bar heats the needle piece, and the temperature of the temperature control piece is controlled by the temperature sensing probe. Therefore, the needle piece can be kept in a proper working range, and the needle piece is particularly suitable for equipment with high heat productivity, such as a high-needle-speed warp knitting machine.

Description

Technical Field

[0001] The invention relates to the field of warp knitting machines, and in particular to a three-needle working temperature control system and a control method thereof. Background Art

[0002] The "three needles" of a warp knitting machine usually refer to the three needle bed systems in a three-needle bed warp knitting machine. Each needle bed system includes its own needle bed assembly and a needle bed drive mechanism. The needle parts are made of thin materials and are very sensitive to temperature. Once the ambient temperature changes greatly, they will deform due to thermal expansion and contraction, resulting in failure to work normally. Traditional temperature control methods for needle bed assemblies include: regulating the temperature of the entire workshop through temperature control devices such as air conditioners and fans. This temperature control method consumes too much energy and cannot achieve precise temperature control of the needle bed assembly in a small range. For example, the heat of the hydraulic oil tank at the bottom of the warp knitting machine is used to expand upward to heat the upper undocking plate, needle parts and other parts. This heating method heats the undocking plate indirectly by heating the air between the warp knitting machine and the undocking plate. Not only is the heating path particularly long and the heating effect poor, but no control closed loop is formed, the temperature cannot be accurately controlled, and it only has heating but no cooling function. In order to further improve the heating effect, some equipment in the prior art has been improved accordingly. It heats the swing shaft by injecting oil into the inside. The heat of the swing shaft diffuses to the needle through the air. This improvement can only slightly improve the heating effect. However, due to the fact that the heating source is still far away from the undocking plate, the heat conduction is still poor, and it also does not have the function of precise temperature control. Especially for high-needle speed warp knitting machines, the heat generated is particularly large due to the high-speed movement of the needles. In addition, the gap between the undocking plate and the needles is very small. Once the heat is too high, collision and interference will easily occur, resulting in the equipment being unable to work normally. Therefore, only by reasonably controlling the temperature around the needles can the normal and stable operation of the high-needle speed equipment be guaranteed. In view of this, this case arises. Summary of the invention

[0003] An object of the present invention is to solve at least the above-mentioned problems by a three-needle working temperature control system and a control method thereof.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a three-needle working temperature control system, including a temperature control component, a temperature sensing probe and a temperature control device arranged on the back of the undocking plate, the temperature sensing probe is arranged on the undocking plate or the temperature control component, and the temperature sensing probe is connected to the temperature control device by electrical signals.

[0005] Preferably, a temperature-controlling liquid is introduced into the temperature-controlling component, and two ends of the temperature-controlling component are connected to the temperature control device through a temperature-controlling liquid inlet pipe and a temperature-controlling liquid return pipe, respectively.

[0006] Preferably, the temperature control component is a copper tube closely attached to the back side of the knockout plate, and the copper tube is arranged along the long direction of the knockout plate.

[0007] Preferably, the temperature control member is a flat tube closely attached to the back side of the unbowing plate, and the flat tube is provided with cooling microchannels arranged side by side, and the temperature control liquid is passed through the cooling microchannels.

[0008] Preferably, the temperature sensing probes are arranged at two ends of the unbend plate or on the back side of the unbend plate.

[0009] Preferably, the temperature control device includes a gas-liquid separator, a compressor, a heating heat exchanger, an external heat exchanger, a refrigeration core, a heating core, a temperature control heat exchange core, a first three-way valve, a second three-way valve, a first expansion valve, a second expansion valve, a first water pump and a second water pump. The gas-liquid separator, the compressor, the first three-way valve, the external heat exchanger, the second three-way valve, the second expansion valve and the refrigeration core are connected in sequence to form a refrigeration circuit. The gas-liquid separator, the compressor, the first three-way valve, the heating heat exchanger, the first expansion valve, the external heat exchanger and the second three-way valve are connected in sequence to form an indirect heating circuit. The first water pump, the heating core and the heating heat exchanger form a direct heating circuit. The temperature control heat exchange core exchanges heat with the refrigeration core and the heating core respectively. The temperature control component, the temperature control heat exchange core and the second water pump are connected in sequence to form a temperature control circuit.

[0010] Preferably, the temperature control device further comprises a PTC electric heater, and the PTC electric heater is located in the direct heating circuit, between the heating core and the heating heat exchanger.

[0011] The control method of the three-needle working temperature control system comprises the following steps: initializing the system; collecting the temperature information of the undocking plate by the temperature sensing probe; storing and displaying the temperature of the undocking; when the current temperature of the undocking plate meets the working requirements, feeding back to the system, and no heating or cooling is performed at this time; when the current temperature of the undocking plate does not meet the working requirements, the temperature control device performs heating or cooling to form a control cycle.

