Gap detection device

Abstract

The invention relates to the technical field of gap detection, in particular to a gap detection device which comprises a control display instrument, an energy storage power supply, a data line, a shell, a sliding seat, a primary side current column, a fitting seat, a permanent magnet, a rotating assembly, a torsion spring, a built-in processor, an infrared sensor, a rotary vane assembly, a sliding ring, a limiting assembly and a sensor assembly. The rotating assembly is installed on the top face of the inner side of the shell in a limited mode, and the torsional spring is installed between the shell and the rotating assembly. When sliding displacement occurs due to contact with the printing platform, air in the shell and the sliding seat is exhausted to form a negative pressure cavity, and air outside the shell is extracted to enter the shell and the sliding seat when the sliding seat is reset, so that the problems that a contact type sensor adopts a detection head to be in contact with the high-temperature printing platform, and the detection precision is low are solved. The internal temperature of the contact type sensor is increased due to heat exchange, so that the permanent magnet is easy to lose magnetism, and the gap value detection precision of the contact type sensor is difficult to guarantee.

Description

Technical Field

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

[0002] A gap detection device is a device that uses sensor technology (contact or non-contact) to calculate and measure the physical distance, contact status, or change trend between the surfaces of two objects. It is widely used in high-precision fields such as mechanical processing, semiconductor manufacturing, and 3D printing.

[0003] The sensors used in gap detection devices are mainly divided into two categories: contact sensors and non-contact sensors. The working principle of contact sensors is mainly based on physical contact, converting the measured physical quantities (such as displacement, pressure, strain, etc.) into electrical signals. Compared with non-contact sensors, contact sensors have the advantage of strong anti-interference ability and are widely used in gap detection devices used in mechanical processing and 3D printing.

[0004] Hall-effect sensors, a type of contact sensor, are widely used in 3D printing because they can detect small changes in physical quantities such as displacement, velocity, or current, achieving high-precision measurements. Their simple structure eliminates the need for complex mechanical components or expensive materials. Hall-effect sensors typically use a probe or sensor head to contact the object being measured. The displacement of the probe or sensor head during contact causes the Hall element to output a corresponding voltage signal, thereby detecting the gap between the two objects.

[0005] To prevent adhesion between the print platform and the printed object, 3D printers often use metal as the printing platform. Frequent contact between the probe and the metal platform causes rapid wear, which in turn reduces the displacement of the Hall element, leading to a decrease in the Hall effect sensor's detection accuracy. Therefore, Hall effect sensors utilize a probe head in contact with the print platform to significantly reduce wear during gap detection. However, during 3D printing, the print platform must be preheated to ensure better adhesion of the printed material. During displacement after contact, the probe head continuously exchanges heat with the print platform, causing the internal temperature of the Hall effect sensor to rise. This causes the permanent magnet within the Hall effect sensor to easily lose its magnetism in high-temperature environments. This not only makes it difficult to guarantee the lifespan of the Hall effect sensor, but also, due to changes in the magnetic strength of the permanent magnet, the voltage signal output by the Hall element is less accurate, making it impossible to guarantee the gap detection accuracy of the Hall effect sensor.

