A vacuum freeze-drying apparatus for pharmaceuticals

Abstract

The application relates to the technical field of pharmaceutical processing, in particular to a vacuum freeze-drying device for medicines, which mainly comprises a fixing frame, a vacuum tank is installed on the top surface of the fixing frame, one end of the vacuum tank is provided with a tank cover, and the vacuum freeze-drying device further comprises a dispersing mechanism, which is arranged in the vacuum tank, and a vibrating mechanism, which is arranged in the vacuum tank. By starting the motor, the rotating strip and the cylinder are driven to rotate, the cylinder moves in the vertical groove and drives the moving strip and the connecting strip to reciprocate, the connecting strip drives the concave strip, the dispersing column and the adjusting column to reciprocate, meanwhile, the adjusting column moves in the adjusting groove, so that the adjusting column reciprocates left and right during reciprocation, drives the fixed strip and the concave strip to reciprocate, drives the adjusting rod to swing in an arc shape, drives the dispersing column to swing in an arc shape, and the dispersing column swings left and right in an arc shape during reciprocation, the dispersing column pushes the medicine on the placing frame to disperse, so that the medicine is more evenly dispersed, and the drying efficiency and quality of the medicine are improved.

Description

Technical Field

[0001] This invention relates to the field of pharmaceutical processing technology, specifically to a vacuum freeze-drying apparatus for pharmaceuticals. Background Technology

[0002] In pharmaceutical production, vacuum freeze-drying equipment is a key piece of equipment. It effectively removes moisture from drugs by combining low-temperature freezing with vacuum dehydration, while preserving the active ingredients and stability of the drug. Vacuum freeze-drying operates based on the principle of sublimation: water-containing drugs are frozen into solid ice crystals at low temperatures, and then heated in a vacuum environment to directly sublimate the ice crystals into water vapor, thereby removing the moisture from the drug. This process avoids the damage to drug components caused by high temperatures and is particularly suitable for drying heat-sensitive and easily oxidized drugs.

[0003] When drying drugs using a vacuum freeze-drying device, the drugs are placed on a rack and pushed into a vacuum chamber for drying. Because the drugs are placed directly on the rack, the bottom of the drugs is blocked during drying, and the top of the drugs dries faster than the bottom, resulting in uneven drying and reduced drying quality. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum freeze-drying apparatus for pharmaceuticals to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A vacuum freeze-drying apparatus for pharmaceuticals includes: a fixed frame, a vacuum container mounted on the top surface of the fixed frame, a container lid mounted on one end of the vacuum container, a mounting frame mounted on the inner wall of the vacuum container, and a placement rack disposed above the mounting frame; and further includes: The dispersion mechanism is located inside the vacuum tank. The dispersion mechanism includes multiple connecting strips located inside the vacuum tank. The connecting strips are provided with through grooves. Multiple dispersion columns are rotatably installed on the inner wall of the through grooves through multiple rotating shafts. Multiple fixing plates are fixedly installed on the inner wall of the vacuum tank. Adjustment columns are provided below the connecting strips. The vibration mechanism is located inside the vacuum tank. The vibration mechanism includes a connecting frame fixedly installed on the bottom surface of the fixed plate. An arc-shaped strip is provided below the connecting frame, and a striking head is fixedly installed at one end of the arc-shaped strip.

[0006] Preferably, a condenser and a circulating pump are installed on the inner wall of the fixed frame. One end of the condenser is connected to the circulating pump through a connecting pipe. A heat-conducting pipe is installed inside the vacuum tank. One end of the heat-conducting pipe is connected to the circulating pump through a liquid inlet pipe, and the other end of the heat-conducting pipe is connected to the condenser through a liquid outlet pipe.

[0007] Preferably, a vacuum pump is installed on the inner wall of the mounting frame, and the vacuum pump is connected to the vacuum tank through a connecting pipe. A guide rail is installed on the top surface of the mounting frame, and a sliding sleeve is movably installed on the outer wall of the guide rail. The top surface of the sliding sleeve is fixedly connected to the bottom surface of the mounting frame.

