Liquid level measuring device and vacuum damping machine

Abstract

The embodiment of the invention provides a liquid level measuring device which comprises a shell arranged outside a liquid tank, and scale marks are arranged on the outer wall of the shell; the fixing cylinder is arranged above the shell, and the fixing cylinder penetrates through the receding hole and extends into the shell; the driving column is arranged in the fixed cylinder, and a spiral groove is formed in the circumferential surface of the driving column; the buoyancy block is arranged on the circumferential surface of the fixed cylinder in a sleeving mode, and a driving protrusion is arranged on the buoyancy block and inserted into the spiral groove; the first end of the indicating rod is located in the shell, and the second end of the indicating rod penetrates through the shell and extends out of the shell; the transmission mechanism is arranged between the driving column and the indicating rod; and the pointer is arranged at the second end, and the end part of the pointer points to the scale marks. The liquid level measuring device can replace a communicating vessel structure in the prior art to measure the liquid level, liquid in the liquid box can be prevented from leaking when the liquid level measuring device is damaged, and the reliability of the device is improved. The invention further provides the vacuum damping machine.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level detection, and in particular to a liquid level measuring device and a vacuum rehumidification machine. Background Art

[0002] Vacuum rehumidification machines are widely used in tobacco production lines in the cigarette industry. They continuously and automatically rehumidify tobacco leaves through vacuum conditioning, raising their temperature and moisture content to enhance their flexibility and resistance to breakage, improving the flavor of the finished tobacco, and facilitating the absorption of moisture, temperature, and liquid. They also remove green odors from the tobacco leaves and, to a certain extent, eliminate insect eggs. Currently, the liquid level in the liquid tank of a vacuum rehumidification machine is typically displayed and measured using an external, connected level measurement device.

[0003] However, existing liquid level measurement devices in vacuum rehumidifiers are typically mounted outside the liquid tank for easy operator observation. This makes them susceptible to damage from external impacts. Because these devices display and measure the liquid level inside the tank using the communicating vessel principle, damage and leakage can easily lead to leakage of the liquid inside the tank, resulting in poor reliability. Summary of the Invention

[0004] The present invention aims to address the current technical problem of liquid leakage from the liquid tank caused by damage to the liquid level measuring device in vacuum rehumidification machines. The present invention provides a liquid level measuring device and vacuum rehumidification machine that utilize a mechanical transmission structure to transfer the kinetic energy of a buoyancy block moving with the liquid to a pointer. This replaces the existing communicating vessel structure for measuring liquid level. Furthermore, damage to the liquid level measuring device prevents liquid leakage from the liquid tank, improving the reliability of the device.

[0005] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention are described in further detail below.

[0006] An embodiment of the present invention provides a liquid level measuring device for detecting the liquid level in a liquid tank. The liquid level measuring device includes:

[0007] a shell, arranged outside the liquid tank;

[0008] The fixed cylinder is provided above the shell, the inner cavity of the fixed cylinder is connected to the inner cavity of the shell, the bottom of the liquid tank is provided with a clearance hole, the fixed cylinder extends into the shell through the clearance hole, and the fixed cylinder is provided with two positioning grooves arranged at intervals along the circumference of the fixed cylinder, each positioning groove extends along a first direction, and the first direction is the axial direction of the fixed cylinder;

[0009] A driving column is arranged in the fixed cylinder, and the driving column can rotate around its own axis in the fixed cylinder, and a spiral groove is provided on the circumferential surface of the driving column;

[0010] The buoyancy block is provided with a circular hole, which is sleeved on the circumferential surface of the fixed cylinder. Two positioning blocks are provided on the inner wall of the buoyancy block, and the two positioning blocks are respectively inserted into the two positioning grooves. One of the positioning blocks is provided with a driving protrusion, which is inserted into the spiral groove.