[0006] To this end, a gap detection device is proposed. Summary of the Invention

[0007] The object of the present invention is to provide a gap detection device, which can improve the heat insulation effect by discharging the air inside the shell and the sliding seat when sliding displacement occurs in contact with the printing platform, forming a negative pressure cavity, and drawing air from the outside of the shell into the inside of the shell and the sliding seat when the sliding seat is reset, thereby significantly reducing the internal temperature of the shell in a timely manner. This solves the problem that when the detection head contacts the high-temperature printing platform, the internal temperature of the contact sensor rises due to heat exchange caused by contact, resulting in easy demagnetization of the permanent magnet and difficulty in ensuring the accuracy of gap detection. The device has the advantages of greatly improving the heat insulation effect when in contact with the high-temperature printing platform, and filling the inside of the shell and the sliding seat with low-temperature air when separated from the printing platform, thereby maintaining the ambient temperature of the permanent magnet at a low level. It not only has the effect of extending the service life of the contact sensor, but also has the effect of ensuring the accuracy of gap detection.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A gap detection device includes a control display instrument, an energy storage power supply, a data cable, a housing, a sliding seat, a primary current column, a fitting seat, and a permanent magnet. It also includes a rotating assembly, a torsion spring, a built-in processor, an infrared sensor, a rotary vane assembly, a slip ring, a limit assembly, and a sensor assembly. The rotating assembly is limitedly mounted on the inner top surface of the housing, the torsion spring is mounted between the housing and the rotating assembly, the built-in processor and the infrared sensor are both mounted on the inner wall of the housing, the rotary vane assembly is mounted on the outer circumference of the rotating assembly, the slip ring slides and fits on the inner circumference of the housing, the limit assembly is mounted on the top of the primary current column, and the sensor assembly is mounted and connected to the housing. When the bottom of the sliding seat contacts the substrate, it moves upward along the inner circumference of the housing together with the slip ring, and the limit assembly moves upward along the sliding seat through the primary current column. When the limit assembly moves upward, it drives the rotating assembly to drive the rotary vane assembly to rotate counterclockwise. When the rotary vane assembly rotates, it discharges air from the inside of the housing and the sliding seat, forming a negative pressure inside the housing. When the sliding seat is reset, external air is replenished into the inside of the housing and the sliding seat.

[0010] Preferably, a plurality of air holes are constructed on the top of the shell, and electromagnetic valves are installed in the air holes. When the infrared sensor detects the movement of the slip ring, the built-in processor controls the electromagnetic valve to be in an open state.

[0011] Preferably, a cylindrical groove is constructed on the inner side of the shell, and a limit rod passing through the slip ring is inserted into the cylindrical groove, the bottom of the limit rod is screwed to a limit seat, and the limit seat is screwed to the shell, and the depth of the cylindrical groove is greater than the height of the limit seat.

[0012] Preferably, a circular groove is formed on the bottom of the sliding seat, and a heat insulation sheet with a bottom surface flush with the bottom edge of the sliding seat is attached to the bottom of the sliding seat.

[0013] Preferably, the fitting seat includes a support plate and an insert block, the insert block is inserted into the inner wall of the sliding seat, the support plate is fixed to the end of the insert block, and the support plate is fitted with the permanent magnet.

[0014] Preferably, the rotating assembly includes a rotating cylinder and a spiral groove, the rotating cylinder is rotatably connected to the shell, and the rotating cylinder and the shell are coaxially arranged, and the spiral groove is opened on the inner circumference of the rotating cylinder.

[0015] Preferably, the rotary vane assembly includes a connecting rod, a ring and blades, the connecting rod is installed on the outer circumference of the rotating cylinder, the ring is installed between the ends of multiple connecting rods, and the annular array of blades is installed on the outer circumference of the ring.

[0016] Preferably, the limiting assembly includes a fixed column, a hemispherical protrusion and an insulating sheet, the insulating sheet is attached to the top of the primary current column, the fixed column is installed on the insulating sheet, the hemispherical protrusion is attached to the outer periphery of the fixed column, and the hemispherical protrusion is distributed in a spiral shape, and the hemispherical protrusion is adapted to the spiral groove.

