A gap detection device

Abstract

This invention relates to the field of gap detection technology, specifically a gap detection device, including a control and display instrument, a power storage power supply, a data cable, a housing, a sliding seat, a primary current column, a bonding 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 limiting assembly, and a sensor assembly. The rotating assembly is limited and mounted on the inner top surface of the housing, and the torsion spring is installed between the housing and the rotating assembly. This invention solves the problems of contact sensors, where the probe contacts a high-temperature printing platform, causing internal temperature rise due to heat exchange, leading to demagnetization of the permanent magnet and difficulty in guaranteeing the accuracy of gap detection. These problems arise because the contact sensor's internal temperature rises due to heat exchange, which in turn causes the permanent magnet to easily lose magnetism.

Description

Technical Field

[0001] This invention relates to the field of gap detection technology, specifically to a gap detection device. Background Technology

[0002] Gap detection devices are equipment that use sensor technology (contact or non-contact) to calculate and measure the physical distance, contact state, or trend of change between the surfaces of two objects. They are widely used in high-precision fields such as machining, 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, which converts the measured physical quantity (such as displacement, pressure, strain, etc.) into an electrical signal. Compared with non-contact sensors, contact sensors have the advantage of strong anti-interference ability and are widely used in gap detection devices in the fields of machining and 3D printing.

[0004] Hall effect sensors, a type of contact sensor, are widely used in 3D printing due to their ability to detect very small changes in physical quantities such as displacement, velocity, or current, enabling high-precision measurements. Furthermore, their simple structure, requiring no complex mechanical parts or expensive materials, contributes to their popularity. Hall effect sensors typically use a probe or detection head that contacts the object being measured. The displacement of the probe or detection head during contact causes the Hall element to correspondingly change its output voltage signal, thereby detecting the size of the gap between the two objects.

[0005] To prevent the printing platform from sticking to the printed material, 3D printer platforms are often made of metal. Frequent contact between the probe and the metal platform leads to rapid wear, reducing the displacement of the Hall element and consequently decreasing the accuracy of the Hall effect sensor. Therefore, Hall effect sensors utilize a detection head that contacts the printing platform to significantly reduce wear during gap detection. However, during 3D printing, the platform needs to be preheated to ensure better material adhesion. During the probe's displacement after contact with the platform, continuous heat exchange occurs, causing the internal temperature of the Hall effect sensor to rise. This high temperature environment can cause the permanent magnet inside the sensor to demagnetize, compromising the sensor's lifespan and, due to changes in the magnet's strength, resulting in inaccurate voltage signals from the Hall element, further compromising gap detection accuracy.

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

[0007] The purpose of this invention is to provide a gap detection device. By creating a negative pressure cavity by expelling air from the housing and sliding seat when sliding displacement occurs upon contact with the printing platform, the device improves heat insulation. Furthermore, by drawing air from the outside of the housing into the housing and sliding seat when the sliding seat resets, the device significantly reduces the internal temperature of the housing. This solves the problem of increased internal temperature of contact sensors caused by heat exchange when the probe contacts a high-temperature printing platform, leading to demagnetization of the permanent magnet and difficulty in ensuring gap detection accuracy. The device significantly improves heat insulation when in contact with a high-temperature printing platform and allows low-temperature air to be introduced into the housing and sliding seat when separated from the printing platform, thereby maintaining the ambient temperature of the permanent magnet at a low level. This not only extends the service life of the contact sensor but also ensures accurate gap detection.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[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 bonding seat, and a permanent magnet. It also includes a rotating assembly, a torsion spring, a built-in processor, an infrared sensor, a swivel assembly, a slip ring, a limiting assembly, and a sensor assembly. The rotating assembly is limited and mounted on the top inner 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 swivel assembly is mounted on the outer periphery of the rotating assembly. The slip ring slides against the inner periphery of the housing. The limiting assembly is mounted on the top of the primary current column. 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 periphery of the housing along with the slip ring. The limiting assembly moves upward along with the sliding seat via the primary current column. When the limiting assembly moves upward, it drives the rotating assembly to rotate the swivel assembly counterclockwise. When the swivel assembly rotates, it expels air from the housing and the sliding seat, creating a negative pressure inside the housing. When the sliding seat resets, external air is replenished into the housing and the sliding seat.