[0012] Preferably, the temperature control device performs a cooling operation as follows: the compressor sucks in low-temperature and low-pressure gaseous refrigerant and compresses it into high-temperature and high-pressure gaseous refrigerant, the refrigerant enters the external heat exchanger through the first three-way valve, exchanges heat with the outdoor air, and is liquefied to form high-pressure liquid refrigerant, the high-pressure liquid refrigerant enters the second expansion valve through the second three-way valve, and after throttling, the refrigerant becomes a mixture of low-temperature and low-pressure liquid and gas, and then enters the refrigeration core to exchange heat with the temperature control heat exchange core, and cools the knockout plate through the temperature control circuit; the temperature control device performs a heating operation The working process is as follows: the compressor sucks in low-temperature and low-pressure gaseous refrigerant and compresses it into high-temperature and high-pressure gaseous refrigerant. The refrigerant enters the heating heat exchanger through the first three-way valve and exchanges heat with the direct heating circuit. The heating core in the direct heating circuit exchanges heat with the temperature control heat exchange core, and the knockout plate is cooled by the temperature control circuit. The refrigerant liquefies due to heat release to form high-pressure liquid refrigerant. The high-pressure liquid refrigerant passes through the first expansion valve and becomes a low-temperature and low-pressure liquid and gas mixture after throttling. It then enters the external heat exchanger for heat exchange, absorbs heat from the air, and changes from liquid to gas.

[0013] Preferably, when the indoor temperature is too low, the PTC electric heater is started to perform auxiliary heating on the direct heating circuit.

[0014] From the above description, it can be seen that the three-needle working temperature control system and the control method thereof provided by the present invention have the following beneficial effects: the temperature sensing probe monitors the temperature on the back of the undoing plate in real time and transmits the temperature signal to the temperature control device, the temperature control device regulates the temperature of the temperature control component, heat is conducted between the temperature control component and the undoing plate, and the needle member is arranged next to the undoing plate, and the undoing plate heats the needle member so that the needle member can be kept within a suitable working range, which is particularly suitable for equipment with high needle speed warp knitting machines that generate a lot of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the three-pin working temperature control system.

[0016] Figure 2 for Figure 1 A partial enlarged schematic diagram of .

[0017] Figure 3 This is the system schematic diagram of the three-pin working temperature control system.

[0018] Figure 4 This is the system schematic diagram of the temperature control device.

[0019] Figure 5 It is the flow chart of the control program. DETAILED DESCRIPTION

[0020] The present invention is further described below through specific implementation modes.

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] The traditional temperature control method for the needle bed assembly includes: regulating the temperature of the entire workshop through temperature control devices such as air conditioners and fans. This temperature control method consumes too much energy and cannot achieve precise temperature control of the needle bed assembly in a small range. For example, using the hydraulic oil tank 500 ( Figure 1 The heat of the undoing plate 100 and the needle parts are heated upward. This heating method heats the undoing plate 100 indirectly by heating the air between the warp knitting machine and the undoing plate 100. Not only is the heating path particularly long and the heating effect poor, but it also fails to form a closed control loop and cannot accurately control the temperature. It only has heating but no cooling function. Another example is that oil is injected into the swing shaft 600 for heating. The heat of the swing shaft 600 diffuses to the needle parts through the air. This improvement can only slightly improve the heating effect. However, due to the fact that the heating source is still far away from the undoing plate, the heat conduction is still poor, and it also does not have the function of precise temperature control.

[0023] like Figure 1-3 As shown, the three-needle working temperature control system of the present invention includes a temperature control component 200, a temperature sensing probe 300 and a temperature control device 400 arranged on the back of the undoping plate 100, the temperature sensing probe 300 is arranged on the undoping plate 100 or the temperature control component 200, and the temperature sensing probe 300 is electrically connected to the temperature control device 400. Since the span between the knockover plate 100 and the needles is large, there is thermal expansion and contraction when the temperature changes. Only when all the needle bed components are controlled within a reasonable temperature range can the normal operation of the equipment be guaranteed. The temperature sensing probe 300 monitors the temperature on the back of the knockover plate 100 in real time and transmits the temperature signal to the temperature control device 400. The temperature control device 400 adjusts the temperature of the temperature control component 200. Heat is conducted between the temperature control component 200 and the knockover plate 100. The needles are arranged next to the knockover plate 100. The knockover plate 100 heats the needles so that they can be kept within a suitable working range. The optimal working temperature of the needles is 25 degrees Celsius, and the temperature range can be controlled within plus or minus 2 degrees Celsius, which is particularly suitable for equipment with high heat generation, such as high needle speed warp knitting machines.