[0017] Preferably, the sensor assembly includes a Hall sensor, a connecting wire and a column, the column is connected to the shell, the Hall sensor is installed at the bottom of the column, and the Hall sensor is located between the ends of the permanent magnet, and the connecting wire is connected between the two Hall sensors.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention is applied to a 3D printing device. During the preparation for a printing operation, a contact sensor is used to detect the gap between the nozzle and the printing platform. To prevent warping, the printing platform needs to be heated to a certain temperature, which causes the housing to exchange heat with the high-temperature printing platform, thereby increasing the temperature inside the housing. In this case, when the sliding seat moves downward with the housing and contacts the printing platform, the sliding seat moves upward relative to the housing. The sliding seat drives the limit assembly upward through the primary current column. The limit assembly drives the rotating assembly and the rotor assembly to rotate. The control solenoid valve is in the open state, which can form a negative pressure space inside the housing and the sliding seat, thereby significantly improving the thermal insulation effect when the sliding seat contacts the printing platform, causing the temperature inside the housing to rise slowly. In addition, when the sliding seat is reset, the control solenoid valve is in the open state, which can quickly pump low-temperature air back into the housing and the sliding seat, thereby significantly reducing the temperature inside the housing, effectively controlling the ambient temperature of the permanent magnet, effectively preventing demagnetization of the permanent magnet, and ensuring the gap detection accuracy of the 3D printing device.

[0020] 2. Through the provided rotating assembly, rotary vane assembly and limit assembly, when the heat insulation sheet at the bottom of the sliding seat contacts the printing platform and the sliding seat moves up along the inner wall of the shell, the limit assembly, in cooperation with the rotating assembly, simultaneously drives the rotating assembly and the rotary vane assembly to rotate counterclockwise. Since the volume of the internal space of the shell and the sliding seat is reduced, the gas density increases. When the rotary vane assembly rotates, a large volume of air can be discharged, thereby greatly reducing the air pressure in the shell and the sliding seat, and a negative pressure state can be formed when the relative displacement of the sliding seat and the shell is large, effectively improving the heat insulation effect when the sliding seat is in contact with the printing platform. Combined with the circular groove and heat insulation sheet provided on the sliding seat, the heat insulation effect when the sliding seat is in contact with the printing platform can be further improved, and the heat exchange efficiency between the sliding seat and the printing platform can be reduced, which is beneficial to reducing the ambient temperature of the permanent magnet.

[0021] 3. Through the provided rotating assembly and torsion spring, when the sliding seat moves upward relative to the shell, the rotating cylinder rotates counterclockwise, and the torsion spring is in a stored force state at this time, thereby making the heat insulation sheet fit tightly against the printing platform, thereby ensuring the accuracy of the gap detection between the nozzle and the printing platform; when the sliding seat is reset and moves downward relative to the sliding seat, the stored force torsion spring can provide driving force for the rotating cylinder, thereby making the fixed column and the rotating cylinder quickly return to their initial positions, which is beneficial to increase the speed at which air enters the shell and the sliding seat, so as to quickly reduce the internal temperature of the shell and the sliding seat, and maintain the permanent magnet in a lower temperature environment, which not only prolongs the service life of the permanent magnet, but also ensures the accuracy of the gap detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a cross-sectional view of the housing of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the primary current column and the limit assembly of the present invention;

[0025] Figure 4 For the present invention Figure 2 A magnified view of the structure at center A;

[0026] Figure 5 It is a structural schematic diagram of the sensor assembly of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the fitting seat of the present invention;

[0028] Figure 7 It is a structural schematic diagram of the rotating assembly and the limiting assembly of the present invention;

[0029] Figure 8 It is a schematic structural diagram of the rotating assembly and the rotary vane assembly of the present invention.

[0030] In the figure: 1. Control and display instrument; 2. Energy storage power supply; 3. Data cable; 4. Housing; 41. Air hole; 42. Solenoid valve; 43. Cylindrical groove; 44. Limit rod; 45. Limit seat; 5. Sliding seat; 51. Circular groove; 52. Heat insulation sheet; 6. Primary current column; 7. Fitting seat; 71. Support plate; 72. Insert block; 8. Permanent magnet; 9. Rotating assembly; 91. Rotating cylinder; 92. Spiral groove; 10. Torsion spring; 11. Built-in processor; 12. Infrared sensor; 13. Rotating vane assembly; 131. Connecting rod; 132. Circular ring; 133. Blade; 14. Slip ring; 15. Limit assembly; 151. Fixed column; 152. Hemispherical protrusion; 153. Insulation sheet; 16. Sensor assembly; 161. Hall sensor; 162. Connecting wire; 163. Column. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0032] See also Figures 1 to 8 The present invention provides a gap detection device, and the technical solution is as follows.

