Cement mortar mixer

Abstract

The application relates to the technical field of experimental cement mixing equipment, and particularly discloses a cement mortar mixer. The cement mortar mixer comprises a vertical seat, a motor, a transmission assembly, a rotating shaft, a lifting seat, stirring blades, a nut, locking screws, a height-adjusting bearing and a pot cover. The motor is installed on the vertical seat. The motor is connected with the vertical rotating shaft through the transmission assembly. The lifting seat is connected with the rotating shaft through a vertical key groove. The lifting seat is provided with external threads. The nut is fitted on the outside of the lifting seat. The pot cover is fixed to the vertical seat. The outer ring of the height-adjusting bearing is fixed to the pot cover, and the nut is used for fixing the inner ring of the height-adjusting bearing. The stirring blades are fixed below the lifting seat and rotatably pass through the pot cover. When the nut is rotated, the lifting seat moves up and down on the rotating shaft, and the stirring blades move up and down along with the lifting seat, that is, the distance between the stirring blades and the bottom of the pot can be adjusted. If the stirring blades are worn, the height of the stirring blades can be adjusted, so that the gap between the stirring blades and the bottom of the pot is reduced, and the mortar at the bottom of the pot is fully stirred.

Description

Technical Field

[0001] This application relates to the technical field of experimental cement mixing equipment, specifically to a cement mortar mixer. Background Technology

[0002] Cement mortar mixers are specialized equipment used to prepare cement mortar specimens. Traditional cement mortar mixers have mixing blades fixed to the rotating shaft by welding or bolting, which has the following drawbacks: the distance between the blades and the bottom of the pot is not adjustable; the gap increases after the blades wear, resulting in insufficient mixing of the mortar at the bottom; high maintenance costs; poor adaptability: different viscosities of mortar require specific mixing heights, and the fixed mixing height structure cannot be flexibly adjusted; after the blades wear out, the entire rotating shaft or blade assembly needs to be replaced, resulting in long downtime. Utility Model Content

[0003] To address the above problems, this application proposes a cement mortar mixer and adopts the following technical solution.

[0004] A cement mortar mixer includes a stand, a motor, a transmission assembly, a rotating shaft, a lifting seat, a mixing blade, a nut, a locking screw, a height-adjusting bearing, and a pot lid. The motor is mounted on the stand. The motor is connected to the vertically oriented rotating shaft via the transmission assembly. The lifting seat and the rotating shaft are connected via a vertical keyway. The lifting seat has external threads. The nut is threadedly fitted onto the outside of the lifting seat. The pot lid is fixed to the stand. The outer ring of the height-adjusting bearing is fixed to the pot lid, and the nut is fixed to the inner ring of the height-adjusting bearing. The mixing blade is fixed below the lifting seat and rotatably passes through the pot lid. The locking screw is mounted on the side of the nut; tightening the locking screw allows the nut and the lifting seat to press against each other and rotate synchronously.

[0005] By adopting the above technical solution, rotating the nut allows the lifting seat to move up and down on the rotating shaft, and the stirring blade moves up and down with the lifting seat. That is, the distance between the stirring blade and the bottom of the pot is adjustable. If the stirring blade is worn, the height of the stirring blade can be adjusted, thereby reducing the gap between the stirring blade and the bottom of the pot and fully mixing the mortar at the bottom of the pot.

[0006] In a preferred embodiment of the cement mortar mixer, the nut has a threaded hole on its side wall, the locking screw has an external thread, and the locking screw is adapted to pass through the threaded hole and face the outer wall of the lifting seat.

[0007] By adopting the above technical solution, the locking screw is rotated to abut against the outer wall of the lifting seat. Since the locking screw and nut are threadedly connected, and the nut and the outer wall of the lifting seat are also threadedly connected, the front ends of the nut and the locking screw have friction with the outer wall of the lifting seat. Adjusting the tightness of the locking screw can adjust the magnitude of this friction. A larger friction can keep the nut stationary relative to the lifting seat, that is, it can be in a synchronous rotation state, so that the lifting seat and the stirring blade do not rise and fall when stirring.

[0008] In a preferred embodiment of the cement mortar mixer, the transmission assembly includes a mounting box, a vertical bevel gear, and a horizontal bevel gear. The mounting box is fixed to the support.

[0009] The motor is horizontally mounted on the stand. The vertical bevel gear is fixed to the end of the motor's output shaft. The upper section of the rotating shaft is rotatably mounted in place within the mounting box. The horizontal bevel gear is fixed to the upper section of the rotating shaft. The vertical bevel gear meshes with the horizontal bevel gear. The lower section of the rotating shaft is located below the mounting box.

