Base oil refining device

Abstract

The present invention belongs to the technical field of refining equipment, and specifically relates to a base oil refining device. By setting a stirring mechanism and cooperating with an external heating medium to heat the waste oil in a tank body, other non-extraction solutions in the waste oil can be effectively volatilized by utilizing the boiling point difference, thereby obtaining the refined oil to be extracted; the setting of the filtering mechanism can filter and remove impurities in the waste oil before the waste oil is extracted, thereby preventing large-volume impurities in the waste oil from affecting subsequent refining operations; and the setting of a defoaming component can assist in cleaning floating foam impurities on the surface of the waste oil during the waste oil refining process, without the need for additional electronic control components, thereby achieving the effect of improving production efficiency and quality.

Description

Technical Field

[0001] The invention belongs to the technical field of refining equipment, and in particular relates to a base oil refining device. Background Art

[0002] With the continuous advancement and development of the industrialization process, various types of production machines are constantly invented and emerge. The use of such production machines has greatly improved the efficiency and quality of production. In order to maintain the stable operation of the production machines and extend their service life, lubricating oil is often used to lubricate and protect their moving joints or connections. However, lubricating oil cannot be used all the time and needs to be replaced regularly, so a large amount of waste oil is gradually generated.

[0003] With the improvement of modern environmental protection and energy-saving awareness, resource recycling and utilization has gradually become a consensus among people, and the recycling and utilization of waste oil has great environmental significance. At present, the recycling of waste mineral oil is mainly to refine it into base oil for utilization. The traditional refining method usually uses distillation to separate different liquids in the waste oil. However, due to the presence of impurities and other foreign matter in the waste oil, conventional refining equipment cannot handle impurities well and cannot meet the needs of refining. Summary of the Invention

[0004] The purpose of the present invention is to provide a base oil refining device to solve the problems mentioned in the background technology.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0006] A base oil refining device comprises a tank body and a control panel, wherein the tank body is provided with a feed port, a discharge port and an exhaust port, a stirring mechanism is provided in the tank body, and a filtering mechanism matching the stirring mechanism is provided in the tank body;

[0007] The stirring mechanism includes a motor, a stirring shaft and a stirring blade group, wherein the motor is fixedly arranged at the upper end of the tank body, the stirring shaft is rotatably arranged in the tank body and is transmission-connected to the motor, and the stirring blade group is arranged on the stirring shaft and located at the lower side of the filtering mechanism;

[0008] The filtering mechanism includes a filter plate and several plate cleaners. The filter plate is fixedly connected to the inner wall of the tank body and is coaxially connected to the stirring shaft. Several plate cleaners are evenly arranged at the lower end of the filter plate and correspond one-to-one to the filter ports of the filter plate. The tank body is also provided with a slag discharge assembly matching the filter plate.

[0009] The stirring mechanism is also provided with an injection assembly, which includes a rotary joint, an air supply pipe, an air distribution plate and several one-way air jet heads. The rotary joint is transmission-connected to the output shaft of the motor, the stirring shaft is transmission-connected to the output end of the rotary joint, the air supply pipe is connected to the rotary joint, an air passage connected to the rotary joint is opened in the middle of the stirring shaft, the air distribution plate is connected to the end of the stirring shaft and is connected to the air passage, and several one-way air jet heads are evenly arranged on the air distribution plate; the arrangement of the air injection assembly can further cooperate with the refining of waste oil and meet the needs of subsequent hydrogenation processing.

[0010] The plate cleaner includes a lever plate, a slag pushing rod, a pressure device and an arc-shaped slag removal rod. The filter plate is evenly provided with a number of filter ports, and the vertical cross-section of the filter port is a frustum-shaped structure with a small upper portion and a large lower portion. The slag pushing rod is slidably arranged on the filter port, the pressure device is arranged on the filter plate and matched with the slag pushing rod, the lever plate is arranged between the slag pushing rod and the pressure device, and the arc-shaped slag removal rod is fixedly connected to the stirring shaft and fits into the upper end of the filter plate.