[0033] Reference Figure 1 、 Figure 2 and Figure 3, a gap detection device, including a control display instrument 1, an energy storage power supply 2, a data line 3, a shell 4, a sliding seat 5, a primary current column 6, a fitting seat 7, and a permanent magnet 8. The control display instrument 1 is equipped with a display, a control button and a reset knob. A control host is installed inside the control display instrument 1. The control host is used to analyze and process the feedback gap data. The energy storage power supply 2 is installed on the top of the control display instrument 1. The inner side of the shell 4 is used to install various components of the contact sensor. The data line 3 is connected between the shell 4 and the control display instrument 1, and the end of the data line 3 extends to the inner side of the shell 4. The inner periphery of the shell 4 is structured with a limited sliding groove. The outer periphery of the sliding seat 5 is fitted with the inner periphery of the shell 4. The primary current column 6 is installed on the sliding seat 5, and the primary current column 6 is located at the center of the sliding seat 5. Two fitting seats 7 are symmetrically installed on the inner periphery of the sliding seat 5 about the primary current column 6. The primary current column 6 is connected to the energy storage power supply 2 through a wire. Two semi-annular permanent magnets 8 are divided The two permanent magnets 8 are respectively fitted on the two fitting seats 7, and there is a certain gap between the two ends of the two permanent magnets 8, and the gap can accommodate the Hall sensor 161; it also includes a rotating component 9, a torsion spring 10, a built-in processor 11, an infrared sensor 12, a rotary vane component 13, a slip ring 14, a limit component 15 and a sensor component 16. The rotating component 9 is limitedly mounted on the inner top surface of the shell 4, and a limit bearing is provided on the inner top surface of the shell 4. The top of the rotating component 9 extends to the inside of the limit bearing, and there is a certain gap between the top of the rotating component 9 and the shell 4. The torsion spring 10 is installed between the shell 4 and the rotating component 9. The torsion spring 10 is located in the gap between the rotating component 9 and the shell 4. One end of the torsion spring 10 is plugged into the rotating component 9, and the other end is plugged into the shell 4. When the rotating component 9 rotates counterclockwise, the torsion spring 10 can store force. When the rotating component 9 needs to be reset, the torsion spring 10 can provide driving force for resetting the rotating component 9, thereby accelerating the resetting of the rotating component 9;The built-in processor 11 and the infrared sensor 12 are both installed on the inner wall of the shell 4. A plurality of air holes 41 are constructed on the top of the shell 4, and electromagnetic valves 42 are installed in the air holes 41. When the infrared sensor 12 detects that the slip ring 14 moves, the built-in processor 11 controls the electromagnetic valve 42 to be in an open state. The infrared sensor 12 is connected to the built-in processor 11, and the built-in processor 11 is connected to the control display instrument 1 through the data line 3. The infrared sensor 12 is located above the slip ring 14 and is used to monitor whether the slip ring 14 is displaced, and then control the opening and closing of the electromagnetic valve 42 accordingly. When the slip ring 14 moves up or down, the built-in processor 11 connects the electromagnetic valve 42 circuit to open the electromagnetic valve 42, so that the internal space of the shell 4 and the sliding seat 5 is connected to the outside world, thereby facilitating the change of the air pressure in the internal space of the shell 4 and the sliding seat 5, and improving the thermal insulation effect or timely reducing the temperature by adjusting the air pressure in the internal space. The rotary vane assembly 13 is installed on the outer periphery of the rotating assembly 9, the slip ring 14 slides and fits on the inner periphery of the shell 4, and the limit assembly 15 is installed on the primary current column 6 At the top, the sensor assembly 16 is installed and connected to the shell 4. The sensor assembly 16 extends between the two permanent magnets 8. When the bottom of the sliding seat 5 contacts the substrate, it moves up along the inner periphery of the shell 4 together with the slip ring 14, and the limit assembly 15 moves up along the sliding seat 5 through the primary current column 6. When the limit assembly 15 moves up, it drives the rotating assembly to drive the vane assembly 13 to rotate counterclockwise. When the vane assembly 13 rotates, it discharges the air inside the shell 4 and the sliding seat 5, so that a negative pressure is formed inside the shell 4. The inside of the shell 4 and the sliding seat 5 is in a negative pressure state. In the reset state, the thermal insulation effect between the sliding seat 5 and the housing 4 is effectively improved, preventing heat exchange caused by the contact between the sliding seat 5 and the printing platform, which may cause the internal temperature of the housing 4 to rise too quickly and cause the permanent magnet 8 to lose its magnetism. When the sliding seat 5 is reset, outside air is replenished into the housing 4 and the sliding seat 5. Compared with the air inside the housing 4, the outside air temperature is significantly lower than the air temperature inside the housing 4. Therefore, when the sliding seat 5 is reset, the low-temperature outside air is drawn back into the housing 4 and the sliding seat 5, which can effectively reduce the internal temperature of the housing 4 and the sliding seat 5.