[0011] an indicator rod extending in a second direction perpendicular to the first direction, the indicator rod having a first end and a second end, the first end being located within the housing, the second end passing through the housing and extending outside the housing, and the indicator rod being rotatable about its own axis;

[0012] The transmission mechanism is provided between the driving column and the indicator rod. When the driving column rotates, the driving column can transmit power to the indicator rod through the transmission mechanism to rotate the indicator rod.

[0013] The pointer is arranged at the second end. A scale line is arranged on the outer wall of the shell, and the end of the pointer points to the scale line.

[0014] According to another specific embodiment of the present invention, the transmission mechanism includes:

[0015] A first installation shaft is provided in the housing, the first installation shaft extends along a first direction, and the first installation shaft is capable of rotating around its own axis;

[0016] A first transmission wheel is located in the housing, the first transmission wheel is directly or indirectly connected to the driving column, and the axis of the first transmission wheel extends along a first direction;

[0017] a second transmission wheel, disposed on the top of the first mounting shaft, the second transmission wheel being in contact with the first transmission wheel;

[0018] a third transmission wheel, disposed at the bottom of the first mounting shaft;

[0019] The fourth transmission wheel is connected to the first end of the indicator rod, and the first transmission wheel is in contact with the third transmission wheel.

[0020] According to another specific embodiment of the present invention, the first transmission wheel and the second transmission wheel are both truncated cone-shaped, the side surface of the first transmission wheel is in contact with the side surface of the second transmission wheel, and a cavity is provided inside the driving column that passes through both ends of the driving column in the first direction. The liquid level measuring device further includes:

[0021] An adjusting rod is disposed in the cavity of the driving column, and the bottom of the adjusting rod is connected to the first transmission wheel;

[0022] The pressing mechanism contacts the first installation shaft and can apply pressure to the first installation shaft toward the first transmission wheel.

[0023] According to another specific embodiment of the present invention, the first transmission wheel and the second transmission wheel are both made of rubber.

[0024] According to another specific embodiment of the present invention, a synchronization column is connected above the first transmission wheel, a synchronization groove is provided at the bottom of the driving column, the synchronization column is inserted into the synchronization groove, the cross-sections of the synchronization column and the synchronization groove are polygons with matching shapes, a threaded hole is provided on the upper surface of the synchronization column, and an external thread is provided on the bottom circumferential surface of the adjusting rod, the external thread is threadedly connected to the threaded hole, and the adjusting rod can rotate around its own axis.

[0025] According to another specific embodiment of the present invention, the indicator rod includes a cylindrical portion and a prismatic portion, the prismatic portion is close to the first end, and the cylindrical portion is close to the second end. A second mounting shaft is provided on the fourth transmission wheel, and an end surface of the second mounting shaft is provided with an adaptation groove. The prismatic portion is inserted into the adaptation groove, and the cross-section of the prismatic portion and the cross-section of the adaptation groove are polygonal shapes that match each other.

[0026] According to another specific embodiment of the present invention, the tightening mechanism includes:

[0027] A track seat is slidably disposed within the housing, the track seat being capable of reciprocatingly sliding along a second direction, a first mounting hole extending along the first direction being provided on a top of the track seat, a second mounting hole extending along the second direction being provided on a side wall of the track seat, the first mounting shaft being inserted into the first mounting hole, the cylindrical portion of the indicator rod being inserted into the second mounting hole, and the side wall of the track seat being in contact with an end surface of the second mounting shaft;

[0028] The compression spring is arranged between the rail seat and the inner wall of the shell along the second direction, and is used for applying a force to the rail seat toward the first transmission wheel.

[0029] According to another specific embodiment of the present invention, the third transmission wheel and the fourth transmission wheel are both bevel gears, and the third transmission wheel is meshed with the fourth transmission wheel.