[0011] The slag pushing rod includes a conical pushing block, a sliding rod and two spring pieces, the sliding rod is connected to the end with the larger diameter of the conical pushing block, the maximum diameter of the conical pushing block is larger than the minimum diameter of the filter port, the sliding rod is slidably connected to the lower end of the filter plate through a connecting ear and corresponds to the filter port, the two spring pieces are distributed in an eight-shaped shape and are arranged on the sliding rod and located on the lower side of the connecting ear, the two spring pieces are flipped toward the axis of the sliding rod in a stationary state, and the sliding rod is abutted and matched with the lever plate; in this way, the filter port can be cleaned by the conical pushing block when the lever plate flips, and it automatically resets after losing the thrust.

[0012] The pressure device includes a telescopic rod, a limit plate and a return spring. The filter plate is provided with a double-opening step cavity. The telescopic rod is slidably connected to the filter plate through the double-opening step cavity and corresponds to the other end of the lever plate. The limit plate is connected to the telescopic rod and is located in the double-opening step cavity. The return spring is sleeved on the telescopic rod and is located at the lower end of the limit plate in the double-opening step cavity. The telescopic rod extending out from the upper end of the filter plate is conical; in this way, it can cooperate with the arc-shaped slag removal rod to apply pressure to the lever plate to remove impurities in the filter port and avoid clogging.

[0013] The slag discharge assembly includes a slag receiving bucket and a slag discharge pipe. The slag receiving bucket is annular and has a U-shaped vertical cross-section. The slag receiving bucket is fixedly connected to the inner wall of the tank body and connected to the filter plate. The slag discharge pipe is arranged on the side of the tank body and connected to the slag receiving bucket. This can more effectively collect large-volume residues, avoid clogging the filter plate, and also make it easier to discharge residues.

[0014] A defoaming assembly is also provided between the stirring shaft and the slag receiving hopper. The defoaming assembly includes two guides and two foam pushers. The two guides and the two foam pushers are centrally symmetrically distributed. The guides are connected to the slag receiving hopper, and the foam pushers are connected to the stirring shaft.

[0015] The guide includes a spiral plate and a guide bucket. The spiral plate is connected to the slag receiving bucket. The slag receiving bucket is symmetrically provided with a notch matching the spiral plate on one side facing the stirring shaft. The guide bucket is connected to the end of the spiral plate and matches the notch. The vertical cross-section of the guide bucket is U-shaped and is tilted to the side of the slag receiving bucket. The setting of the spiral plate and the foam pusher can effectively guide floating foam and impurities into the slag receiving bucket, which is beneficial to refining production.

[0016] The foam pusher includes a horizontal plate, a rubber strip and an elastic member. A movable groove is opened on the side of the stirring shaft. The horizontal plate is slidably arranged in the movable groove. The elastic member is arranged between the upper end of the horizontal plate and the upper inner wall of the movable groove. The rubber strip is connected to the lower end of the horizontal plate and matches the spiral plate. The lowest horizontal height of the foam pusher in a static state is higher than the lowest horizontal height of the spiral plate; in this way, the floating foam in the waste oil can be effectively removed to cooperate with the movement of the stirring shaft.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] By setting up a stirring mechanism and coordinating with an external heating medium to heat the waste oil in the tank, other non-extraction solutions in the waste oil can be effectively volatilized by utilizing the boiling point difference, thereby obtaining the refined oil that needs to be extracted; the setting up of the filtering mechanism can filter and remove impurities in the waste oil before the waste oil is extracted, thereby preventing large-volume impurities in the waste oil from affecting subsequent refining operations; and in conjunction with the setting up of the defoaming component, it can assist in cleaning the floating foam impurities on the surface of the waste oil during the waste oil refining process without the need for additional electronic control components, thereby achieving the effect of improving production efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further illustrated by means of the following non-limiting examples.

[0020] Figure 1 This is a structural schematic diagram of a base oil refining device of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the stirring mechanism of the present invention.

[0023] Figure 4This is a schematic structural diagram of the stirring mechanism of the present invention from another angle.

[0024] Figure 5 for Figure 4 Enlarged schematic diagram of point A in the middle.

[0025] Figure 6 It is a partial structural cross-sectional view of the present invention.