[0008] Preferably, two limiting strips are fixedly installed on the inner wall of one end of the vacuum tank, and a limiting sleeve is slidably installed on the outer wall of each limiting strip. A movable strip is fixedly installed on the side of the limiting sleeve, and the side of the movable strip is fixedly connected to one end of the connecting strip.

[0009] Preferably, a motor is fixedly installed on the side of the vacuum tank. The output rod of the motor rotates through the vacuum tank and extends into the interior of the vacuum tank. A rotating bar is fixedly installed on the outer wall of the output rod of the motor. A cylinder is fixedly installed at one end of the rotating bar. A vertical groove is provided on the side of the rotating bar. The outer wall of the cylinder is slidably connected to the inner wall of the vertical groove.

[0010] Preferably, a concave strip is slidably installed on the inner wall of the through groove, and two fixed rods are slidably installed through the concave strip. The two ends of the fixed rods are fixedly connected to the inner wall of the through groove, and an elastic element is movably installed on the outer wall of the fixed rod. The two ends of the elastic element are fixedly connected to the side of the concave strip and the inner wall of the through groove.

[0011] Preferably, the concave strip is provided with a strip groove, the connecting strip is provided with an arc groove, and the dispersing column is provided with an adjusting rod, the outer wall of the adjusting rod being slidably connected to the inner wall of the arc groove and the inner wall of the strip groove.

[0012] Preferably, the bottom surface of the connecting strip is provided with a groove, one end of the concave strip is fixedly installed with a fixing strip, the other end of the fixing strip slides through the groove and extends into the groove, the bottom surface of the fixing strip is fixedly connected to the top surface of the adjusting column, the fixing plate is provided with an adjusting groove, the middle of the adjusting groove is set to a horizontal state, the two ends are set to a corrugated shape, and the outer wall of the adjusting column is slidably connected to the inner wall of the adjusting groove.

[0013] Preferably, a connecting shaft is installed through the arc-shaped strip, and both ends of the connecting shaft are rotatably connected to the inner wall of the connecting frame through bearings.

[0014] Preferably, a torsion spring is movably installed on the outer wall of the connecting shaft. One end of the torsion spring is fixedly connected to the inner wall of the connecting frame, and the other end of the torsion spring abuts against the bottom surface of the arc-shaped strip. The bottom surface of the adjusting column is slidably connected to the top surface of the arc-shaped strip.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a motor to rotate a rotating bar and a cylinder. The cylinder moves within a vertical groove, causing a moving bar and a connecting bar to reciprocate. The connecting bar then drives a concave bar, a dispersing column, and an adjusting column to reciprocate. Simultaneously, as the adjusting column reciprocates, it moves within an adjusting groove, which is corrugated. This causes the adjusting column to move left and right during its reciprocating motion, driving the fixing bar and the concave bar to reciprocate. The groove on the concave bar causes the adjusting rod to swing back and forth in an arc, which in turn causes the dispersing column to swing back and forth in an arc. During its back-and-forth reciprocating motion, the dispersing column swings left and right in an arc, pushing and dispersing the drug on the shelf, resulting in more uniform drug dispersion and thus improving the drying efficiency and quality of the drug. When the adjustable column moves back and forth, it presses against the arc-shaped strip as it passes the arc-shaped strip. One end of the arc-shaped strip moves downward, while the other end drives the tapping head to tap and vibrate the bottom of the rack. This causes the medicine on the rack to vibrate, and the medicine disperses more evenly during the vibration process, further improving the drying efficiency and quality of the medicine. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the back of the three-dimensional structure of the present invention; Figure 3 This is a schematic cross-sectional view of the three-dimensional structure of the vacuum tank of the present invention; Figure 4 This is an exploded view of the cylindrical structure of the present invention. Figure 5 This is a three-dimensional structural diagram of the placement rack of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 This is a three-dimensional structural diagram of the fixing plate of the present invention; Figure 8 This is an exploded view of the three-dimensional structure of the concave strip of the present invention; Figure 9 This is a three-dimensional structural diagram of the striking head of the present invention.