[0030] According to another specific embodiment of the present invention, a first annular limiting groove is provided on the inner wall of the fixed cylinder, and a first limiting protrusion is provided on the outer wall of the driving column. The first limiting protrusion is arranged in the first limiting groove, and is used to limit the driving column from sliding in the first direction relative to the fixed cylinder; a second annular limiting groove is provided on the inner wall of the driving column, and a second limiting protrusion is provided on the outer wall of the adjusting rod. The second limiting protrusion is arranged in the second limiting groove, and is used to limit the adjusting rod from sliding in the first direction relative to the driving column.

[0031] According to another specific embodiment of the present invention, a protective base is provided at the bottom of the liquid tank, the interior of the protective base has a cavity, the shell portion is provided in the cavity of the protective base, and the side wall of the shell marked with scale lines extends to the outside of the protective base.

[0032] An embodiment of the present invention further discloses a vacuum rehumidification machine, comprising any of the aforementioned liquid level measuring devices.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The buoyancy block in the present invention can float above the liquid in the liquid tank. At the same time, since the positioning block on the buoyancy block is inserted into the positioning groove on the fixed cylinder, the buoyancy block cannot rotate under the restriction of the positioning groove and can only move up and down along the first direction. When the buoyancy block moves up and down with the change of the liquid level, the driving protrusion on the buoyancy block will exert a force on the spiral groove on the driving column, causing the driving column to rotate. Then the driving column drives the indicator rod to rotate through the transmission mechanism, so that the pointer at the end of the indicator rod points to the scale corresponding to the current liquid level, so that the operator can read the liquid level. The present invention uses a mechanical transmission mechanism to transfer the kinetic energy of the buoyancy block moving with the liquid to the pointer, which can replace the communicating vessel structure in the prior art to measure the liquid level, so that the inner cavity of the shell and the inner cavity of the liquid tank are not connected to each other, thereby avoiding liquid leakage in the liquid tank when the shell is damaged, and improving the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram showing the appearance of a liquid level measuring device provided by one embodiment of the present invention is shown;

[0036] Figure 2 A cross-sectional perspective view of a liquid level measuring device according to an embodiment of the present invention is shown. Figure 1 ;

[0037] Figure 3 A cross-sectional perspective view of a liquid level measuring device according to an embodiment of the present invention is shown. Figure 2 ;

[0038] Figure 4 Show Figure 2 A partial enlarged view of part A;

[0039] Figure 5 Show Figure 2 A partial enlarged view of part B;

[0040] Figure 6 Schematic diagram showing the disassembled structure of part of the structure of the liquid level measuring device provided by one embodiment of the present invention Figure 1 ;

[0041] Figure 7 Schematic diagram showing the disassembled structure of part of the structure of the liquid level measuring device provided by one embodiment of the present invention Figure 2 ;

[0042] Figure 8 A cross-sectional view of a liquid level measuring device provided by one embodiment of the present invention is shown;

[0043] Figure 9 Show Figure 8 A partial enlarged view of part C in the middle;

[0044] Figure 10 Show Figure 8 A partial enlarged view of part D in the middle;

[0045] Figure 11 Show Figure 8 A partial enlarged view of part E in the middle.

[0046] Reference numerals:

[0047] 1. Housing, 11. Scale line, 2. Fixed cylinder, 21. Positioning groove, 22. First limiting groove, 3. Drive column, 31. Spiral groove, 32. First limiting protrusion, 33. Second limiting groove, 34. Synchronizing groove, 4. Adjusting rod, 41. Second limiting protrusion, 42. External thread, 5. Transmission mechanism, 51. First transmission wheel, 52. Synchronizing column, 521. Threaded hole, 53. Second transmission wheel, 54. First mounting shaft, 55. Third transmission wheel, 56. Fourth transmission wheel, 57. Second mounting shaft, 571. Adaptive groove, 6. Indicator rod, 61. Cylindrical portion, 62. Prismatic portion, 7. Pointer, 8. Tightening mechanism, 81. Track seat, 811. First mounting hole, 812. Second mounting hole, 82. Compression spring, 9. Buoyancy block, 91. Positioning block, 92. Drive protrusion, 100. Liquid tank, 200. Protective base. DETAILED DESCRIPTION

[0048] The following is an explanation of the embodiments of the present invention by specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this embodiment. On the contrary, the purpose of introducing the invention in conjunction with the embodiment is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0049] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0050] The terms "first," "second," "third," "fourth," etc. are only used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0051] In the description of this embodiment, it should be noted that the terms "left", "right", "front", "rear", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0052] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0053] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention are described in further detail below.