[0010] Preferably, the top of the housing has multiple air holes, and each air hole is equipped with a solenoid valve. When the infrared sensor detects the movement of the slip ring, the built-in processor controls the solenoid valve to be in the open state.

[0011] Preferably, the inner side of the housing has a cylindrical groove, and a limiting rod through the slip ring is inserted in the cylindrical groove. The bottom of the limiting rod is screwed to a limiting seat, and the limiting seat is screwed to the housing. The depth of the cylindrical groove is greater than the height of the limiting seat.

[0012] Preferably, the bottom of the sliding seat has a circular groove, and a heat insulation sheet with its 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 and installed 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 housing and is coaxially arranged with the housing. The spiral groove is formed on the inner circumference of the rotating cylinder.

[0015] Preferably, the rotor assembly includes connecting rods, a ring, and blades. The connecting rods are mounted on the outer periphery of the rotating cylinder, the ring is mounted between the ends of multiple connecting rods, and the blades are arranged in annular array on the outer periphery of the ring.

[0016] Preferably, the limiting component includes a fixing post, a hemispherical protrusion, and an insulating sheet. The insulating sheet is attached to the top of the original current post, the fixing post is mounted on the insulating sheet, the hemispherical protrusion is attached to the outer periphery of the fixing post, and the hemispherical protrusion is spirally distributed and 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 housing, the Hall sensor is mounted at the bottom of the column and is located between the ends of the permanent magnets, and the connecting wire connects the two Hall sensors.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. This invention is applied to 3D printing equipment. During the preparation for printing, a contact sensor is used to detect the gap between the nozzle and the printing platform. To avoid edge warping, the printing platform needs to be heated to a certain temperature, causing heat exchange between the housing and the high-temperature printing platform. This results in an increase in the internal temperature of the housing. In this situation, when the sliding seat moves down with the housing and contacts the printing platform, the sliding seat moves upward relative to the housing. The sliding seat drives the limiting component to move upward through the primary current column. The limiting component drives the rotating component and the blade assembly to rotate, controlling the solenoid valve to be in the open state. This creates a negative pressure space inside the housing and the sliding seat, thereby significantly improving the heat insulation effect when the sliding seat contacts the printing platform, causing the internal temperature of the housing to rise slowly. In addition, when the sliding seat resets, the solenoid valve is in the open state, which can quickly draw low-temperature air back into the housing and the sliding seat, thereby significantly reducing the internal temperature of the housing. This effectively controls the ambient temperature of the permanent magnet, effectively preventing the permanent magnet from demagnetizing, and ensuring the gap detection accuracy of the 3D printing equipment.

[0020] 2. Through the setting of the rotating component, the blade component, and the limiting component, when the heat insulation plate at the bottom of the sliding seat contacts the printing platform, causing the sliding seat to move upward along the inner wall of the housing, the limiting component, in cooperation with the rotating component, simultaneously drives the rotating component and the blade component to rotate counterclockwise. As the internal space volume of the housing and the sliding seat decreases, the gas density increases. When the blade component rotates, a larger volume of air can be discharged, thereby significantly reducing the air pressure inside the housing and the sliding seat. When the relative displacement between the sliding seat and the housing is large, a negative pressure state can be formed, effectively improving the heat insulation effect when the sliding seat contacts the printing platform. Combined with the circular groove and heat insulation plate set on the sliding seat, the heat insulation effect when the sliding seat contacts the printing platform can be further improved, reducing the heat exchange efficiency between the sliding seat and the printing platform, which is beneficial to reducing the ambient temperature of the permanent magnet.