[0026] Figure 7 It is a structural sectional view of the stirring mechanism of the present invention.

[0027] Figure 8 It is a structural diagram of another embodiment of the present invention.

[0028] Tank body 1, feed port 11, discharge port 12, exhaust port 13, motor 2, stirring shaft 21, stirring blade group 22, filter plate 23, filter port 24, rotary joint 3, air pipe 31, air distribution plate 32, one-way jet head 33, air duct 34, lever plate 4, arc-shaped slag removal rod 41, conical push block 5, slide bar 51, spring 52, telescopic rod 6, limit plate 61, return spring 62, double-opening step cavity 63, slag receiving bucket 7, slag discharge pipe 71, spiral plate 8, guide bucket 81, notch 82, cross plate 9, rubber strip 91, movable groove 92. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0030] Example 1:

[0031] like Figure 1-8 As shown, a base oil refining device includes a tank body 1 and a control panel. The tank body 1 is provided with a feed port 11, a discharge port 12 and an exhaust port 13. The characteristics are: a stirring mechanism is provided in the tank body 1, and a filtering mechanism matching the stirring mechanism is provided in the tank body 1;

[0032] The stirring mechanism includes a motor 2, a stirring shaft 21 and a stirring blade group 22. The motor 2 is fixedly arranged at the upper end of the tank body 1. The stirring shaft 21 is rotatably arranged in the tank body 1 and is transmission-connected to the motor 2. The stirring blade group 22 is arranged on the stirring shaft 21 and is located on the lower side of the filtering mechanism.

[0033] The filtering mechanism includes a filter plate 23 and several plate cleaners. The filter plate 23 is fixedly connected to the inner wall of the tank body 1 and is coaxially connected to the stirring shaft 21. Several plate cleaners are evenly arranged at the lower end of the filter plate 23 and correspond one-to-one to the filter ports 24 of the filter plate 23. The tank body 1 is also provided with a slag discharge assembly matching the filter plate 23.

[0034] When recycling and refining waste oil, in order to ensure the purity of the refined oil, it is necessary to first remove impurities and foreign matter in the waste oil to facilitate the needs of subsequent processes. When the waste oil is removed and refined by this device, the waste oil is poured into the tank body 1 through the feed port 11. When the waste oil is poured into the tank body 1, the filtering mechanism will first filter the large volume of residue in the waste oil to avoid impurities with excessive volume affecting the normal operation of subsequent components, and at the same time avoid excessive impurities from quickly accumulating, resulting in the need for multiple cleanings of the subsequent sedimentation tank affecting production efficiency. After the waste oil is poured into, the waste oil in the tank body 1 can be heated by an external heating medium. Due to the difference in boiling points of the liquids, the vaporized non-recoverable liquid can be discharged through the exhaust port 13, so that the required refined oil can be preserved in the tank body 1. During the refining process, the motor 2 is started to drive the stirring shaft 21 to rotate, and then the mixture in the tank body 1 is stirred by the stirring blade group 22, thereby promoting the vaporization and discharge efficiency of the non-refined liquid. Finally, the preliminarily refined refined oil can be discharged through the discharge port 12 to prepare for the next processing step. The plate cleaner can automatically clean the filter plate 23 without manual cleaning, thereby effectively reducing the number of shutdowns and the cost and difficulty of manual cleaning, which is more conducive to production needs.

[0035] The plate cleaner includes a lever plate 4, a slag pushing rod, a pressure device and an arc-shaped slag removing rod 41. The filter plate 23 is evenly provided with a number of filter ports 24. The vertical section of the filter port 24 is a conical structure with a small upper part and a large lower part. The slag pushing rod is slidably arranged in the filter port 24. The pressure device is arranged on the filter plate 23 and matched with the slag pushing rod. The lever plate 4 is arranged between the slag pushing rod and the pressure device. The arc-shaped slag removing rod 41 is fixedly connected to the stirring shaft 21 and fits into the upper end of the filter plate 23; when the stirring shaft 21 stirs the waste oil in the tank body 1, it will also drive the arc-shaped slag removing rod 41 to move on the filter plate 23, and then the arc-shaped slag removing rod 41 acts on the slag pushing rod and the pressure device, and then the filter port 24 on the filter plate 23 is cleared of impurities to avoid impurity blockage affecting the filtration efficiency.