[0054] refer to Figure 1 、 Figure 6 、 Figure 8 and Figure 10 The embodiment of the present invention provides a liquid level measuring device for detecting the liquid level height in a liquid tank 100, the liquid level measuring device comprising:

[0055] The housing 1 is provided outside the liquid tank 100;

[0056] The fixed cylinder 2 is arranged above the shell 1. The inner cavity of the fixed cylinder 2 is connected to the inner cavity of the shell 1. A clearance hole is provided at the bottom of the liquid tank 100. The fixed cylinder 2 extends into the shell 1 through the clearance hole. The fixed cylinder 2 is provided with two positioning grooves 21 arranged at intervals along the circumference of the fixed cylinder 2. Each positioning groove 21 is arranged along the first direction (such as Figure 8 The first direction is the axial direction of the fixed cylinder 2;

[0057] The driving column 3 is disposed in the fixed cylinder 2. The driving column 3 can rotate around its own axis in the fixed cylinder 2. A spiral groove 31 is provided on the circumferential surface of the driving column 3.

[0058] The buoyancy block 9 is provided with a circular hole, which is sleeved on the circumferential surface of the fixed cylinder 2. The density of the buoyancy block 9 is less than the density of the liquid in the liquid tank 100, and it can float on the liquid surface. Two positioning blocks 91 are provided on the inner wall of the buoyancy block 9. The two positioning blocks 91 are respectively inserted into the two positioning grooves 21. One of the positioning blocks 91 is provided with a driving protrusion 92, which is inserted into the spiral groove 31.

[0059] Indicator rod 6, along the second direction (such as Figure 8 The second direction is perpendicular to the first direction. The indicator rod 6 has a first end and a second end. The first end is located in the housing 1, and the second end passes through the housing 1 and extends to the outside of the housing 1. The indicator rod 6 can rotate around its own axis.

[0060] The transmission mechanism 5 is provided between the driving column 3 and the indicator rod 6. When the driving column 3 rotates, the driving column 3 can transmit power to the indicator rod 6 through the transmission mechanism 5, so that the indicator rod 6 rotates;

[0061] The pointer 7 is provided at the second end. A scale line 11 is provided on the outer wall of the housing 1 , and the end of the pointer 7 points to the scale line 11 .

[0062] The buoyancy block 9 of the present invention can float above the liquid in the liquid tank 100. At the same time, since the positioning block 91 on the buoyancy block 9 is inserted into the positioning groove 21 on the fixing cylinder 2, the buoyancy block 9 cannot rotate under the restriction of the positioning groove 21 and can only move up and down along the first direction. Specifically, when the liquid is at the lowest level, the position of the buoyancy block 9 is as follows: Figure 2 As shown, the position of the buoyancy block 9 when the liquid is at the highest level is as follows: Figure 3 As shown, when the buoyancy block 9 moves up and down with the change in the liquid level, the driving protrusion 92 on the buoyancy block 9 applies a force to the spiral groove 31 on the driving column 3, causing the driving column 3 to rotate. The driving column 3 then drives the indicator rod 6 to rotate through the transmission mechanism 5, so that the pointer 7 at the end of the indicator rod 6 points to the scale corresponding to the current liquid level, allowing the operator to read the liquid level. The present invention uses a mechanical transmission mechanism 5 to transfer the kinetic energy of the buoyancy block 9 moving with the liquid to the pointer 7. It can replace the communicating vessel structure in the prior art to measure the liquid level, so that the inner cavity of the shell 1 and the inner cavity of the liquid tank 100 are not connected to each other, thereby preventing liquid leakage in the liquid tank 100 when the shell 1 is damaged, thereby improving the reliability of the device.