[0034] Reference Figure 4As an embodiment of the present invention, specifically, a cylindrical groove 43 is constructed on the inner side of the shell 4, and a limiting rod 44 is inserted into the cylindrical groove 43 and passes through the slip ring 14. The bottom of the limiting rod 44 is screwed to the limiting seat 45, and the limiting seat 45 is screwed to the shell 4. The depth of the cylindrical groove 43 is greater than the height of the limiting seat 45. Under the action of the cylindrical groove 43, when installing the limiting rod 44, the limiting rod 44 can be placed as a whole in the limiting groove inside the shell 4, and then the limiting rod 44 is screwed to the bottom of the limiting rod 44. The top is inserted into the cylindrical groove 43. When the limit rod 44 abuts against the cylindrical groove 43, the limit seat 45 is screwed to the shell 4, and then the limit rod 44 is lowered, and the limit rod 44 and the limit seat 45 are screwed and fixed. At this time, the top of the limit rod 44 is still in the cylindrical groove 43. Therefore, the limit rod 44 can remain stable under the joint action of the cylindrical groove 43 and the limit seat 45, thereby ensuring the limiting effect of the slip ring 14, and facilitating the disassembly and assembly of the limit rod 44 and the slip ring 14.

[0035] Reference Figure 3 As an embodiment of the present invention, specifically, a circular groove 51 is constructed at the bottom of the sliding seat 5, and a heat insulation sheet 52 whose bottom surface is flush with the bottom edge of the sliding seat 5 is attached to the bottom of the sliding seat 5. When the heat insulation sheet 52 is attached to the sliding seat 5, the circular groove 51 at the bottom of the sliding seat 5 forms a cylindrical cavity, thereby greatly improving the heat insulation effect when the sliding seat 5 contacts the printing platform.

[0036] Reference Figure 5 and Figure 6 As an embodiment of the present invention, specifically, the fitting seat 7 includes a support plate 71 and an insert block 72. The insert block 72 is inserted into the inner wall of the sliding seat 5, the support plate 71 is fixed to the end of the insert block 72, and the support plate 71 is fitted with the permanent magnet 8. The end of the support plate 71 fits with the inner wall of the sliding seat 5. When the insert block 72 is inserted into the inner wall of the sliding seat 5, the fit between the support plate 71 and the inner wall of the sliding seat 5 can improve the stability between the support plate 71 and the insert block 72 and the sliding seat 5, thereby providing stable support for the permanent magnet 8. The permanent magnet 8 maintains a large distance from the bottom of the sliding seat 5 through the fitting seat 7, thereby avoiding the rapid influence of heat exchange on the permanent magnet 8, thereby greatly reducing the demagnetization phenomenon of the permanent magnet 8.