[0021] 3. Through the set rotating component and torsion spring, when the sliding seat moves upward relative to the housing, the rotating cylinder rotates counterclockwise. At this time, the torsion spring is in a stored state, which can make the heat insulation plate fit tightly with the printing platform, thereby ensuring the gap detection accuracy between the nozzle and the printing platform. When the sliding seat returns to its original position and moves downward relative to the sliding seat, the stored torsion spring can provide driving force for the rotating cylinder, which makes the fixed column and the rotating cylinder quickly return to the initial position. This helps to increase the speed at which air enters the housing and the sliding seat, so as to quickly reduce the internal temperature of the housing and the sliding seat, and keep the permanent magnet in a lower temperature environment. This not only extends the service life of the permanent magnet, but also ensures the gap detection accuracy. Attached Figure Description

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

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

[0024] Figure 3 This is a schematic diagram of the primary current column and limiting component of the present invention;

[0025] Figure 4 For the present invention Figure 2 Enlarged view of the structure at point A in the middle;

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

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

[0028] Figure 7 This is a schematic diagram of the structure of the rotating component and the limiting component of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the rotating component and the blade assembly of the present invention.

[0030] In the diagram: 1. Control and display instrument; 2. Energy storage power supply; 3. Data cable; 4. Housing; 41. Air vent; 42. Solenoid valve; 43. Cylindrical groove; 44. Limiting rod; 45. Limiting 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. Rotary blade assembly; 131. Connecting rod; 132. Ring; 133. Blade; 14. Slip ring; 15. Limiting assembly; 151. Fixed column; 152. Hemispherical protrusion; 153. Insulating sheet; 16. Sensor assembly; 161. Hall sensor; 162. Connecting wire; 163. Column. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1 to 8 The present invention provides a gap detection device, the technical solution of which is as follows.

[0033] Reference Figure 1 , Figure 2 and Figure 3A gap detection device includes a control display instrument 1, an energy storage power supply 2, a data cable 3, a housing 4, a sliding seat 5, a primary current column 6, a bonding seat 7, and permanent magnets 8. The control display instrument 1 is equipped with a display, control buttons, and a reset knob. A control host is installed inside the control display instrument 1, which is used to analyze and process the feedback gap data. The energy storage power supply 2 is installed on top of the control display instrument 1. The inner side of the housing 4 is used to install the various components of the contact sensor. The data cable 3 connects the housing 4 and the control display instrument 1, and its end extends to the inner side of the housing 4. A limiting groove is constructed on the inner circumference of the housing 4. The outer circumference of the sliding seat 5 is bonded to the inner circumference of the housing 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 bonding seats 7 are symmetrically installed on the inner circumference 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... The two permanent magnets 8 are mounted on two mounting seats 7 and there is a certain gap between the two ends of the two permanent magnets 8. The Hall sensor 161 can be accommodated by the gap. The assembly also includes a rotating component 9, a torsion spring 10, a built-in processor 11, an infrared sensor 12, a swivel assembly 13, a slip ring 14, a limiting assembly 15 and a sensor assembly 16. The rotating component 9 is limited and mounted on the inner top surface of the housing 4. A limiting bearing is provided on the inner top surface of the housing 4. The top of the rotating component 9 extends to the inner side of the limiting bearing, and there is a certain gap between the top of the rotating component 9 and the housing 4. The torsion spring 10 is installed between the housing 4 and the rotating component 9. The torsion spring 10 is located in the gap between the rotating component 9 and the housing 4. One end of the torsion spring 10 is inserted into the rotating component 9 and the other end is inserted into the housing 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 the reset of the rotating component 9, thereby accelerating the reset of the rotating component 9.The built-in processor 11 and infrared sensor 12 are both installed on the inner wall of the housing 4. The top of the housing 4 has multiple air holes 41, each containing a solenoid valve 42. When the infrared sensor 12 detects movement of the slip ring 14, the built-in processor 11 controls the solenoid valve 42 to open. The infrared sensor 12 is connected to the built-in processor 11, which is connected to the control display instrument 1 via a data cable 3. The infrared sensor 12 is located above the slip ring 14 and is used to monitor whether the slip ring 14 has shifted, thereby controlling the opening and closing of the solenoid valve 42 accordingly. Whether the slip ring 14 shifts upwards or downwards, the built-in processor 11 activates the solenoid valve 42 circuit to open the solenoid valve 42, allowing the internal space of the housing 4 and sliding seat 5 to communicate with the outside. This facilitates changing the air pressure inside the housing 4 and sliding seat 5, and can improve the heat insulation effect or reduce the temperature by adjusting the internal air pressure. The swivel assembly 13 is installed on the outer periphery of the rotating assembly 9, and the slip ring 14 slides against the inner periphery of the housing 4. The limiting assembly 15 is installed on the original side current column 6. At the top, the sensor assembly 16 is installed and connected to the housing 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 upward along the inner circumference of the housing 4 along with the slip ring 14. The limiting assembly 15 moves upward along with the sliding seat 5 through the primary side current column 6. When the limiting assembly 15 moves upward, it drives the rotating assembly to rotate the blade assembly 13 counterclockwise. When the blade assembly 13 rotates, it discharges the air inside the housing 4 and the sliding seat 5, creating a negative pressure inside the housing 4. When in the neutral state, this effectively improves the heat insulation effect between the sliding seat 5 and the housing 4, preventing heat exchange due to contact between the sliding seat 5 and the printing platform, which could cause the permanent magnet 8 to demagnetize due to excessively rapid heating inside the housing 4. When the sliding seat 5 resets, outside air is replenished to the housing 4 and the interior of the sliding seat 5. Compared to 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 resets, the low-temperature outside air is drawn back into the housing 4 and the sliding seat 5, effectively reducing the internal temperature of the housing 4 and the sliding seat 5.