[0063] Furthermore, a seal is provided between the outer circumferential surface of the lower end of the fixing cylinder 2 and the inner wall of the clearance hole of the liquid tank 100, and a seal is provided between the outer circumferential surface of the lower portion of the driving column 3 and the inner circumferential surface of the lower end of the fixing cylinder 2. The provision of the seal further prevents the liquid in the liquid tank 100 from flowing into the housing 1.

[0064] For further reference, Figure 5 、 Figure 7 and Figure 11The transmission mechanism 5 includes: a first mounting shaft 54, a first transmission wheel 51, a second transmission wheel 53, a third transmission wheel 55 and a fourth transmission wheel 56; wherein, the first mounting shaft 54 ​​is arranged in the housing 1, the first mounting shaft 54 ​​extends along the first direction, and the first mounting shaft 54 ​​can rotate around its own axis; the first transmission wheel 51 is located in the housing 1, the first transmission wheel 51 is directly or indirectly connected to the driving column 3, and the axis of the first transmission wheel 51 extends along the first direction; the second transmission wheel 53 is arranged at the top of the first mounting shaft 54, and the second transmission wheel 53 is in contact with the first transmission wheel 51; the third transmission wheel 55 is arranged at the bottom of the first mounting shaft 54; the fourth transmission wheel 56 is connected to the first end of the indicator rod 6, and the first transmission wheel 51 is in contact with the third transmission wheel 55.

[0065] When the driving column 3 rotates driven by the buoyancy block 9, the first transmission wheel 51 rotates with the driving column 3. At the same time, the first transmission wheel 51 drives the second transmission wheel 53 to rotate through contact with the second transmission wheel 53. The second transmission wheel 53 transmits power to the third transmission wheel 55 through the first mounting shaft 54, causing the third transmission wheel 55 to rotate. The third transmission wheel 55 then drives the fourth transmission wheel 56 and the indicator rod 6 to rotate to transmit power.

[0066] For further reference, Figure 5 and Figure 11 The first transmission wheel 51 and the second transmission wheel 53 are both truncated cone-shaped. The side of the first transmission wheel 51 fits into the side of the second transmission wheel 53. The first transmission wheel 51 drives the second transmission wheel 53 to rotate through friction. The interior of the driving column 3 is provided with a cavity that passes through both ends of the driving column 3 along the first direction. The liquid level measuring device also includes: an adjusting rod 4 and a tightening mechanism 8. The adjusting rod 4 is provided in the cavity of the driving column 3. The bottom of the adjusting rod 4 is connected to the first transmission wheel 51. The adjusting rod 4 is used to adjust the position of the first transmission wheel 51 along the first direction; the tightening mechanism 8 is in contact with the first mounting shaft 54, and the tightening mechanism 8 can apply pressure to the first mounting shaft 54 ​​toward the first transmission wheel 51.

[0067] By providing an adjustment rod 4, this embodiment allows for free adjustment of the maximum volume indicated by the pointer 7, thereby enabling the liquid level measuring device to adapt to different liquid level display and limit requirements, thereby improving the flexibility and adaptability of the measuring device. It should be noted that in this embodiment, the liquid level inside the liquid tank 100 indicated by the pointer 7 is a percentage of the current liquid level relative to the maximum set liquid level. Since the scale value indicated by the pointer 7 is directly proportional to the liquid level, the scale value indicated by the pointer 7 can be used to measure the liquid level inside the liquid tank 100. When it is necessary to make the pointer 7 indicate the maximum position of the scale line 11 and match the volume of the liquid inside the liquid tank 100, the operator can manipulate the adjusting rod 4 to make the adjusting rod 4 drive the first transmission wheel 51 to move up and down along the first direction. When the first transmission wheel 51 moves up and down, the second transmission wheel 53 is always pressed against the first transmission wheel 51 under the pushing action of the tightening mechanism 8. Therefore, the contact position between the first transmission wheel 51 and the second transmission wheel 53 is changed, thereby changing the transmission ratio between the first transmission wheel 51 and the second transmission wheel 53, that is, changing the liquid volume in the liquid tank 100 corresponding to the scale when the pointer 7 indicates the maximum scale of the scale line 11. Therefore, the liquid level measuring device can be adapted to liquid tanks of different volumes, thereby improving the flexibility and adaptability of the measuring device.