[0037] Reference Figure 2 and Figure 7 As an embodiment of the present invention, specifically, the rotating assembly 9 includes a rotating cylinder 91 and a spiral groove 92. The top of the rotating cylinder 91 extends into the limit bearing. The rotating cylinder 91 is rotatably connected to the shell 4 through the limit bearing. The rotating cylinder 91 and the shell 4 are coaxially arranged, and the spiral groove 92 is opened on the inner circumference of the rotating cylinder 91.

[0038] Reference Figure 8As an embodiment of the present invention, specifically, the rotary vane assembly 13 includes a connecting rod 131, a ring 132 and blades 133. The connecting rod 131 is installed on the outer periphery of the rotating cylinder 91, the ring 132 is installed between the ends of multiple connecting rods 131, and the blades 133 are installed in an annular array on the outer periphery of the ring 132. When the rotating cylinder 91 rotates, the rotating cylinder 91 drives the ring 132 and the blades 133 on the outer periphery of the ring 132 to rotate through the connecting rod 131. Figure 8 The setting direction of the middle blade 133 is such that when the blade 133 rotates counterclockwise, the air inside the shell 4 and the sliding seat 5 can be guided to flow to the outside of the shell 4, and when the blade 133 rotates clockwise, the outside air can be guided to flow into the shell 4 and the sliding seat 5. Then, when the sliding seat 5 is reset, low-temperature air can be added to the shell 4 and the sliding seat 5 in time to reduce the internal temperature of the shell 4 as a whole.

[0039] Reference Figure 3 and Figure 7 As an embodiment of the present invention, specifically, the limiting assembly 15 includes a fixing column 151, a hemispherical protrusion 152 and an insulating sheet 153. The insulating sheet 153 is attached to the top of the primary current column 6. The fixing column 151 is installed on the insulating sheet 153. The fixing column 151 is connected to the primary current column 6 through the insulating sheet 153. When the sliding seat 5 moves upward relative to the housing 4, the fixing column 151 moves upward together with the sliding seat 5 through the insulating sheet 153 and the primary current column 6. The hemispherical protrusion 152 is attached to the outer periphery of the fixing column 151, and the hemispherical protrusion 152 is spiral. The hemispherical protrusion 152 is distributed in a shaped manner, and is adapted to the spiral groove 92. When the fixing column 151 moves upward, since the fixing column 151 only produces vertical displacement, the position of the hemispherical protrusion 152 in the spiral groove 92 is constantly changing, thereby causing the rotating cylinder 91 to rotate counterclockwise under the cooperation of the hemispherical protrusion 152 and the spiral groove 92. The rotating cylinder 91 drives the rotary vane assembly 13 to rotate together, and the air in the shell 4 and the sliding seat 5 is discharged through the air hole 41, thereby reducing the internal air pressure of the shell 4 and the sliding seat 5, and reducing the internal temperature rise rate of the shell 4 and the sliding seat 5.

[0040] Reference Figure 5 As an embodiment of the present invention, specifically, the sensor assembly 16 includes a Hall sensor 161, a connecting wire 162 and a column 163. The column 163 is connected to the housing 4, and the Hall sensor 161 is installed at the bottom of the column 163. The Hall sensor 161 is located between the ends of the permanent magnet 8. The connecting wire 162 is connected between the two Hall sensors 161. When the permanent magnet 8 moves relative to the housing 4 along with the sliding seat 5, the relative position of the Hall sensor 161 and the permanent magnet 8 also changes accordingly. By detecting the output voltage of the Hall sensor 161, the distance between the nozzle and the printing platform can be identified.