[0017] In the picture:

[0018] 1. Fixing frame; 101. Vacuum tank; 102. Mounting frame; 103. Guide rail; 104. Placement rack; 105. Sliding sleeve; 106. Tank lid; 107. Heat pipe; 108. Condenser; 109. Circulation pump; 110. Connecting pipe; 111. Liquid inlet pipe; 112. Liquid outlet pipe; 113. Vacuum pump; 114. Connecting pipe; 2. Dispersion mechanism; 201. Limiting strip; 202. Limiting sleeve; 203. Moving strip; 204. Motor; 205. Rotating strip; 206. Cylinder; 207. Vertical groove; 208. Connecting strip; 209. Through groove; 210. Rotating shaft; 211. Dispersion column; 212. Concave strip; 213. Strip groove; 214. Fixing rod; 215. Elastic element; 216. Adjusting rod; 217. Arc groove; 218. Groove body; 219. Fixing strip; 220. Adjusting column; 221. Fixing plate; 222. Adjusting groove; 3. Vibration mechanism; 301. Connecting frame; 302. Connecting shaft; 303. Arc strip; 304. Striking head; 305. Torsion spring. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] like Figures 1-9 As shown, this application provides a vacuum freeze-drying apparatus for pharmaceuticals, comprising: a fixed frame 1, a vacuum container 101 mounted on the top surface of the fixed frame 1, a container lid 106 mounted on one end of the vacuum container 101, a mounting frame 102 mounted on the inner wall of the vacuum container 101, and a placement rack 104 disposed above the mounting frame 102, and further comprising: Specifically, such as Figures 1-9 As shown, a condenser 108 and a circulation pump 109 are installed on the inner wall of the fixed frame 1. One end of the condenser 108 is connected to the circulation pump 109 through a connecting pipe 110. A heat conduction pipe 107 is installed inside the vacuum tank 101. One end of the heat conduction pipe 107 is connected to the circulation pump 109 through a liquid inlet pipe 111, and the other end of the heat conduction pipe 107 is connected to the condenser 108 through a liquid outlet pipe 112.

[0022] In this embodiment: the liquid in the condenser 108 and the heat pipe 107 is circulated by the circulation pump 109. The condenser 108 cools the heat pipe 107 through the liquid and the heat pipe 107 removes the heat inside the vacuum tank 101.

[0023] Specifically, such as Figures 1-9As shown, a vacuum pump 113 is installed on the inner wall of the fixed frame 1. The vacuum pump 113 is connected to the vacuum tank 101 through the connecting pipe 114. A guide rail 103 is installed on the top surface of the mounting frame 102. A sliding sleeve 105 is movably installed on the outer wall of the guide rail 103. The top surface of the sliding sleeve 105 is fixedly connected to the bottom surface of the placement frame 104.

[0024] In this embodiment: the vacuum pump 113 and the connecting pipe 114 are used to evacuate the vacuum tank 101 to ensure that the inside of the vacuum tank 101 is in a vacuum state.

[0025] The dispersion mechanism 2 is located inside the vacuum tank 101. The dispersion mechanism 2 includes multiple connecting strips 208 located inside the vacuum tank 101. The connecting strips 208 are provided with through grooves 209. Multiple dispersion columns 211 are rotatably installed on the inner wall of the through grooves 209 through multiple rotating shafts 210. Multiple fixing plates 221 are fixedly installed on the inner wall of the vacuum tank 101. An adjusting column 220 is provided below the connecting strips 208. Specifically, such as Figures 1-9 As shown, two limiting strips 201 are fixedly installed on the inner wall of one end of the vacuum tank 101. A limiting sleeve 202 is slidably installed on the outer wall of each limiting strip 201. A moving strip 203 is fixedly installed on the side of the limiting sleeve 202. The side of the moving strip 203 is fixedly connected to one end of the connecting strip 208.

[0026] In this embodiment: the limiting strip 201 limits the limiting sleeve 202, making the movement of the limiting sleeve 202, the moving strip 203 and the connecting strip 208 more stable.