[0034] Reference Figure 4In one embodiment of the present invention, a cylindrical groove 43 is formed on the inner side of the housing 4, and a limiting rod 44 penetrating the slip ring 14 is inserted into the cylindrical groove 43. A limiting seat 45 is screwed to the bottom of the limiting rod 44, and the limiting seat 45 is screwed to the housing 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 entirely in the limiting groove on the inner side of the housing 4, and then the limiting rod 44 can be... The top of the rod is inserted into the cylindrical groove 43. When the limiting rod 44 abuts against the cylindrical groove 43, the limiting seat 45 is screwed onto the housing 4. Then the limiting rod 44 is lowered and screwed onto the limiting seat 45 to fix it. At this time, the top of the limiting rod 44 is still in the cylindrical groove 43. Thus, the limiting rod 44 can remain stable under the combined action of the cylindrical groove 43 and the limiting seat 45, thereby ensuring the limiting effect on the slip ring 14 and facilitating the disassembly and assembly of the limiting rod 44 and the slip ring 14.

[0035] Reference Figure 3 As one embodiment of the present invention, specifically, the bottom of the sliding seat 5 is provided with a circular groove 51, and a heat insulation sheet 52 with its bottom surface 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 is in contact with the printing platform.

[0036] Reference Figure 5 and Figure 6 In one embodiment of the present invention, the fitting seat 7 specifically includes a support plate 71 and an insert 72. The insert 72 is inserted into the inner wall of the sliding seat 5, and the support plate 71 is fixed to the end of the insert 72. The support plate 71 is fitted with the permanent magnet 8, and the end of the support plate 71 is fitted with the inner wall of the sliding seat 5. When the insert 72 is inserted into the inner wall of the sliding seat 5, the stability between the support plate 71 and the insert 72 and the sliding seat 5 can be improved by the fit between the support plate 71 and the inner wall of 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 impact of heat exchange on the permanent magnet 8, and thus greatly reducing the phenomenon of demagnetization of the permanent magnet 8.

[0037] Reference Figure 2 and Figure 7 As one 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 a limiting bearing. The rotating cylinder 91 is rotatably connected to the housing 4 through the limiting bearing, and the rotating cylinder 91 and the housing 4 are coaxially arranged. The spiral groove 92 is formed on the inner circumference of the rotating cylinder 91.

[0038] Reference Figure 8In one embodiment of the present invention, the rotor assembly 13 specifically 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 arranged in a ring 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 via the connecting rod 131. (Refer to...) Figure 8 The direction of the blade 133 is such that when the blade 133 rotates counterclockwise, it can guide the air inside the housing 4 and the sliding seat 5 to flow to the outside of the housing 4, and when the blade 133 rotates clockwise, it can guide the outside air to flow into the housing 4 and the sliding seat 5. Thus, when the sliding seat 5 is reset, it can replenish the low-temperature air into the housing 4 and the sliding seat 5 in time, so as to reduce the overall temperature inside the housing 4.