[0041] Working principle: When used on 3D printing equipment, the control display instrument 1 is installed at a suitable position of the printing equipment, and the shell 4 is installed beside the nozzle through the bracket, and the bottom of the shell 4 is kept higher than the bottom of the nozzle. When the nozzle height is lowered, the shell 4 and the sliding seat 5 are lowered together with the nozzle. When the nozzle drops to a certain height, the heat insulation plate 52 at the bottom of the sliding seat 5 first contacts the printing platform. In the subsequent process of the nozzle continuing to move downward, the sliding seat 5 is displaced upward compared to the shell 4. At this time, the limit component 15 moves up with the sliding seat 5 through the primary current column 6, and then the limit component 15 is displaced upward compared to the rotating component 9. The limit component 15 drives the rotating component 9 and the rotary vane component 13 to rotate counterclockwise, and the infrared sensor 12 detects the sliding. When the ring 14 moves against the inside of the shell 4, the built-in processor 11 controls the circuit of the solenoid valve 42 to be connected, and the vane assembly 13 discharges the air inside the shell 4 and the sliding seat 5 from the air hole 41, and promptly disconnects the power supply of the solenoid valve 42 and closes the solenoid valve 42 when the slip ring 14 stops moving. When the nozzle performs a printing operation and gradually moves away from the printing platform, as the nozzle rises, the heat insulation sheet 52 at the bottom of the sliding seat 5 gradually separates from the printing platform. Under the action of gravity of the sliding seat 5 and the primary current column 6, the sliding seat 5 slowly moves down and resets. At this time, the rotating assembly and the vane assembly 13 rotate clockwise, and the outside air enters the shell 4 and the sliding seat 5 through the air hole 41, thereby reducing the temperature inside the shell 4 and the sliding seat 5, so that the ambient temperature of the permanent magnet 8 is also reduced.

[0042] Specifically, when the nozzle continues to move downward after the heat insulation sheet 52 contacts the printing platform, the sliding seat 5 moves upward relative to the shell 4. At this time, the fixed column 151 is inserted into the rotating cylinder 91 according to the upward height of the sliding seat 5. Under the cooperation of the hemispherical protrusion 152 and the spiral groove 92, the rotating cylinder 91 drives the rotary vane to rotate counterclockwise through the connecting rod 131 and the ring 132. Because the slip ring 14 is in a moving state, the built-in processor 11 connects the circuit of the solenoid valve 42 at this time, and the rotary vane rotates counterclockwise to discharge the air inside the shell 4 and the sliding seat 5 through the air hole 41, thereby reducing the internal air pressure of the shell 4 and the sliding seat 5. When the sliding seat 5 contacts the printing platform, by reducing the internal air pressure of the shell 4 and the sliding seat 5, the heat exchange rate between the sliding seat 5 and the printing platform can be reduced, thereby avoiding excessive temperature rise inside the shell 4 and the sliding seat 5, so that the internal temperature of the shell 4 and the sliding seat 5 will not exceed the maximum operating temperature of the permanent magnet 8, thereby ensuring the magnetic properties of the permanent magnet 8, extending the service life of the permanent magnet 8, and ensuring the accuracy of the gap detection between the nozzle and the printing platform;