[0036] The slag pushing rod includes a conical pushing block 5, a sliding rod 51 and two spring pieces 52. The sliding rod 51 is connected to the end with the larger diameter of the conical pushing block 5. The maximum diameter of the conical pushing block 5 is larger than the minimum diameter of the filter port 24. The sliding rod 51 is slidably connected to the lower end of the filter plate 23 through the connecting ear and corresponds to the filter port 24. The two spring pieces 52 are distributed in an eight-shaped shape and are arranged on the sliding rod 51 and are located on the lower side of the connecting ear. When the two spring pieces 52 are stationary, they flip toward the axis of the sliding rod 51, and the sliding rod 51 abuts and matches with the lever plate 4; when the arc-shaped slag removing rod 41 moves, it will squeeze the pressure device and make the pressure device move downward. When the pressure device moves downward, it will push the lever plate 4, and the In the static state, the lever plate 4 is pushed by the slide bar 51 to flip toward the pressure device side. Correspondingly, in the above case, the lever plate 4 will push the slide bar 51 to move similarly. In this process, the two spring pieces 52 will be pushed open, and the conical push block 5 will gradually move upward to push and discharge the large volume impurities stuck in the filter port 24, and cooperate with the arc-shaped slag removal rod 41 in the continuous movement process to clean it. When the arc-shaped slag removal rod 41 completely passes over the pressure device, the pressure device loses pressure and the push on the lever plate 4 will be cancelled. At this time, the tension of the spring piece 52 can reset the component to avoid affecting the filtering needs of the waste oil.

[0037] When the filter plate 23 is opened, the filter plate 23 is provided with a double-opening step cavity 63. The filter plate 23 is provided with a double-opening step cavity 63. The filter plate 23 is provided with a double-opening step cavity 63. The filter plate 23 is slidably connected to the filter plate 23 through the double-opening step cavity 63 and is matched with the other end of the lever plate 4. The limit plate 61 is connected to the filter plate 6 and is located in the double-opening step cavity 63. The return spring 62 is sleeved on the telescopic rod 6 and is located at the lower end of the limit plate 61 in the double-opening step cavity 63. The telescopic rod 6 extends out of the filter plate 23 and is tapered at one end. In the initial state, the telescopic rod 6 cooperates with the limit plate 61 and is acted upon by the return spring 62 to maintain an upwardly extended state. With the action of the arc-shaped slag removal rod 41, the telescopic rod 6 will be pushed. The upper end of the telescopic rod 6 is tapered to ensure that the telescopic rod 6 is effectively pushed. Further, when the telescopic rod 6 moves downward, it will extend out of the lower end of the filter plate 23 and push the lever plate 4 on the lower side, thereby causing the lever plate 4 to flip and drive the slag pushing rod to perform a cleaning action. The entire cleaning action is synchronized with the stirring mechanism to achieve an effective cleaning effect.

[0038] The slag discharge assembly includes a slag receiving bucket 7 and a slag discharge pipe 71. The slag receiving bucket 7 is annular and has a U-shaped vertical cross-section. The slag receiving bucket 7 is fixedly connected to the inner wall of the tank body 1 and is connected to the filter plate 23. The slag discharge pipe 71 is arranged on the side of the tank body 1 and is connected to the slag receiving bucket 7; when the arc-shaped slag removal rod 41 cleans the impurities on the filter plate 23, the arc-shaped slag removal rod 41 will push and guide the impurities to move away from the axis of the tank body 1, so they will be concentrated in the slag receiving bucket 7 for temporary storage, and finally the slag discharge pipe 71 and the external valve can be opened for cleaning.

[0039] Example 2:

[0040] like Figure 3-4 and Figure 7 As shown, based on the further improvement of the first embodiment, the stirring mechanism is further provided with a gas injection assembly, which includes a rotary joint 3, an air supply pipe 31, an air distribution plate 32 and a plurality of one-way jet heads 33. The rotary joint 3 is connected to the output shaft of the motor 2, the stirring shaft 21 is connected to the output end of the rotary joint 3, the air supply pipe 31 is connected to the rotary joint 3, an air passage 34 connected to the rotary joint 3 is opened in the middle of the stirring shaft 21, the air distribution plate 32 is connected to the end of the stirring shaft 21 and is connected to the air passage 34, and a plurality of one-way jet heads 33 are evenly arranged on the air distribution plate 32.