[0027] Specifically, such as Figures 1-9 As shown, a motor 204 is fixedly installed on the side of the vacuum tank 101. The output rod of the motor 204 rotates through the vacuum tank 101 and extends into the interior of the vacuum tank 101. A rotating bar 205 is fixedly installed on the outer wall of the output rod of the motor 204. A cylinder 206 is fixedly installed at one end of the rotating bar 205. A vertical groove 207 is provided on the side of the moving bar 203. The outer wall of the cylinder 206 is slidably connected to the inner wall of the vertical groove 207.

[0028] In this embodiment: the motor 204 drives the rotating bar 205 and the cylinder 206 to rotate, and the cylinder 206 cooperates with the vertical groove 207 to drive the moving bar 203 to move back and forth.

[0029] Specifically, such as Figures 1-9 As shown, a concave strip 212 is slidably installed on the inner wall of the through groove 209. Two fixed rods 214 are slidably installed through the concave strip 212. The two ends of the fixed rods 214 are fixedly connected to the inner wall of the through groove 209. An elastic element 215 is movably installed on the outer wall of the fixed rods 214. The two ends of the elastic element 215 are fixedly connected to the side of the concave strip 212 and the inner wall of the through groove 209.

[0030] In this embodiment: the fixed rod 214 limits the concave strip 212, making the movement of the concave strip 212 more stable, and the elastic element 215 applies elastic force to the concave strip 212.

[0031] Specifically, such as Figures 1-9 As shown, the concave strip 212 is provided with a through-groove 213, the connecting strip 208 is provided with a through-groove 217, and the dispersing column 211 is provided with an adjusting rod 216. The outer wall of the adjusting rod 216 is slidably connected to the inner wall of the arc groove 217 and the inner wall of the strip groove 213.

[0032] In this embodiment: the arc-shaped groove 217 limits the adjustment rod 216, making the dispersion column 211 and the adjustment rod 216 more stable during the rotation of a certain angle. The strip groove 213 drives the adjustment rod 216 to rotate back and forth in the arc groove 217 when the concave strip 212 moves back and forth, thus driving the dispersion column 211 to rotate back and forth in an arc.

[0033] Specifically, such as Figures 1-9 As shown, the bottom surface of the connecting strip 208 is provided with a groove 218, one end of the concave strip 212 is fixedly installed with a fixing strip 219, the other end of the fixing strip 219 slides through the through groove 209 and extends into the inside of the groove 218, the bottom surface of the fixing strip 219 is fixedly connected to the top surface of the adjusting column 220, the fixing plate 221 is provided with an adjusting groove 222, the middle of the adjusting groove 222 is set to a horizontal state, and the two ends are set to a corrugated shape, and the outer wall of the adjusting column 220 is slidably connected to the inner wall of the adjusting groove 222.

[0034] In this embodiment: the middle of the adjusting groove 222 is set to a horizontal state and the two ends are set to a corrugated state. When the adjusting column 220 moves in the corrugated groove, the adjusting column 220 drives the fixing bar 219 to move back and forth. When the adjusting column 220 moves at the horizontal position of the adjusting groove 222, the adjusting column 220 will not drive the fixing bar 219 to move back and forth.

[0035] Vibration mechanism 3 is located inside vacuum tank 101. Vibration mechanism 3 includes a connecting frame 301 fixedly installed on the bottom surface of fixed plate 221. An arc-shaped strip 303 is provided below the connecting frame 301. A striking head 304 is fixedly installed at one end of the arc-shaped strip 303.

[0036] Specifically, such as Figures 1-9 As shown, a connecting shaft 302 is installed through the arc-shaped strip 303, and the two ends of the connecting shaft 302 are rotatably connected to the inner wall of the connecting frame 301 through bearings.

[0037] In this embodiment: the two ends of the connecting shaft 302 are rotatably connected to the inner wall of the connecting frame 301 through bearings, so that the arc strip 303 and the striking head 304 can rotate, and the striking head 304 can strike and vibrate the placement frame 104.