[0010] By adopting the above technical solution, the motor drives the rotating shaft to rotate in order to perform the action of mixing cement mortar.

[0011] In a preferred embodiment of the cement mortar mixer, the lower section of the rotating shaft has a vertical key. The inner wall of the lifting seat has a vertical groove, into which the key is fitted, and the length of the key is less than the length of the groove.

[0012] By adopting the above technical solution, the lifting seat can move up and down relative to the rotating shaft, and the lifting seat can rotate synchronously relative to the rotating shaft.

[0013] In a preferred embodiment of the cement mortar mixer, the mixing blades include a central rod, multiple branches, multiple blades, and multiple bolts. The upper end of the central rod is fixed to the lifting base. The multiple branches are fixed to the periphery and lower end of the central rod. Each branch has a blade installed at its end, and the branches and blades are secured with bolts.

[0014] By adopting the above technical solution, if the blade is damaged, the blade can be disassembled and replaced with a new one, without having to replace the central rod and branches together, thus reducing maintenance costs.

[0015] In a preferred embodiment of the cement mortar mixer, the cement mortar mixer further includes a sand jar fixed to the stand. The sand jar is located above the pot lid, and the sand jar has a feed pipe extending downward through the pot lid.

[0016] By adopting the above technical solution, sand particles can be placed into the sand jar, making it convenient to add materials.

[0017] A preferred embodiment of the cement mortar mixer is that the cement mortar mixer further includes a support, a fulcrum component, a handle, and a pot body.

[0018] The stand has a vertical slide rail. The support is embedded in the slide rail and can move vertically along the slide rail. The support has an inner section located within the stand and an outer section located outside the stand. The fulcrum is fixed to the stand. The handle is rotatably connected to the fulcrum. Using the fulcrum as a fulcrum, rotating the handle can cause the inner section of the support to rise and fix in one position or fall and fix in another. The pot body is placed on the outer section of the support, located below the pot lid.

[0019] By adopting the above technical solution, the position of the pot body after it rises is fixed, and its position relative to the rotating shaft is fixed, making debugging simple and facilitating stirring operations.

[0020] A preferred embodiment of the cement mortar mixer is that the cement mortar mixer further includes a linkage, a wedge, a return spring, a pull rod, and a handle.

[0021] The linkage comprises a cylindrical sleeve, a connecting rod, and a ball. The connecting rod connects the outer wall of the cylindrical sleeve and the ball. The cylindrical sleeve is fitted over the inner section of the support. The handle is located below the inner section of the support. The upper surface of the handle has a groove arranged along the handle's axial direction. The ball is embedded in the groove and cannot disengage from it.

[0022] The support has a sliding hole. The wedge is installed in the sliding hole. The return spring is arranged axially along the sliding hole, connecting the bottom wall of the sliding hole and the rear end of the wedge. The pull rod is arranged axially along the sliding hole, with one end connected to the rear end of the wedge and the other end passing through the support and connected to the handle. The lower surface of the front end of the wedge has a slope. When the return spring is naturally extended, the slope is outside the sliding hole.

[0023] Using the fulcrum as a fulcrum, rotating the handle can cause the inner section of the support to rise and abut against the inclined surface, thereby pressing the wedge into the sliding hole. After the inner section of the support rises above the wedge, the wedge is rebounded out of the sliding hole by the return spring, thus supporting and fixing the inner section of the support.

[0024] Pulling the handle outward causes the wedge to retract into the sliding hole, and the outer section of the support descends to the bottom of the stand and stops.

[0025] By adopting the above technical solution, the pot body can be raised and lowered by manually operating the handle and lever.

[0026] In summary, the cement mortar mixer of this application has the following beneficial effects: Rotating the nut allows the lifting seat to move up and down on the rotating shaft, and the mixing blades move up and down with the lifting seat. The distance between the blades and the bottom of the pot is adjustable. As the gap increases due to blade wear, the height of the mixing blades can be adjusted to reduce the gap between the mixing blades and the bottom of the pot, thus ensuring thorough mixing of the mortar at the bottom. This height-adjustable blade adapts to the specific mixing height required for mortars of different viscosities. If a blade is damaged, it can be disassembled and replaced individually without replacing the central rod and branches, reducing maintenance costs. Attached Figure Description

[0027] Figure 1 This is a front view of a cement mortar mixer.

[0028] Figure 2 for Figure 1 A sectional view.

[0029] Figure 3 For along Figure 1 Left view of the BB line section.

