Thermal deformation detection device

Abstract

The invention provides a thermal deformation detection device. The thermal deformation detection device comprises a heating unit, a lifting unit and a measuring unit, the lifting unit is provided with a measuring station, a sample is placed on the measuring station, and the lifting unit puts the sample into the heating unit to be heated. And the measuring unit is used for performing pressure detection on the sample on the measuring station. The measuring process is fully automatic, the measuring efficiency is high, the weight does not need to be manually placed on the weight pan, uneven distribution of force caused by the fact that the weight is not placed in the center of the weight pan can be avoided, and the measuring precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal deformation detection, and in particular relates to a thermal deformation detection device. Background Art

[0002] The existing thermal deformation detector usually places a sample of specified shape and size in a heating device, places a weight on a weight plate, and the temperature when the pressure needle is pressed into the sample surface to a specified depth under the action of the weight gravity is the thermal deformation temperature of the material to be tested. Since the working principle of the thermal deformation detector is to place a weight of a certain weight in the weight plate, the pressure needle is pressed into the sample surface under the action of the weight gravity, and the deformation of the sample is measured by the dial indicator, but due to the weight of the dial indicator, the weight plate and the ejector pin themselves, the error needs to be eliminated through compensation calculation, and the compensation calculation cannot completely eliminate the error, and the weight needs to be placed in the center of the weight plate so that the gravity of the weight plate can be evenly transferred to the ejector pin through the weight plate, but in actual operation, the weight is usually placed manually, which is easy to deviate from the center of the weight plate, resulting in uneven distribution of force and reduced measurement accuracy.

[0003] Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a thermal deformation detection device, which does not use weights, the measurement process is fully automated, and the detection efficiency is improved. It can avoid measurement errors caused by manual placement of weights, and can avoid measurement errors caused by the weight of the dial indicator, weight plate and ejector itself, thereby improving measurement accuracy.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a thermal deformation detection device, including a heating unit, a lifting unit, and a measuring unit, wherein the heating unit heats the sample. A measuring station is provided on the lifting unit, and the sample is placed at the measuring station. The lifting unit places the sample into the heating unit for heating. The measuring unit applies pressure to the sample on the measuring station for detection. During the detection process, it is only necessary to place the sample at the measuring station, and the subsequent detection is fully automatic, with high measurement efficiency. There is no need to manually place the weights on the weight plate, which can avoid uneven force distribution caused by the weights not being placed in the center of the weight plate, thereby improving measurement accuracy.

[0006] Furthermore, in the above-mentioned thermal deformation detection device, the heating unit includes a cavity, oil and a thermocouple are arranged in the cavity, and a resistance heating device is arranged in the cavity. The thermocouple can monitor the temperature of the oil in the cavity in real time, and then control the resistance heating device to heat the oil, so as to achieve precise control of the oil temperature and meet the need for sample heating during the measurement process.

[0007] Furthermore, in the above-mentioned thermal deformation detection device, the lifting unit includes a cylinder, which is connected to the top surface of the heating unit through a bracket, and the cylinder shaft is connected to an upper plate, and the two ends of the upper plate are respectively connected to side plates, which are vertically arranged, and the lower end of the side plate is connected to the lower plate. A limit plate is connected between the two side plates, and the bottom surface of the limit plate is connected to the top surface of the lower plate. The limit plate is arranged at the end of the lower plate away from the measuring unit. The upper plate, the lower plate, the side plate, and the limit plate constitute a measuring station, and the measuring station opening faces the measuring unit, and the sample is placed on the top surface of the lower plate. During the measurement process, the sample is placed on the measuring station, and then the cylinder drives the measuring station to descend until the measuring station is immersed in the oil of the heating unit. The measuring unit extends from the opening of the measuring station and squeezes the sample on the limit plate. The sample is limited by the upper plate and the lower plate respectively, the front and back of the sample are limited by the side plates respectively, and the left and right of the sample are limited by the limit plate and the measuring unit respectively. During the measurement process, the sample is squeezed by the measuring unit and the sample is limited in the measuring station to prevent the sample from being squeezed and sliding out of the measuring station, thereby ensuring the stability of the measurement.

[0008] Furthermore, in the above-mentioned thermal deformation detection device, a slide rail is connected inside the heating unit, the slide rail is vertically arranged, and the side plate is slidably connected to the slide rail. There are one or more slide rails, and the slide rails are slidably connected to the side plates respectively. The slide rails provide a limit for the measuring station to prevent the measuring station from moving during the measurement process and affecting the measurement accuracy.