[0038] Specifically, such as Figures 1-9 As shown, a torsion spring 305 is movably installed on the outer wall of the connecting shaft 302. One end of the torsion spring 305 is fixedly connected to the inner wall of the connecting frame 301, and the other end of the torsion spring 305 abuts against the bottom surface of the arc-shaped strip 303. The bottom surface of the adjusting column 220 is slidably connected to the top surface of the arc-shaped strip 303.

[0039] In this embodiment: the torsion spring 305 applies elastic force to the arc-shaped strip 303. When the adjusting column 220 moves to the horizontal position of the adjusting groove 222, the adjusting column 220 squeezes the arc-shaped strip 303, causing one end of the arc-shaped strip 303 to move downward, and the other end of the arc-shaped strip 303 drives the striking head 304 to strike and vibrate the placement frame 104.

[0040] The specific solution is as follows: After placing the drug on the placement rack 104, push the placement rack 104 into the vacuum tank 101 and fix it. Close the tank lid 106. Heat the inside of the vacuum tank 101 through the circulation pump 109, condenser 108 and heat pipe 107. Vacuum pump 113 evacuates the vacuum tank 101 through the connecting pipe 114. Turn on the motor 204 to drive the rotating bar 205 and cylinder 206 to rotate. The cylinder 206 moves in the vertical groove 207 and drives the moving bar 203 and connecting bar 208 to move back and forth. The connecting bar 208 drives the concave bar 212, dispersing column 211 and adjusting column 220 to move back and forth. At the same time, when the adjusting column 220 moves back and forth, it moves in the adjusting groove 222. The adjusting groove 222 is set in a corrugated shape, so that the adjusting column 220 moves left and right during the reciprocating movement. The reciprocating movement causes the fixed strip 219 and concave strip 212 to move back and forth. The groove 213 on the concave strip 212 causes the adjusting rod 216 to swing back and forth in an arc, which in turn causes the dispersing column 211 to swing back and forth in an arc. During the back-and-forth reciprocating movement, the dispersing column 211 swings left and right in an arc. The dispersing column 211 pushes and disperses the medicine on the placement rack 104, making the medicine more evenly dispersed. When the adjusting column 220 moves back and forth, when the adjusting column 220 passes the arc strip 303, the adjusting column 220 squeezes the arc strip 303, and one end of the arc strip 303 moves downward. At this time, the other end of the arc strip 303 drives the tapping head 304 to tap and vibrate the bottom of the placement rack 104, making the medicine on the placement rack 104 vibrate. During the vibration, the medicine is dispersed more evenly, further improving the drying efficiency and quality of the medicine.

[0041] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

[0042] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A vacuum freeze-drying apparatus for pharmaceuticals, comprising: A fixing frame (1) is provided, on the top surface of which a vacuum tank (101) is mounted, a lid (106) is mounted at one end of the vacuum tank (101), a mounting frame (102) is mounted on the inner wall of the vacuum tank (101), and a placement rack (104) is provided above the mounting frame (102). The feature is that it further includes: The dispersion mechanism (2) is located inside the vacuum tank (101). The dispersion mechanism (2) includes multiple connecting strips (208) located inside the vacuum tank (101). The connecting strips (208) are provided with through grooves (209). Multiple dispersion columns (211) are rotatably installed on the inner wall of the through grooves (209) through multiple rotating shafts (210). Multiple fixing plates (221) are fixedly installed on the inner wall of the vacuum tank (101). An adjusting column (220) is provided below the connecting strips (208). Vibration mechanism (3) is installed inside vacuum tank (101). The vibration mechanism (3) includes a connecting frame (301) fixedly installed on the bottom surface of fixed plate (221). An arc strip (303) is provided below the connecting frame (301). A striking head (304) is fixedly installed at one end of the arc strip (303).

2. The vacuum freeze-drying apparatus for pharmaceuticals according to claim 1, characterized in that, The inner wall of the fixed frame (1) is equipped with a condenser (108) and a circulation pump (109). One end of the condenser (108) is connected to the circulation pump (109) through a connecting pipe (110). The vacuum tank (101) is equipped with a heat-conducting pipe (107). One end of the heat-conducting pipe (107) is connected to the circulation pump (109) through a liquid inlet pipe (111), and the other end of the heat-conducting pipe (107) is connected to the condenser (108) through a liquid outlet pipe (112).