[0030] Figure 4 for Figure 3 Enlarged view of region C.

[0031] Figure 5 for Figure 1 The back view.

[0032] Figure 6 for Figure 1 A three-dimensional image viewed from below.

[0033] Figure 7 for Figure 6 Enlarged view of region A.

[0034] Figure 8 for Figure 1 A 3D view hidden behind the pedestal.

[0035] Reference numerals: 1. Stand; 2. Motor; 3. Transmission assembly; 4. Shaft; 5. Lifting seat; 6. Stirring blade; 7. Nut; 8. Locking screw; 9. Height adjustment bearing; 10. Pot lid; 11. Sand pot; 12. Support; 13. Pivot point; 14. Handle; 15. Pot body; 16. Linkage component; 17. Wedge; 18. Return spring; 19. Pull rod; 20. Pull handle; 301. Mounting box; 302. Vertical bevel gear; 303. Horizontal bevel gear; 601. Center rod; 602. Branch; 603. Blade; 604. Bolt; 101. Slide rail; 161. Cylindrical sleeve; 162. Connecting rod; 163. Ball; 141. Slide groove; 102. Slide hole; 171. Inclined surface; 21. Lifting spring. Detailed Implementation

[0036] The technical solutions in the embodiments are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the following embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] like Figures 1-5 A cement mortar mixer includes a stand 1, a motor 2, a transmission assembly 3, a rotating shaft 4, a lifting seat 5, a mixing blade 6, a nut 7, a locking screw 8, a height adjustment bearing 9, a pot lid 10, a sand jar 11, a support 12, a fulcrum component 13, a handle 14, a pot body 15, a linkage component 16, a wedge block 17, a return spring 18, a pull rod 19, and a pull handle 20.

[0038] like Figure 1 The stand 1 has a fixed housing, and other components are directly or indirectly mounted on the stand 1.

[0039] like Figure 2 The transmission assembly 3 includes a mounting box 301, a vertical bevel gear 302, and a horizontal bevel gear 303. The mounting box 301 is fixed on the stand 1.

[0040] The horizontally positioned motor 2 has a horizontal output shaft. The stator of the motor 2 is fixed to the top of the support 1. The end of the horizontal output shaft is fixed to the vertical bevel gear 302, and the horizontal bevel gear 303 meshes with the vertical bevel gear 302. The upper section of the vertical rotating shaft 4 is located in the mounting box 301. The horizontal bevel gear 303 is fixed to the upper section of the rotating shaft 4. Both ends of the upper section of the rotating shaft 4 are rotatably connected to the mounting box 301 through bearings.

[0041] The lower outer wall of the rotating shaft 4 has a vertical key. The inner wall of the lifting seat 5 has a vertical groove, into which the key is inserted. The length of the key is less than the length of the groove, so that the lifting seat 5 can move up and down relative to the rotating shaft 4 and can rotate synchronously.

[0042] The lifting seat 5 is annular with external threads on its outer wall. The stirring blade 6 is fixed to the lower end of the lifting seat 5 to drive the stirring blade 6 to rise and fall.

[0043] Nut 7 has internal threads and fits properly over the lifting seat 5.

[0044] The pot lid 10 is fixed to the stand 1. The height adjustment bearing 9 is installed at the center of the upper surface of the pot lid 10. The height adjustment bearing 9 has an inner ring and an outer ring. The inner ring is fixedly connected to the lower end face of the nut 7, and the outer ring is fixed to the pot lid 10. Thus, rotating the nut 7 keeps the thread height unchanged, while pushing the lifting seat 5 to move up and down along the keyway, thereby driving the stirring blade 6 to move up and down.

[0045] During stirring, nut 7 needs to be fixed and rotate synchronously with lifting seat 5. Otherwise, the rotating lifting seat 5 will exert an upward driving force on nut 7, causing nut 7 and stirring blade 6 to move upward. Therefore, locking screw 8 is set to pass through the side wall of nut 7 and abut against lifting seat 5. The locking screw 8 and nut 7 are threaded together, which increases the friction between nut 7 and lifting seat 5, so that nut 7 and lifting seat 5 can rotate synchronously.