[0041] In order to further increase the discharge speed of other liquids after volatilization, hot air can be injected through the air pipe 31 and the rotary joint 3 during the refining process. The hot air will be input into the air channel 34 through the rotary joint 3, and then into the air distribution plate 32 from the air channel 34 and ejected by a plurality of one-way nozzles 33. This can not only assist in the churning and heating of the refined liquid in the tank body 1, but also assist in heating. At the same time, the flow direction of the hot air from bottom to top and the exhaust port 13 can more quickly and effectively discharge the volatile gases, which is beneficial to the refining process.

[0042] Furthermore, when only refined oil remains in the tank body 1, hydrogenation treatment is often performed to improve the quality of the recovered base oil. Since the tank body 1 is still at a high temperature after refining, hydrogen can be injected in the same way as hot air. This can improve processing efficiency, reduce transfer processes, and make full use of the high-temperature environment required for hydrogenation treatment, thereby reducing energy consumption.

[0043] Example 3:

[0044] like Figure 8As shown, in a further improvement based on the first embodiment, a defoaming assembly is further provided between the stirring shaft 21 and the slag receiving bucket 7, the defoaming assembly includes two guides and two foam pushers, the two guides and the two foam pushers are symmetrically distributed in the center, the guide is connected to the slag receiving bucket 7, and the foam pushers are connected to the stirring shaft 21; the guide includes a spiral plate 8 and a guide bucket 81, the spiral plate 8 is connected to the slag receiving bucket 7, and the slag receiving bucket 7 is symmetrically opened with a notch 82 matching the spiral plate 8 on one side facing the stirring shaft 21, and the guide bucket 81 is connected to the stirring shaft 21. The ends of the spiral plate 8 are connected and matched with the notch 82. The vertical cross-section of the guide bucket 81 is U-shaped and is inclined toward the slag receiving bucket 7. The foam pusher includes a horizontal plate 9, a rubber strip 91 and an elastic member. A movable groove 92 is opened on the side of the stirring shaft 21. The horizontal plate 9 is slidably arranged in the movable groove 92. The elastic member is arranged between the upper end of the horizontal plate 9 and the upper inner wall of the movable groove 92. The rubber strip 91 is connected to the lower end of the horizontal plate 9 and matches the spiral plate 8. The lowest horizontal height of the foam pusher in the static state is higher than the lowest horizontal height of the spiral plate 8.