[0009] Furthermore, in the above-mentioned thermal deformation detection device, the measuring unit includes an ejector mechanism and a thrust mechanism, both of which are arranged horizontally, and the two ends of the ejector mechanism are arranged inside and outside the heating unit respectively, and the ejector mechanism is arranged at one end outside the heating unit and abuts against the thrust mechanism, and a pressure sensing unit is arranged at the abutment between the thrust mechanism and the ejector mechanism. During the measurement process, the thrust mechanism pushes the ejector mechanism, and the ejector mechanism squeezes the sample. The horizontally arranged ejector mechanism and thrust mechanism can avoid the measurement error caused by the weight of the dial indicator, the weight plate and the ejector itself, and improve the measurement accuracy.

[0010] Furthermore, in the above-mentioned thermal deformation detection device, the ejector mechanism includes an ejector frame and an ejector, the ejector frame is connected to the inner wall of the heating unit, the ejector frame is connected to a support plate, the ejector passes horizontally through the inner wall of the heating unit and the support plate, and the ejector is slidably connected to the inner wall of the heating unit and the support plate, respectively. The ejector is slidably connected to the inner wall of the heating unit and the support plate, respectively, which can improve the stability of the ejector, keep the ejector in a horizontal state, and avoid measurement errors caused by the offset of the ejector during the measurement process.

[0011] Furthermore, in the above-mentioned thermal deformation detection device, the thrust mechanism includes a motor, the motor drive is connected to a transmission mechanism, the transmission mechanism drives a push rod, the push rod is arranged parallel to the motor axis, the push rod is provided with an external thread at one end close to the motor, the push rod is slidably connected in the shell, the push rod is threadedly connected to a screw sleeve at one end close to the transmission mechanism, the screw sleeve is rotatably connected in the shell, the motor drives the screw sleeve to rotate through the transmission mechanism, and the screw sleeve drives the push rod to move in the shell. The push rod is connected to the pressure sensing unit at one end away from the transmission mechanism. The motor is set as a servo motor. During the measurement process, the control system controls the output power of the motor according to the measurement data of the pressure sensing unit to ensure that the thrust applied by the ejector pin to the sample is stable at the required vertical position to ensure the measurement accuracy. The servo motor has a position encoder, which can detect the rotation angle of the motor. When the ejector pin contacts the sample, the motor stops, the control system controls the heating unit to heat up, and the control system controls the motor output control to maintain the value required for measurement. As the temperature of the sample rises, the ejector pin begins to move, and the motor sends a rotation signal to the control system. The control system calculates the ejector pin displacement distance based on the received motor rotation signal. When the ejector pin movement distance reaches the measurement standard (usually 1mm), the control system controls the motor to stop. The temperature at this time is the thermal deformation temperature. The above structural design can realize the full automation of the measurement process, and there is no need to use weights. It can avoid the accuracy deviation caused by the weight not being placed in the center of the weight plate. The horizontally set thrust mechanism and ejector pin can avoid the measurement error caused by the weight of the dial indicator, weight plate and ejector pin itself, thereby improving the measurement accuracy.

[0012] Furthermore, in the above-mentioned thermal deformation detection device, there are two or more lifting units, and the measuring unit and the lifting unit are set correspondingly. Multiple lifting units can provide multiple measuring stations, and can simultaneously detect multiple samples, thereby improving the detection efficiency and the equipment utilization rate.

[0013] The detection method is applicable to the above-mentioned thermal deformation detection device, comprising the following steps: S1: Preheat the oil in the heating unit.

[0014] S2: Place the sample at the measuring station.

[0015] S3: The lifting unit drives the sample to descend, and the sample is immersed in the oil of the heating unit 1.

[0016] S4: The measuring unit squeezes the sample for testing.

[0017] S4 includes: S4-1: the motor of the thrust mechanism is started, the motor drives the screw sleeve in the shell to rotate through the transmission mechanism, and the screw sleeve drives the push rod to extend out of the shell.

[0018] S4-2: The push rod pushes the ejector mechanism to move toward the measuring station.

[0019] S4-3: The ejector pin contacts the sample on the measuring station, and the pressure sensing unit provided at the contact point between the thrust mechanism and the ejector pin sends a pressure signal to the control system. The control system receives the pressure signal and starts the heating unit to heat the oil. The control system controls the motor output torque according to the received pressure signal, and then controls the pressure of the ejector pin on the sample, so that the sample is subjected to a constant pressure.

[0020] S4-4: When the position encoder provided on the motor sends the detected signal to the control system, the control system monitors the displacement of the ejector according to the position encoder and generates a displacement curve. When the ejector moves a certain distance, the motor stops.