[0039] Reference Figure 3 and Figure 7 In one embodiment of the present invention, the limiting component 15 specifically includes a fixing post 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, and the fixing post 151 is mounted on the insulating sheet 153. The fixing post 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 post 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 post 151, and the hemispherical protrusion 152 is spiral. The hemispherical protrusions 152 and the spiral grooves 92 are matched in a circular distribution. When the fixed column 151 moves upward, since the fixed column 151 only produces vertical displacement, the position of the hemispherical protrusions 152 in the spiral grooves 92 is constantly changing. As a result, the rotating cylinder 91 rotates counterclockwise under the combined action of the hemispherical protrusions 152 and the spiral grooves 92. The rotating cylinder 91 drives the blade assembly 13 to rotate together, and discharges the air in the housing 4 and the sliding seat 5 through the air hole 41, reducing the air pressure inside the housing 4 and the sliding seat 5, thereby reducing the heating rate inside the housing 4 and the sliding seat 5.

[0040] Reference Figure 5 As one embodiment of the present invention, specifically, the sensor assembly 16 includes a Hall sensor 161, a connecting line 162, and a column 163. The column 163 is connected to the housing 4. The Hall sensor 161 is installed at the bottom of the column 163 and is located between the ends of the permanent magnet 8. The connecting line 162 is connected between the two Hall sensors 161. When the permanent magnet 8 moves relative to the housing 4 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 applied to a 3D printing equipment, the control display instrument 1 is installed in a suitable position on the printing equipment, and the housing 4 is mounted next to the nozzle via a bracket, with the bottom of the housing 4 higher than the bottom of the nozzle. As the nozzle height decreases, the housing 4 and the sliding seat 5 decrease together with the nozzle. When the nozzle descends to a certain height, the heat insulation plate 52 at the bottom of the sliding seat 5 first contacts the printing platform. As the nozzle continues to move downward, the sliding seat 5 displaces upward relative to the housing 4. At this time, the limiting component 15 moves upward with the sliding seat 5 through the primary side current column 6, and thus the limiting component 15 displaces upward relative to the rotating component 9. The limiting component 15 drives the rotating component 9 and the blade assembly 13 to rotate counterclockwise. The infrared sensor 12 detects the sliding... When the ring 14 moves inside the housing 4, the built-in processor 11 controls the circuit of the solenoid valve 42 to be turned on. The vane assembly 13 discharges the air inside the housing 4 and the sliding seat 5 through the air hole 41. When the ring 14 stops moving, the power supply of the solenoid valve 42 is disconnected in time and the solenoid valve 42 is closed. When the nozzle performs the printing operation and gradually moves away from the printing platform, as the nozzle rises, the heat insulation plate 52 at the bottom of the sliding seat 5 gradually separates from the printing platform. Under the gravity of the sliding seat 5 and the original edge current column 6, the sliding seat 5 slowly moves down to reset. At this time, the rotating assembly and the vane assembly 13 rotate clockwise. Outside air enters the housing 4 and the sliding seat 5 through the air hole 41, thereby reducing the temperature inside the housing 4 and the sliding seat 5, so that the ambient temperature of the permanent magnet 8 can be reduced.

[0042] Specifically, when the nozzle continues to move downward after the heat insulation plate 52 contacts the printing platform, the sliding seat 5 moves upward relative to the housing 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 blade to rotate counterclockwise through the connecting rod 131 and the ring 132. Since the slip ring 14 is in a moving state, the built-in processor 11 connects the circuit of the solenoid valve 42. The counterclockwise rotation of the blade discharges the air inside the housing 4 and the sliding seat 5 through the air hole 41, thereby reducing the air pressure inside the housing 4 and the sliding seat 5. When the sliding seat 5 contacts the printing platform, by reducing the air pressure inside the housing 4 and the sliding seat 5, the heat exchange rate between the sliding seat 5 and the printing platform can be reduced, thereby avoiding the housing 4 and the sliding seat 5 from heating up too quickly. This ensures that the temperature inside the housing 4 and the sliding seat 5 does not exceed the maximum working temperature of the permanent magnet 8, thereby ensuring the magnetism of the permanent magnet 8, extending the service life of the permanent magnet 8, and ensuring the detection accuracy of the gap between the nozzle and the printing platform.