3. The vacuum freeze-drying apparatus for pharmaceuticals according to claim 2, characterized in that, A vacuum pump (113) is installed on the inner wall of the fixed frame (1). The vacuum pump (113) is connected to the vacuum tank (101) through a connecting pipe (114). A guide rail (103) is installed on the top surface of the mounting frame (102). A sliding sleeve (105) is movably installed on the outer wall of the guide rail (103). The top surface of the sliding sleeve (105) is fixedly connected to the bottom surface of the placement frame (104).

4. The vacuum freeze-drying apparatus for pharmaceuticals according to claim 1, characterized in that, Two limiting strips (201) are fixedly installed on the inner wall of one end of the vacuum tank (101). A limiting sleeve (202) is slidably installed on the outer wall of each limiting strip (201). A moving strip (203) is fixedly installed on the side of the limiting sleeve (202). The side of the moving strip (203) is fixedly connected to one end of the connecting strip (208).

5. The vacuum freeze-drying apparatus for pharmaceuticals according to claim 4, characterized in that, A motor (204) is fixedly installed on the side of the vacuum tank (101). The output rod of the motor (204) rotates through the vacuum tank (101) and extends into the interior of the vacuum tank (101). A rotating bar (205) is fixedly installed on the outer wall of the output rod of the motor (204). A cylinder (206) is fixedly installed at one end of the rotating bar (205). A vertical groove (207) is provided on the side of the moving bar (203). The outer wall of the cylinder (206) is slidably connected to the inner wall of the vertical groove (207).

6. The vacuum freeze-drying apparatus for pharmaceuticals according to claim 5, characterized in that, A concave strip (212) is slidably installed on the inner wall of the through groove (209). Two fixed rods (214) are slidably installed through the concave strip (212). The two ends of the fixed rods (214) are fixedly connected to the inner wall of the through groove (209). An elastic element (215) is movably installed on the outer wall of the fixed rods (214). The two ends of the elastic element (215) are fixedly connected to the side of the concave strip (212) and the inner wall of the through groove (209).

7. A vacuum freeze-drying apparatus for pharmaceuticals according to claim 6, characterized in that, The concave strip (212) is provided with a through groove (213), the connecting strip (208) is provided with an arc groove (217), and the dispersing column (211) is provided with an adjusting rod (216). The outer wall of the adjusting rod (216) is slidably connected to the inner wall of the arc groove (217) and the inner wall of the strip groove (213).

8. A vacuum freeze-drying apparatus for pharmaceuticals according to claim 7, characterized in that, The bottom surface of the connecting strip (208) is provided with a groove (218). One end of the concave strip (212) is fixedly installed with a fixing strip (219). The other end of the fixing strip (219) slides through the through groove (209) and extends into the inside of the groove (218). The bottom surface of the fixing strip (219) is fixedly connected to the top surface of the adjusting column (220). The fixing plate (221) is provided with an adjusting groove (222). The middle of the adjusting groove (222) is set to a horizontal state, and the two ends are set to a corrugated shape. The outer wall of the adjusting column (220) is slidably connected to the inner wall of the adjusting groove (222).

9. A vacuum freeze-drying apparatus for pharmaceuticals according to claim 1, characterized in that, The arc-shaped strip (303) is connected by a connecting shaft (302), and the two ends of the connecting shaft (302) are rotatably connected to the inner wall of the connecting frame (301) through bearings.

10. A vacuum freeze-drying apparatus for pharmaceuticals according to claim 9, characterized in that, A torsion spring (305) is movably installed on the outer wall of the connecting shaft (302). One end of the torsion spring (305) is fixedly connected to the inner wall of the connecting frame (301), and the other end of the torsion spring (305) abuts against the bottom surface of the arc strip (303). The bottom surface of the adjusting column (220) is slidably connected to the top surface of the arc strip (303).

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