[0068] Optionally, the first transmission wheel 51 and the second transmission wheel 53 are both made of rubber. By setting the material of the first transmission wheel 51 and the second transmission wheel 53 to rubber, the friction between the first transmission wheel 51 and the second transmission wheel 53 can be increased.

[0069] For further reference, Figure 4 and Figure 11 A synchronization post 52 is connected above the first transmission wheel 51. A synchronization groove 34 is provided at the bottom of the drive column 3. The synchronization post 52 is inserted into the synchronization groove 34. The cross-sections of the synchronization post 52 and the synchronization groove 34 are polygonal and match each other. A threaded hole 521 is provided on the upper surface of the synchronization post 52. The bottom circumferential surface of the adjustment rod 4 is provided with an external thread 42, which is threadedly connected to the threaded hole 521. The adjustment rod 4 cannot move up and down relative to the drive column 3, but the adjustment rod 4 can rotate about its own axis. For example, the cross-sections of the synchronization post 52 and the synchronization groove 34 are both regular hexagons. When the drive column 3 rotates, the synchronization groove 34 can apply torque to the synchronization post 52, causing the first transmission wheel 51 to rotate along with the drive column 3. In this embodiment, the adjusting rod 4 is threadedly connected to the synchronization column 52. When it is necessary to adjust the position of the first transmission wheel 51 along the first direction, the operator holds the driving column 3 so that it cannot rotate, and rotates the adjusting rod 4 at the same time. The synchronization column 52 and the first transmission wheel 51 can move up and down along the first direction under the action of the thread, thereby adjusting the position of the first transmission wheel 51 along the first direction.

[0070] For further reference, Figure 7 and Figure 11 The indicator rod 6 includes a cylindrical portion 61 and a prismatic portion 62. The prismatic portion 62 is located near the first end, and the cylindrical portion 61 is located near the second end. A second mounting shaft 57 is fixedly connected to the fourth transmission wheel 56. An adapting groove 571 is defined on the end surface of the second mounting shaft 57. The prismatic portion 62 is inserted into the adapting groove 571. The cross-section of the prismatic portion 62 and the cross-section of the adapting groove 571 are polygonal and conform to each other. For example, the cross-sections of the prismatic portion 62 and the adapting groove 571 are both regular hexagons. When the fourth transmission wheel 56 and the second mounting shaft 57 rotate, the adapting groove 571 applies torque to the prismatic portion 62, causing the indicator rod 6 to rotate along with the fourth transmission wheel 56.

[0071] For further reference, Figure 5 、 Figure 7 and Figure 11 The tightening mechanism 8 includes a track seat 81 and a compression spring 82. The track seat 81 is slidably arranged in the housing 1, and the track seat 81 can slide back and forth along the second direction. The top of the track seat 81 is provided with a first mounting hole 811 extending along the first direction, and the side wall of the track seat 81 is provided with a second mounting hole 812 extending along the second direction. The first mounting shaft 54 ​​is inserted into the first mounting hole 811, and the cylindrical portion 61 of the indicator rod 6 is inserted into the second mounting hole 812. The side wall of the track seat 81 is in contact with the end surface of the second mounting shaft 57; the compression spring 82 is arranged between the track seat 81 and the inner wall of the housing 1 along the second direction. The compression spring 82 is used to apply a force toward the first transmission wheel 51 to the track seat 81, so that the track seat 81 drives the second transmission wheel 53 to move in the direction close to the first transmission wheel 51, so that the side wall of the second transmission wheel 53 can be tightly pressed on the side wall of the first transmission wheel 51, thereby realizing friction transmission.