[0046] like Figure 2 The stirring blade 6 includes a central rod 601, multiple branches 602, multiple blades 603, and multiple bolts 604, for example, five branches 602, five blades 603, and five bolts 604. The upper end of the vertical central rod 601 is fixed to the lower end of the lifting seat 5. The central rod 601 rotatably passes through the pot lid 10, and a sealing ring can be provided at the passage to prevent mortar from entering the threaded pair above. Each branch 602 is rod-shaped and fixed to the periphery and lower end of the central rod 601. Each branch 602 has a recessed hole at its end away from the central rod 601. The blades 603 are structures where the end rod connects to the blade. The end rod of each blade 603 is inserted into a recessed hole, and the blade 603 is fixed to the branch 602 by bolts 604 passing laterally through the sidewall of the recessed hole and screwing into the end rod. The bolts 604 are quick-release bolts with handles, which are easy to turn by hand. After prolonged stirring, the blade 603 is easily damaged, while the branch 602 and the central rod 601 are not easily damaged. In this case, simply unscrew the bolt 604, remove the blade 603, and replace it with a new blade 603. There is no need to replace the branch 602 and the central rod 601.

[0047] The sand jar 11 is fixed to the top of the stand 1, and its lower end has a feed pipe that passes downward through the pot lid 10. The pot body 15 can be placed below the pot lid 10. Sand can be introduced into the sand jar 11 and enter the pot body 15 through the feed pipe, making it convenient to add sand.

[0048] The front side of the stand 1 has a vertical slide rail 101, and the support 12 is slidably connected to the slide rail 101. The support 12 has an inner section located within the stand 1 and an outer section located outside the stand 1. The inner section is generally a horizontal L-shaped rod, and the outer section is generally a vertical L-shaped support block. The pot body 15 is placed on the outer section of the support 12 and rises and falls with the support 12.

[0049] like Figure 5 The lifting support 12 is powered by manually rotating the handle 14. A fulcrum 13 provides the pivot point for rotating the handle 14. This fulcrum 13 is a horizontal round rod fixed to the side wall of the support 1. The outer end of the handle 14 is located on the outer side of the support 12, and the middle section of the handle 14 is rotatably connected to the fulcrum 13. The inner section of the handle 14 is connected to the lower side of the inner section of the support 12, specifically through a linkage 16, so that the handle 14 can always be connected to the inner section of the support 12 for convenient operation.

[0050] like Figure 6 and Figure 7 The linkage 16 comprises a cylindrical sleeve 161, a connecting rod 162, and a ball 163 connected in sequence. The cylindrical sleeve 161 is fitted over the inner section of the support 12. The connecting rod 162 is connected to the outer wall of the cylindrical sleeve 161 and the ball 163. A groove 141 is formed on the upper surface of the inner section of the handle 14 along the axial direction of the handle 14. The upper part of the groove 141 is constricted, and the ball 163 is embedded in the groove 141 and cannot detach from it, while the connecting rod 162 can pass through the groove 141. The above configuration allows the handle 14 to support the manufacturing process, the handle 14 to rotate relative to the inner section of the support 12, and the position of the inner section of the support 12 relative to the handle 14 to change, in order to adapt to the changes in the relative angle and relative position of the handle 14 and the inner section of the support 12 during the rotation of the handle 14. Furthermore, the handle 14 can always be mounted on the fulcrum 13 to fix the handle 14.

[0051] After lifting the support 12 using the handle 14, the support 12 must be fixed in place. The following structure is used to achieve this.

[0052] like Figure 3 and Figure 4 The stand 1 has a horizontal, straight sliding hole 102 on the other side opposite to the handle 14, and the wedge 17 is installed in the sliding hole 102. The two ends of the return spring 18 are fixed to the inner bottom wall of the sliding hole 102 and the rear end of the wedge 17, respectively, that is, the end of the wedge 17 facing the inner bottom wall of the sliding hole 102. When the return spring 18 is naturally extended, a part of the wedge 17 extends out of the sliding hole 102, and the bottom surface of the extended part is a slope 171, which is the highest point at the foremost end outside the hole. The inner section of the raised support 12 can push against the inclined surface 171 from bottom to top and continue to rise to press the wedge 17 into the sliding hole 102. After the inner section of the support 12 reaches the wedge 17, the wedge 17 pops out again, so that the inner section of the support 12 rests on the planar upper surface of the wedge 17 and is supported and fixed. At this time, the rising position of the outer pot body 15 is fixed, and the distance between the pot body 15 and the stirring blade 6 is fixed, so that the stirring operation can be easily carried out each time. If the lower end of the stirring blade 6 wears and the cement mortar at the bottom of the pot body 15 is not stirred properly, the nut 7 can be rotated to finely adjust the stirring blade 6 downward a certain distance so that the cement mortar at the bottom is stirred again.