[0021] S4-5: The motor reverses to drive the ejector to exit, and the lifting unit drives the material to rise, and the detection ends.

[0022] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the thermal deformation detection device of the present invention can measure automatically, can detect multiple samples simultaneously, has high measurement efficiency and high equipment utilization rate. There is no need to manually place the weight on the weight plate, which can avoid uneven force distribution caused by the weight not being placed in the center of the weight plate, and improve measurement accuracy. The horizontally arranged ejector mechanism and thrust mechanism can avoid measurement errors caused by the weight of the dial indicator, the weight plate and the ejector itself, and improve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the thermal deformation detection device of the present invention; Figure 2 is a schematic structural diagram of the heating unit; Figure 3 is a structural schematic diagram of the lifting unit; Figure 4 is a schematic structural diagram of the measuring unit.

[0024] In the figure: 1. heating unit, 11. cavity, 12. slide rail, 13. resistance heating device, 2. lifting unit, 20. measuring station, 21. cylinder, 22. upper plate, 23. side plate, 24. lower plate, 25. limit plate, 3. measuring unit, 31. ejector mechanism, 311. ejector rack, 312. ejector, 313. support plate, 32. thrust mechanism, 321. motor, 322. transmission mechanism, 323. push rod, 324. housing, 33. pressure sensing unit. DETAILED DESCRIPTION

[0025] Example 1 like Figure 1A thermal deformation detection device shown includes a heating unit 1, a lifting unit 2, and a measuring unit 3. The heating unit 1 heats the sample. The lifting unit 2 is provided with a measuring station 20, and the sample is placed at the measuring station 20. The lifting unit 2 puts the sample into the heating unit 1 for heating. The measuring unit 3 applies pressure to the sample on the measuring station 20 for detection. There are one or more lifting units 2, and the measuring unit 3 and the lifting unit 2 are arranged correspondingly.

[0026] like Figure 2 In the thermal deformation detection device shown, the heating unit 1 includes a cavity 11, and oil and a thermocouple are arranged in the cavity 11, and a resistance heating device 13 is arranged in the cavity 11. The thermocouple can monitor the temperature of the oil in the cavity 11 in real time, and then control the resistance heating device 13 to heat the oil, so as to achieve precise control of the oil temperature. A slide rail 12 is connected to the heating unit 1, and the slide rail 12 is vertically arranged, and the side plate 23 is slidably connected to the slide rail 12. There are two or more slide rails 12, and the slide rails 12 are slidably connected to the side plates 23 respectively. The slide rails 12 provide a limit for the measuring station 20 to prevent the measuring station 20 from moving during the measurement process and affecting the measurement accuracy.

[0027] like Figure 3 In the thermal deformation detection device shown, the lifting unit 2 includes a cylinder 21, which is connected to the top surface of the heating unit 1 through a bracket, and the cylinder shaft of the cylinder 21 is connected to an upper plate 22, and the two ends of the upper plate 22 are respectively connected to side plates 23, which are arranged vertically, and the lower end of the side plate 23 is connected to the lower plate 24. A limit plate 25 is connected between the two side plates 23, and the bottom surface of the limit plate 25 is connected to the top surface of the lower plate 24. The limit plate 25 is arranged at the end of the lower plate 24 away from the measuring unit 3. The upper plate 22, the lower plate 24, the side plate 23, and the limit plate 25 constitute a measuring station 20, and the measuring station 20 opens toward the measuring unit 3, and the sample is placed on the top surface of the lower plate 24. During the measurement process, the sample is placed on the measuring station 20, and then the cylinder 21 drives the measuring station 20 to descend until the measuring station 20 is immersed in the oil of the heating unit 1, and the measuring unit 3 extends from the opening of the measuring station 20. The measuring unit 3 squeezes the sample on the limit plate 25. The sample is limited by the upper plate 22 and the lower plate 24 on the top and bottom, the side plate 23 on the front and back, and the limit plate 25 and the measuring unit 3 on the left and right. During the measurement process, the sample is squeezed by the measuring unit 3 and the sample is limited in the measuring station 20.