[0045] When the waste oil enters the tank body 1, a mixture of foam and other impurities may appear on the liquid surface during the heating and stirring process. In order to prevent this substance from mixing into the refined oil and affecting the subsequent processing, during the refining process, the rotation of the stirring shaft 21 will synchronously drive the two foam pushers to move. In the initial state, the lowest level of the foam pushers is higher than the lowest level of the spiral plate 8, so that the foam pushers can cooperate with the guide in any case. When the cross plate 9 in the foam pusher moves, it will gradually abut against the spiral plate 8. Since the cross plate 9 is slidably connected to the stirring shaft 21 through the movable groove 92, the lifting of the spiral plate 8 will make The horizontal plate 9 gradually rises and moves forward, and with the elastic effect of the rubber strip 91 itself, the foam on the surface of the liquid will be gradually pushed to the spiral plate 8 until it reaches the guide bucket 81 and is collected in the slag receiving bucket 7. When the horizontal plate 9 completely passes over the spiral plate 8, the elastic member will reset the horizontal plate 9 and it will drop and reset to prepare for the next defoaming action. This cyclical movement can cooperate with the refining work action and is more conducive to the recovery of high-quality refined oil. At the same time, since the spiral plate 8 itself has a certain longitudinal height, it can also meet the continuously decreasing liquid level height and always maintain the defoaming effect and function.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A base oil refining device, comprising a tank body and a control panel, wherein the tank body is provided with a feed port, a discharge port and an exhaust port, and is characterized in that: The tank body is provided with a stirring mechanism, and the tank body is provided with a filtering mechanism matching the stirring mechanism; The stirring mechanism includes a motor, a stirring shaft and a stirring blade group, wherein the motor is fixedly arranged at the upper end of the tank body, the stirring shaft is rotatably arranged in the tank body and is transmission-connected to the motor, and the stirring blade group is arranged on the stirring shaft and located at the lower side of the filtering mechanism; The filtering mechanism includes a filter plate and a plurality of plate cleaners, wherein the filter plate is fixedly connected to the inner wall of the tank body and is coaxially connected to the stirring shaft, and the plurality of plate cleaners are evenly arranged at the lower end of the filter plate and correspond one to one to the filter openings of the filter plate. The tank body is also provided with a slag discharge assembly matching the filter plate; The stirring mechanism is further provided with an air injection assembly, which includes a rotary joint, an air supply pipe, an air distribution plate and a plurality of one-way air jet heads. The rotary joint is drivingly connected to the output shaft of the motor, the stirring shaft is drivingly connected to the output end of the rotary joint, the air supply pipe is connected to the rotary joint, an air passage communicating with the rotary joint is opened in the middle of the stirring shaft, the air distribution plate is connected to the end of the stirring shaft and communicates with the air passage, and a plurality of one-way air jet heads are evenly arranged on the air distribution plate; The plate cleaner includes a lever plate, a slag pushing rod, a pressure device and an arc-shaped slag removing rod. The filter plate is evenly provided with a plurality of filter ports, and the vertical cross-section of the filter ports is a frustum-shaped structure with a small upper portion and a large lower portion. The slag pushing rod is slidably arranged on the filter port, and the pressure device is arranged on the filter plate and matched with the slag pushing rod. The lever plate is arranged between the slag pushing rod and the pressure device, and the arc-shaped slag removing rod is fixedly connected to the stirring shaft and fits the upper end of the filter plate. The pressure device includes a telescopic rod, a limit plate and a return spring. The filter plate is provided with a double-opening step cavity. The telescopic rod is slidably connected to the filter plate through the double-opening step cavity and corresponds to the other end of the lever plate. The limit plate is connected to the telescopic rod and is located in the double-opening step cavity. The return spring is sleeved on the telescopic rod and is located at the lower end of the limit plate in the double-opening step cavity. The telescopic rod extending out from the upper side of the filter plate is conical.

2. A base oil refining device according to claim 1, characterized in that: The slag discharge assembly includes a slag receiving bucket and a slag discharge pipe. The slag receiving bucket is annular and has a U-shaped vertical cross-section. The slag receiving bucket is fixedly connected to the inner wall of the tank body and connected to the filter plate. The slag discharge pipe is arranged on the side of the tank body and connected to the slag receiving bucket.

3. A base oil refining device according to claim 2, characterized in that: A defoaming assembly is also provided between the stirring shaft and the slag receiving hopper. The defoaming assembly includes two guides and two foam pushers. The two guides and the two foam pushers are centrally symmetrically distributed. The guides are connected to the slag receiving hopper, and the foam pushers are connected to the stirring shaft.

4. A base oil refining device according to claim 3, characterized in that: The guide includes a spiral plate and a guide bucket. The spiral plate is connected to the slag receiving bucket. The slag receiving bucket has a notch symmetrically opened on the side facing the stirring shaft that matches the spiral plate. The guide bucket is connected to the end of the spiral plate and matches the notch. The vertical cross-section of the guide bucket is U-shaped and is tilted toward the slag receiving bucket side.

5. A base oil refining device according to claim 4, characterized in that: The foam pusher includes a horizontal plate, a rubber strip and an elastic member. A movable groove is opened on the side of the stirring shaft. The horizontal plate is slidably arranged in the movable groove. The elastic member is arranged between the upper end of the horizontal plate and the upper inner wall of the movable groove. The rubber strip is connected to the lower end of the horizontal plate and matches the spiral plate. The lowest horizontal height of the foam pusher in a static state is higher than the lowest horizontal height of the spiral plate.

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