[0072] Optionally, the third transmission wheel 55 and the fourth transmission wheel 56 are both bevel gears, and the third transmission wheel 55 is meshed with the fourth transmission wheel 56 .

[0073] For further reference, Figure 9 A first annular limiting groove 22 is provided on the inner wall of the upper end of the fixed cylinder 2, and a first limiting protrusion 32 is provided on the outer wall of the upper end of the driving column 3. The first limiting protrusion 32 is arranged in the first limiting groove 22, and is used to limit the driving column 3 from sliding along the first direction relative to the fixed cylinder 2; an annular second limiting groove 33 is provided on the inner wall of the upper end of the driving column 3, and a second limiting protrusion 41 is provided on the outer wall of the upper end of the adjusting rod 4. The second limiting protrusion 41 is arranged in the second limiting groove 33, and is used to limit the adjusting rod 4 from sliding along the first direction relative to the driving column 3.

[0074] For further reference, Figure 8The bottom of the liquid tank 100 is provided with a protective base 200. The protective base 200 has a cavity inside, and the housing 1 is partially disposed within the cavity of the protective base 200. The protective base 200 protects the housing 1 from damage. The side wall of the housing 1 marked with scale lines 11 extends outside the protective base 200 to facilitate the operator to observe the measured value.

[0075] An embodiment of the present invention further discloses a vacuum rehumidification machine, comprising any of the aforementioned liquid level measuring devices.

[0076] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A liquid level measuring device for detecting the liquid level in a liquid tank, characterized in that: The liquid level measuring device comprises: A shell, arranged outside the liquid tank; A fixed cylinder is arranged above the shell, the inner cavity of the fixed cylinder is communicated with the inner cavity of the shell, a clearance hole is arranged at the bottom of the liquid box, the fixed cylinder extends into the shell through the clearance hole, and the fixed cylinder is provided with two positioning grooves arranged at intervals along the circumference of the fixed cylinder, each of the positioning grooves extends along a first direction, and the first direction is the axial direction of the fixed cylinder; A driving column is arranged in the fixing cylinder, the driving column can rotate around its own axis in the fixing cylinder, and a spiral groove is arranged on the circumferential surface of the driving column; A buoyancy block, on which a circular hole is provided, the circular hole is sleeved on the circumferential surface of the fixing cylinder, two positioning blocks are provided on the inner wall of the buoyancy block, the two positioning blocks are respectively inserted into the two positioning grooves, one of the positioning blocks is provided with a driving protrusion, and the driving protrusion is inserted into the spiral groove; an indicating rod extending in a second direction, the second direction being perpendicular to the first direction, the indicating rod having a first end and a second end, the first end being located in the housing, the second end passing through the housing and extending to the outside of the housing, and the indicating rod being able to rotate around its own axis; a transmission mechanism, disposed between the driving column and the indicating rod, and when the driving column rotates, the driving column can transmit power to the indicating rod through the transmission mechanism, so that the indicating rod rotates; A pointer is arranged at the second end, and a scale line is arranged on the outer wall of the shell, and the end of the pointer points to the scale line.

2. The liquid level measuring device according to claim 1, characterized in that: The transmission mechanism comprises: A first installation shaft is disposed in the housing, the first installation shaft extends along the first direction, and the first installation shaft can rotate around its own axis; A first transmission wheel is located in the housing, the first transmission wheel is directly or indirectly connected to the driving column, and the axis of the first transmission wheel extends along the first direction; a second transmission wheel, disposed on the top of the first mounting shaft, the second transmission wheel being in contact with the first transmission wheel; a third transmission wheel, disposed at the bottom of the first mounting shaft; A fourth transmission wheel is connected to the first end of the indicator rod, and the first transmission wheel is in contact with the third transmission wheel.