[0028] like Figure 4In the thermal deformation detection device shown, the measuring unit 3 includes an ejector mechanism 31 and a thrust mechanism 32, both of which are arranged horizontally, and the two ends of the ejector mechanism 31 are arranged on the inner and outer sides of the heating unit 1 respectively, and the ejector mechanism 31 is arranged on the outer side of the heating unit 1 and abuts against the thrust mechanism 32, and a pressure sensing unit 33 is arranged at the abutment between the thrust mechanism 32 and the ejector mechanism 31. The ejector mechanism 31 includes an ejector frame 311 and an ejector 312, the ejector frame 311 is connected to the inner side wall of the heating unit 1, the ejector frame 311 is connected to a support plate 313, the ejector 312 horizontally passes through the inner side wall of the heating unit 1 and the support plate 313, and the ejector 312 is slidably connected to the inner side wall of the heating unit 1 and the support plate 313 respectively. The thrust mechanism 32 includes a motor 321, the motor 321 is driven and connected with a transmission mechanism 322, the transmission mechanism 322 is driven and connected with a push rod 323, the push rod 323 is arranged parallel to the axis of the motor 321, the push rod 323 is provided with an external thread at one end close to the motor 321, the push rod 323 is slidably connected in the housing 324, the push rod 323 is threadedly connected with a screw sleeve at one end close to the transmission mechanism 322, the screw sleeve is rotatably connected in the housing 324, the motor 321 drives the screw sleeve to rotate through the transmission mechanism 322, and the screw sleeve drives the push rod 323 to move in the housing 324. The push rod 323 is connected to the pressure sensing unit 33 at one end away from the transmission mechanism 322. The motor 321 is set as a servo motor. During the measurement process, the control system controls the output power of the motor 321 according to the measurement data of the pressure sensing unit 33, and ensures that the thrust applied by the ejector pin 312 to the sample is stable at the required vertical position to ensure the measurement accuracy. The servo motor has a position encoder, which can detect the rotation angle of the motor 321. When the ejector pin 312 contacts the sample, the motor 321 stops, the control system controls the heating unit 1 to increase the temperature, and the control system controls the output of the motor 321 to maintain the value required for measurement. As the temperature of the sample increases, the ejector pin 312 begins to move, and the motor 321 sends a rotation signal to the control system. The control system calculates the displacement distance of the ejector pin 312 based on the received rotation signal of the motor 321. When the moving distance of the ejector pin 312 reaches the measurement standard (usually 1mm), the control system controls the motor 321 to stop. The temperature at this time is the thermal deformation temperature.

[0029] The detection method is applicable to the above-mentioned thermal deformation detection device, comprising the following steps: S1: Preheating the oil in heating unit 1.

[0030] S2: Place the sample at the measuring station 20.

[0031] S3: The lifting unit 2 drives the sample to descend, and the sample is immersed in the oil of the heating unit 1.

[0032] S4: The measuring unit 3 squeezes the sample for testing.

[0033] S4 includes: S4-1: the motor 321 of the thrust mechanism 32 is started, the motor 321 drives the screw sleeve in the shell 324 to rotate through the transmission mechanism 322, and the screw sleeve drives the push rod 323 to extend out of the shell 324.

[0034] S4-2: The push rod 323 pushes the ejector mechanism 31 to move toward the measuring station 20.

[0035] S4-3: The ejector pin 312 abuts against the sample on the measuring station 20, and the pressure sensing unit 33 provided at the abutment point between the thrust mechanism 32 and the ejector pin 312 sends a pressure signal to the control system. The control system receives the pressure signal and starts the heating unit 1 to heat the oil. The control system controls the motor 321 to output torque according to the received pressure signal, and then controls the pressure of the ejector pin 312 on the sample, so that the ejector pin 312 maintains a certain thrust, so that the sample is subjected to a constant pressure.

[0036] S4-4: When the position encoder provided on the motor 321 sends the detected signal to the control system, the control system monitors the displacement of the ejector mechanism 31 according to the position encoder and generates a displacement curve. When the ejector 312 is displaced a certain distance, the motor 321 stops.

[0037] S4-5: The motor 321 reverses to drive the ejector pin 312 to withdraw, and the lifting unit 2 drives the material to rise, and the detection ends.

[0038] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with this field can understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal deformation detection device, characterized in that: The invention comprises a heating unit (1), a lifting unit (2), and a measuring unit (3), wherein the heating unit (1) heats a sample; the lifting unit (2) is provided with a measuring station (20), the sample is placed on the measuring station (20), and the lifting unit (2) places the sample into the heating unit (1) for heating; and the measuring unit (3) applies pressure to the sample on the measuring station (20) for testing.

2. The thermal deformation detection device according to claim 1, characterized in that: The heating unit (1) comprises a cavity (11), oil and a thermocouple are arranged in the cavity (11), and a resistance heating device (13) is arranged in the cavity (11).