[0043] As the heat insulation plate 52 gradually separates from the printing platform as the nozzle moves upward, the sliding seat 5 moves downward relative to the housing 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 combined action of the hemispherical protrusion 152 and the spiral groove 92, the rotating cylinder 91 and the blade rotate clockwise. At this time, under the action of the blade, the outside air is drawn into the housing 4 and the sliding seat 5 through the air hole 41. The outside air temperature is lower than the air temperature inside the housing 4 and the sliding seat 5. Therefore, the supplemented outside air will neutralize with the original air, thereby significantly reducing the air temperature inside the housing 4 and the sliding seat 5, cooling the permanent magnet 8 in time, further ensuring the magnetism of the permanent magnet 8, extending the service life of the permanent magnet 8, and fully ensuring the detection accuracy of the gap between the nozzle and the printing platform.

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

Claims

1. A gap detection device, comprising a control and display instrument, a power storage power supply, a data cable, a housing, a sliding seat, a primary current column, a bonding seat, and a permanent magnet, characterized in that: It also includes a rotating assembly, a torsion spring, a built-in processor, an infrared sensor, a swivel assembly, a slip ring, a limiting assembly, and a sensor assembly. The rotating assembly is limited and installed on the top surface of the inner side of the housing. The torsion spring is installed between the housing and the rotating assembly. The built-in processor and the infrared sensor are both installed on the inner wall of the housing. The swivel assembly is installed on the outer periphery of the rotating assembly. The slip ring slides against the inner periphery of the housing. The limiting assembly is installed on the top of the primary side current column. The sensor assembly is installed and connected to the housing. When the bottom of the sliding seat contacts the substrate, it moves upward along the inner periphery of the housing along with the slip ring. The limiting assembly moves upward along with the sliding seat through the primary side current column. When the limiting assembly moves upward, it drives the rotating assembly to rotate the swivel assembly counterclockwise. When the swivel assembly rotates, it discharges the air inside the housing and the sliding seat, creating a negative pressure inside the housing. When the sliding seat resets, external air is replenished into the housing and the sliding seat. The inner side of the housing has a cylindrical groove, and a limiting rod that passes through the slip ring is inserted in the cylindrical groove. The bottom of the limiting rod is screwed to a limiting seat, and the limiting seat is screwed to the housing. The depth of the cylindrical groove is greater than the height of the limiting seat. The fitting seat includes a support plate and an insert block. The insert block is inserted into the inner wall of the sliding seat, and the support plate is fixed to the end of the insert block. The support plate is also fitted and installed with the permanent magnet. The rotating assembly includes a rotating cylinder and a spiral groove. The rotating cylinder is rotatably connected to the housing and is coaxially arranged with the housing. The spiral groove is formed on the inner circumference of the rotating cylinder. The limiting component includes a fixed post, a hemispherical protrusion, and an insulating sheet. The insulating sheet is attached to the top of the original current post, the fixed post is mounted on the insulating sheet, and the hemispherical protrusion is attached to the outer periphery of the fixed post. The hemispherical protrusion is distributed in a spiral shape and is adapted to the spiral groove.

2. The gap detection device according to claim 1, characterized in that: The top of the housing has multiple air holes, and each air hole is equipped with a solenoid valve. When the infrared sensor detects the movement of the slip ring, the built-in processor controls the solenoid valve to be in the open state.

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

4. The gap detection device according to claim 1, characterized in that: The rotor assembly includes connecting rods, a ring, and blades. The connecting rods are mounted on the outer periphery of the rotating cylinder, the ring is mounted between the ends of multiple connecting rods, and the blades are arranged in a ring array on the outer periphery of the ring.

5. The gap detection device according to claim 1, characterized in that: The sensor assembly includes a Hall sensor, a connecting wire, and a column. The column is connected to the housing, the Hall sensor is mounted at the bottom of the column and is located between the ends of the permanent magnets, and the connecting wire connects the two Hall sensors.

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