[0024] The temperature control liquid is introduced into the temperature control element 200 , and two ends of the temperature control element 200 are connected to the temperature control device 400 through a temperature control liquid inlet pipe and a temperature control liquid return pipe respectively.

[0025] As a preferred embodiment, the temperature control component 200 is a copper tube close to the back of the unhooking plate 100, and the copper tube is arranged along the long direction of the unhooking plate 100. The temperature control liquid is passed into the copper tube to exchange heat with the unhooking plate 100, thereby regulating the temperature of the unhooking plate 100.

[0026] As a preferred embodiment, the temperature control component 200 is also a flat tube close to the back of the unhooking plate 100. The flat tube is provided with cooling microchannels arranged side by side. The temperature control liquid is passed into the cooling microchannel to exchange heat with the unhooking plate 100, thereby regulating the temperature of the unhooking plate 100.

[0027] The temperature sensing probes 300 may be disposed at two ends of the knock-over plate 100 or at the back of the knock-over plate 100 to directly collect the temperature of the knock-over plate 100 .

[0028] The temperature control device 400 includes a gas-liquid separator 1, a compressor 2, a heating heat exchanger 3, an external heat exchanger 4, a refrigeration core 5, a heating core 6, a temperature control heat exchange core 7, a first three-way valve 8, a second three-way valve 9, a first expansion valve 10, a second expansion valve 11, a first water pump 12 and a second water pump 13. The gas-liquid separator 1, the compressor 2, the first three-way valve 8, the external heat exchanger 4, the second three-way valve 9, the second expansion valve 11, and the refrigeration core 5 are connected in sequence to form The refrigeration circuit, the gas-liquid separator 1, the compressor 2, the first three-way valve 8, the heating heat exchanger 3, the first expansion valve 10, the external heat exchanger 4, and the second three-way valve 9 are connected in sequence to form an indirect heating circuit, the first water pump 12, the heating core 6 and the heating heat exchanger 3 form a direct heating circuit, the temperature control heat exchange core 7 exchanges heat with the refrigeration core 5 and the heating core 6 respectively, and the temperature control element 200, the temperature control heat exchange core 7 and the second water pump 13 are connected in sequence to form a temperature control circuit. The refrigeration circuit and the indirect heating circuit share the same gas-liquid separator 1, the compressor 2 and the external heat exchanger 4, and the refrigeration or heating function is realized by switching the first three-way valve 8 and the second three-way valve 9. The temperature control heat exchange core 7, the refrigeration core 5 and the heating core 6 are assembled into a temperature control heat exchanger, and the temperature control heat exchange core 7 and the pipelines of the refrigeration core 5 and the heating core 6.

[0029] The temperature control device 400 further includes a PTC electric heater 14 , which is located in the direct heating circuit and between the heating core 6 and the heating heat exchanger 3 .

[0030] The control method of the three-needle working temperature control system includes the following steps: a control computer is provided in the temperature control device, and the system is initialized; the temperature information of the undoping plate 100 is collected by the temperature sensing probe 300; the temperature of the undoping is stored and displayed; when the current temperature of the undoping plate 100 meets the working requirements, it is fed back to the system, and no heating or cooling is performed at this time; when the current temperature of the undoping plate 100 does not meet the working requirements, the temperature control device 400 performs heating or cooling to form a control cycle, and an alarm is issued when a fault occurs in the temperature control device 400, for example, the working temperature cannot be raised to a suitable working range for a long time.

[0031] The working process of the temperature control device 400 for cooling is as follows: the compressor 2 sucks in low-temperature and low-pressure gaseous refrigerant and compresses it into high-temperature and high-pressure gaseous refrigerant. The refrigerant enters the external heat exchanger 4 through the first three-way valve 8, exchanges heat with the outdoor air, and liquefies to form high-pressure liquid refrigerant. The high-pressure liquid refrigerant enters the second expansion valve 11 through the second three-way valve 9. After throttling, the refrigerant becomes a mixed state of low-temperature and low-pressure liquid and gas, and then enters the refrigeration core 5 to exchange heat with the temperature control heat exchange core 7, and cools the knockout plate 100 through the temperature control circuit; the temperature control device 400 performs the heating work The process is as follows: the compressor 2 sucks in low-temperature and low-pressure gaseous refrigerant and compresses it into high-temperature and high-pressure gaseous refrigerant. The refrigerant enters the heating heat exchanger 3 through the first three-way valve 8 and exchanges heat with the direct heating circuit. The heating core 6 in the direct heating circuit exchanges heat with the temperature control heat exchange core 7, and the knockout plate 100 is cooled by the temperature control circuit. The refrigerant liquefies due to heat release to form high-pressure liquid refrigerant. The high-pressure liquid refrigerant passes through the first expansion valve 10 and becomes a low-temperature and low-pressure liquid and gas mixture after throttling. It then enters the external heat exchanger 4 for heat exchange, absorbs heat from the air, and changes from liquid to gas.