3. The thermal deformation detection device according to claim 1, characterized in that: The lifting unit (2) comprises a cylinder (21), wherein the cylinder (21) is connected to the top surface of the heating unit (1) via a bracket, the cylinder shaft of the cylinder (21) is connected to an upper plate (22), both ends of the upper plate (22) are respectively connected to side plates (23), the side plates (23) are arranged vertically, and the lower ends of the side plates (23) are connected to a lower plate (24); a limiting plate (25) is connected between the two side plates (23), the bottom surface of the limiting plate (25) is connected to the top surface of the lower plate (24), and the limiting plate (25) is arranged at an end of the lower plate (24) away from the measuring unit (3), and the upper plate (22), the lower plate (24), the side plate (23), and the limiting plate (25) constitute a measuring station (20), the measuring station (20) is opened toward the measuring unit (3), and the sample is placed on the top surface of the lower plate (24).

4. The thermal deformation detection device according to claim 3, characterized in that: The heating unit (1) is internally connected to a slide rail (12), the slide rail (12) is arranged vertically, and the side plate (23) and the slide rail (12) are slidably connected.

5. The thermal deformation detection device according to claim 1, characterized in that: The measuring unit (3) comprises a pin mechanism (31) and a thrust mechanism (32); the pin mechanism (31) and the thrust mechanism (32) are both arranged horizontally; two ends of the pin mechanism (31) are respectively arranged inside and outside the heating unit (1); one end of the pin mechanism (31) is arranged outside the heating unit (1) and abuts against the thrust mechanism (32); a pressure sensing unit (33) is provided at the abutment point between the thrust mechanism (32) and the pin mechanism (31).

6. The thermal deformation detection device according to claim 5, characterized in that: The ejector mechanism (31) comprises an ejector frame (311) and an ejector pin (312); the ejector frame (311) is connected to the inner wall of the heating unit (1); the ejector frame (311) is connected to a support plate (313); the ejector pin (312) horizontally passes through the inner wall of the heating unit (1) and the support plate (313); and the ejector pin (312) is slidably connected to the inner wall of the heating unit (1) and the support plate (313), respectively.

7. The thermal deformation detection device according to claim 5, characterized in that: The thrust mechanism (32) comprises a motor (321), the motor (321) is drivably connected to a transmission mechanism (322), the transmission mechanism (322) is drivably connected to a push rod (323), the push rod (323) is arranged parallel to the axis of the motor (321), an end of the push rod (323) close to the motor (321) is provided with an external thread, the push rod (323) is slidably connected to a housing (324), an end of the push rod (323) close to the transmission mechanism (322) is threadably connected to a screw sleeve, the screw sleeve is rotatably connected to the housing (324), the motor (321) drives the screw sleeve to rotate through the transmission mechanism (322), and the screw sleeve drives the push rod (323) to move in the housing (324); the end of the push rod (323) away from the transmission mechanism (322) is connected to a pressure sensing unit (33).

8. The thermal deformation detection device according to claim 1, characterized in that: The lifting unit (2) is provided with one or more units, and the measuring unit (3) and the lifting unit (2) are provided correspondingly.

9. A detection method, applied to the thermal deformation detection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: preheating the oil in the heating unit (1); S2: placing the sample at the measuring station (20); S3: the lifting unit (2) drives the sample to descend, and the sample is immersed in the oil of the heating unit (1); S4: The measuring unit (3) squeezes the sample for testing.

10. The detection method according to claim 9, characterized in that: The S4 comprises: S4-1: the motor (321) of the thrust mechanism (32) is started, the motor (321) drives the screw sleeve in the housing (324) to rotate through the transmission mechanism (322), and the screw sleeve drives the push rod (323) to extend out of the housing (324); S4-2: the push rod (323) pushes the ejector pin (312) to move towards the measuring station (20); S4-3: The ejector pin (312) is brought into contact with the sample on the measuring station (20), and a pressure sensing unit (33) provided at the contact point between the thrust mechanism (32) and the ejector pin (312) sends a pressure signal to the control system. The control system receives the pressure signal and starts the heating unit (1) to heat the oil. The control system controls the motor (321) to output torque according to the received pressure signal, thereby controlling the pressure of the ejector pin (312) on the sample, so that the sample is subjected to a constant pressure. S4-4: The position encoder provided on the motor (321) sends a detected signal to the control system, and the control system monitors the displacement of the ejector pin (312) according to the position encoder and generates a displacement curve. When the ejector pin (312) is displaced a certain distance, the motor (321) stops; S4-5: the motor (321) rotates in reverse to drive the ejector pin (312) to withdraw, and the lifting unit (2) drives the material to rise, and the detection ends.

Images