3. The liquid level measuring device according to claim 2, characterized in that: The first transmission wheel and the second transmission wheel are both truncated cone-shaped, the side surface of the first transmission wheel is in contact with the side surface of the second transmission wheel, the interior of the driving column is provided with a cavity that passes through both ends of the driving column along the first direction, and the liquid level measuring device further includes: An adjusting rod, disposed in the cavity of the driving column, wherein the bottom of the adjusting rod is connected to the first transmission wheel; The pressing mechanism is in contact with the first installation shaft, and the pressing mechanism can apply pressure to the first installation shaft toward the first transmission wheel.

4. The liquid level measuring device according to claim 3, characterized in that: The first transmission wheel and the second transmission wheel are both made of rubber.

5. The liquid level measuring device according to claim 3, characterized in that: A synchronization column is connected above the first transmission wheel, a synchronization groove is provided at the bottom of the driving column, the synchronization column is inserted into the synchronization groove, the cross-sections of the synchronization column and the synchronization groove are polygons with matching shapes, a threaded hole is provided on the upper surface of the synchronization column, an external thread is provided on the bottom circumferential surface of the adjusting rod, the external thread is threadedly connected to the threaded hole, and the adjusting rod can rotate around its own axis.

6. The liquid level measuring device according to claim 5, characterized in that: The indicating rod includes a cylindrical portion and a prismatic portion, the prismatic portion is close to the first end, and the cylindrical portion is close to the second end. A second mounting shaft is provided on the fourth transmission wheel, and an adaption groove is provided on the end surface of the second mounting shaft. The prismatic portion is inserted into the adaption groove, and the cross-section of the prismatic portion and the cross-section of the adaption groove are polygonal shapes that match each other.

7. The liquid level measuring device according to claim 6, characterized in that: The tightening mechanism comprises: A track seat is slidably disposed in the housing, the track seat can reciprocate along the second direction, a first mounting hole extending along the first direction is provided on the top of the track seat, a second mounting hole extending along the second direction is provided on the side wall of the track seat, the first mounting shaft is inserted into the first mounting hole, the cylindrical portion of the indicator rod is inserted into the second mounting hole, and the side wall of the track seat is in contact with the end surface of the second mounting shaft; A compression spring is arranged between the rail seat and the inner wall of the shell along the second direction, and the compression spring is used to apply a force to the rail seat toward the first transmission wheel.

8. The liquid level measuring device according to any one of claims 2 to 7, characterized in that: The third transmission wheel and the fourth transmission wheel are both bevel gears, and the third transmission wheel is meshed with the fourth transmission wheel.

9. The liquid level measuring device according to any one of claims 3 to 7, characterized in that: A first annular limiting groove is provided on the inner wall of the fixed cylinder, and a first limiting protrusion is provided on the outer wall of the driving column. The first limiting protrusion is arranged in the first limiting groove, and is used to limit the driving column from sliding along the first direction relative to the fixed cylinder; a second annular limiting groove is provided on the inner wall of the driving column, and a second limiting protrusion is provided on the outer wall of the adjusting rod. The second limiting protrusion is arranged in the second limiting groove, and is used to limit the adjusting rod from sliding along the first direction relative to the driving column.

10. The liquid level measuring device according to any one of claims 1 to 7, characterized in that: A protective base is provided at the bottom of the liquid box, a cavity is provided inside the protective base, the shell part is arranged in the cavity of the protective base, and the side wall of the shell marked with the scale line extends to the outside of the protective base.

11. A vacuum conditioning machine, characterized in that: The liquid level measuring device comprises the liquid level measuring device according to any one of claims 1 to 10.

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