[0032] When the indoor temperature is too low, the PTC electric heater 14 is started to assist heating of the direct heating circuit. When the indoor temperature is lower than 5 degrees Celsius, the PTC electric heater 14 is started to increase the heating speed.

[0033] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. Three-needle working temperature control system, characterized by: It comprises a temperature control part, a temperature sensing probe and a temperature control device arranged on the back of the undoping plate. The temperature sensing probe is arranged on the undoping plate or the temperature control part, and the temperature sensing probe is connected with the temperature control device by electrical signals.

2. The three-needle working temperature control system according to claim 1, characterized in that: The temperature control liquid is introduced into the temperature control component, and the two ends of the temperature control component are connected with the temperature control device through a temperature control liquid inlet pipe and a temperature control liquid return pipe respectively.

3. The three-needle working temperature control system according to claim 2, characterized in that: The temperature control component is a copper tube which is closely attached to the back of the knockout plate, and the copper tube is arranged along the long direction of the knockout plate.

4. The three-needle working temperature control system according to claim 2, characterized in that: The temperature control element is a flat tube that is closely attached to the back of the unbowing plate. The flat tube is provided with cooling microchannels arranged side by side, and the temperature control liquid is passed through the cooling microchannels.

5. The three-needle working temperature control system according to claim 1, characterized in that: The temperature sensing probes are arranged at two ends of the unbend plate or at the back of the unbend plate.

6. The three-needle working temperature control system according to claim 1, characterized in that: The temperature control device includes a gas-liquid separator, a compressor, a heating heat exchanger, an external heat exchanger, a refrigeration core, a heating core, a temperature control heat exchange core, a first three-way valve, a second three-way valve, a first expansion valve, a second expansion valve, a first water pump and a second water pump. The gas-liquid separator, the compressor, the first three-way valve, the external heat exchanger, the second three-way valve, the second expansion valve and the refrigeration core are connected in sequence to form a refrigeration circuit. The gas-liquid separator, the compressor, the first three-way valve, the heating heat exchanger, the first expansion valve, the external heat exchanger and the second three-way valve are connected in sequence to form an indirect heating circuit. The first water pump, the heating core and the heating heat exchanger form a direct heating circuit. The temperature control heat exchange core exchanges heat with the refrigeration core and the heating core respectively. The temperature control component, the temperature control heat exchange core and the second water pump are connected in sequence to form a temperature control circuit.

7. The three-needle working temperature control system according to claim 1, characterized in that: The temperature control device further comprises a PTC electric heater, which is located in the direct heating loop, between the heating core and the heating heat exchanger.

8. The control method of the three-needle working temperature control system according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: initializing the system; collecting the temperature information of the undocking plate by the temperature sensing probe; storing and displaying the temperature of the undocking plate; when the current temperature of the undocking plate meets the working requirements, feeding back to the system, and no heating or cooling is performed at this time; when the current temperature of the undocking plate does not meet the working requirements, heating or cooling is performed by the temperature control device, thus forming a control cycle.

9. The control method of the three-needle working temperature control system according to claim 8, characterized in that: The working process of the temperature control device for cooling is as follows: the compressor sucks in low-temperature and low-pressure gaseous refrigerant and compresses it into high-temperature and high-pressure gaseous refrigerant, the refrigerant enters the external heat exchanger through the first three-way valve, exchanges heat with the outdoor air, and liquefies to form high-pressure liquid refrigerant, the high-pressure liquid refrigerant enters the second expansion valve through the second three-way valve, and after throttling, the refrigerant becomes a mixed state of low-temperature and low-pressure liquid and gas, and then enters the refrigeration core to exchange heat with the temperature control heat exchange core, and cools the ring knockout plate through the temperature control circuit; the working process of the temperature control device for heating The process is as follows: the compressor sucks in low-temperature and low-pressure gaseous refrigerant and compresses it into high-temperature and high-pressure gaseous refrigerant. The refrigerant enters the heating heat exchanger through the first three-way valve and exchanges heat with the direct heating circuit. The heating core in the direct heating circuit exchanges heat with the temperature control heat exchange core, and the knockout plate is cooled by the temperature control circuit. The refrigerant liquefies due to heat release to form high-pressure liquid refrigerant. The high-pressure liquid refrigerant passes through the first expansion valve and becomes a low-temperature and low-pressure liquid and gas mixture after throttling. It then enters the external heat exchanger for heat exchange, absorbs heat from the air, and changes from liquid to gas.

10. The control method of the three-needle working temperature control system according to claim 8, characterized in that: When the indoor temperature is too low, the PTC electric heater is started to assist in heating the direct heating circuit.

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