[0043] When the heat insulation sheet 52 gradually separates from the printing platform as the nozzle moves upward, the sliding seat 5 moves downward relative to the shell 4. At this time, the fixed column 151 is gradually pulled out from the rotating cylinder 91 according to the downward height of the sliding seat 5. Under the cooperation of the hemispherical protrusion 152 and the spiral groove 92, the rotating cylinder 91 and the rotary blade rotate clockwise. At this time, under the action of the rotary blade, the outside air is drawn into the shell 4 and the sliding seat 5 through the air hole 41. The outside air temperature is lower than the air temperature inside the shell 4 and the sliding seat 5. Therefore, the supplementary outside air will be neutralized with the original air, thereby greatly reducing the air temperature inside the shell 4 and the sliding seat 5, and timely cooling the permanent magnet 8, further ensuring the magnetism of the permanent magnet 8, so that the service life of the permanent magnet 8 can be further extended, and the gap detection accuracy between the nozzle and the printing platform can be fully guaranteed.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A gap detection device, comprising a control and display instrument, an energy storage power supply, a data cable, a housing, a sliding seat, a primary current column, a fitting seat, and a permanent magnet, characterized in that: It also includes a rotating component, a torsion spring, a built-in processor, an infrared sensor, a rotary vane component, a slip ring, a limit assembly and a sensor component. The rotating component is limited and installed on the inner top surface of the shell, the torsion spring is installed between the shell and the rotating component, the built-in processor and the infrared sensor are both installed on the inner wall of the shell, the rotary vane component is installed on the outer periphery of the rotating component, the slip ring slides and fits on the inner periphery of the shell, the limit assembly is installed on the top of the primary current column, the sensor assembly is installed and connected to the shell, when the bottom of the sliding seat contacts the substrate, it moves up along the inner periphery of the shell together with the slip ring, and the limit assembly moves up with the sliding seat through the primary current column, and when the limit assembly moves up, it drives the rotating component to drive the rotary vane component to rotate counterclockwise together, and when the rotary vane assembly rotates, the air inside the shell and the sliding seat is discharged, so that a negative pressure is formed inside the shell, and when the sliding seat is reset, the outside air is replenished into the shell and the sliding seat.

2. The gap detection device according to claim 1, characterized in that: The top of the shell is configured with a plurality of air holes, and electromagnetic valves are installed in the air holes. When the infrared sensor detects the movement of the slip ring, the built-in processor controls the electromagnetic valve to be in an open state.

3. The gap detection device according to claim 1, characterized in that: A cylindrical groove is constructed on the inner side of the shell, and a limit rod penetrating the slip ring is inserted into the cylindrical groove. The bottom of the limit rod is screwed to a limit seat, and the limit seat is screwed to the shell. The depth of the cylindrical groove is greater than the height of the limit seat.

4. The gap detection device according to claim 1, characterized in that: The bottom of the sliding seat is structured with a circular groove, and the bottom of the sliding seat is attached with a heat insulation sheet whose bottom surface is flush with the bottom edge of the sliding seat.

5. The gap detection device according to claim 4, characterized in that: The fitting seat includes a support plate and an inserting block. The inserting block is inserted into the inner wall of the sliding seat. The support plate is fixed to the end of the inserting block, and the support plate is fitted with the permanent magnet.

6. The gap detection device according to claim 5, characterized in that: The rotating assembly includes a rotating cylinder and a spiral groove. The rotating cylinder is rotatably connected to the shell, and the rotating cylinder and the shell are coaxially arranged. The spiral groove is opened on the inner circumference of the rotating cylinder.

7. The gap detection device according to claim 6, characterized in that: The rotary vane assembly includes a connecting rod, a ring and blades. The connecting rod is installed on the outer periphery of the rotating cylinder. The ring is installed between the ends of multiple connecting rods. The annular array of blades is installed on the outer periphery of the ring.

8. The gap detection device according to claim 6, characterized in that: The limiting assembly includes a fixed column, a hemispherical protrusion and an insulating sheet. The insulating sheet is attached to the top of the primary current column, the fixed column is installed on the insulating sheet, the hemispherical protrusion is attached to the outer periphery of the fixed column, and the hemispherical protrusion is distributed in a spiral shape. The hemispherical protrusion is adapted to the spiral groove.

9. The gap detection device according to claim 6, characterized in that: The sensor assembly includes a Hall sensor, a connecting wire and a column, the column is connected to the shell, the Hall sensor is installed at the bottom of the column, and the Hall sensor is located between the ends of the permanent magnet, and the connecting wire is connected between the two Hall sensors.

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