[0053] After mixing, to lower the pot body 15, the wedge 17 needs to be removed. Therefore, the mixer has a pull rod 19, one end of which is fixed to the rear end of the wedge 17, and the other end freely protrudes from the side wall of the stand 1 to fix the handle 20. Pulling the handle 20 compresses the return spring 18, and the wedge 17 moves backward and retracts into the sliding hole 102, which can release the limiting effect on the inner section of the support 12. In specific use, the handle 14 can be turned first to slightly lift the inner section of the support 12, and then the handle 20 can be pulled to retract the wedge 17 into the sliding hole 102. The support 12 will then lower until the outer section rests on the bottom of the stand 1 and stops.

[0054] like Figure 8 To improve the smoothness and ease of lifting the support 12, a lifting spring 21 is also installed inside the support 1. The upper end of the vertically arranged lifting spring 21 is fixed to the inner top surface of the support 1, and the lower end is fixed to the inner section of the support 12. When the support 12 is not supporting the pot body 15, the support 12 can also naturally descend to the bottom of the support 1, at which time the lifting spring 21 is in a stretched state.

[0055] The above-mentioned cement mortar mixer, through the interconnected structure of the lifting seat 5, nut 7, and height-adjusting bearing 9, allows for adjustable height of the mixing blade 6 connected below the lifting seat 5, adapting to mortars of different densities. For example, lightweight insulating mortar requires a smaller gap between the blade 603 and the bottom of the pot. After the mixing blade 6 wears down, its height can be precisely adjusted to eliminate blind spots in the mixing process at the bottom of the pot, ensuring better mixing of the mortar at the bottom of the pot 15. The mixing blade 6 is composed of a central rod 601, branches 602, and blades 603 connected by bolts 604. Blades 603 are easily worn components, while the central rod 601 and branches 602 are less prone to wear. In other words, slight wear on the central rod 601 and branches 602 does not affect operation. When blades 603 become unusable due to significant wear, only blades 603 need to be replaced, eliminating the need for the central rod 601 and branches 602, reducing maintenance costs by more than 60%.

[0056] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cement mortar mixer, characterized in that, The components include a stand (1), a motor (2), a transmission assembly (3), a rotating shaft (4), a lifting seat (5), a stirring blade (6), a nut (7), a locking screw (8), a height adjustment bearing (9), and a pot lid (10). The motor (2) is mounted on the stand (1). The motor (2) is connected to the vertical rotating shaft (4) via the transmission assembly (3). The lifting seat (5) and the rotating shaft (4) are connected by a vertical keyway. The lifting seat (5) has external threads. The nut (7) is threadedly fitted onto the lifting seat. Outside the lowering seat (5); the pot lid (10) is fixed on the upright seat (1); the outer ring of the height adjustment bearing (9) is fixed on the pot lid (10), and the nut (7) is fixed on the inner ring of the height adjustment bearing (9); the stirring blade (6) is fixed below the lifting seat (5) and rotatably passes through the pot lid (10); the locking screw (8) is installed on the side of the nut (7), and tightening the locking screw (8) can make the nut (7) and the lifting seat (5) press against each other and rotate synchronously.

2. The cement mortar mixer according to claim 1, characterized in that, The nut (7) has a threaded hole on its side wall, and the locking screw (8) has an external thread. The locking screw (8) is adapted to pass through the threaded hole and faces the outer wall of the lifting seat (5).

3. The cement mortar mixer according to claim 1, characterized in that, The transmission assembly (3) includes a mounting box (301), a vertical bevel gear (302), and a horizontal bevel gear (303); the mounting box (301) is fixed to the stand (1); The motor (2) is horizontally mounted on the stand (1); the vertical bevel gear (302) is fixed at the end of the output shaft of the motor (2); the upper section of the rotating shaft (4) is rotatably mounted in the mounting box (301); the horizontal bevel gear (303) is fixed to the upper section of the rotating shaft (4); the vertical bevel gear (302) meshes with the horizontal bevel gear (303); the lower section of the rotating shaft (4) is located below the mounting box (301).

4. The cement mortar mixer according to claim 3, characterized in that, The lower section of the rotating shaft (4) has a vertical key; the inner wall of the lifting seat (5) has a vertical groove, and the key is adapted to be inserted into the groove, the length of the key being less than the length of the groove.

5. The cement mortar mixer according to claim 1, characterized in that, The stirring blade (6) includes a central rod (601), multiple branches (602), multiple blades (603), and multiple bolts (604); the upper end of the central rod (601) is fixed to the lifting seat (5); the multiple branches (602) are fixed to the periphery and lower end of the central rod (601); each branch (602) has a blade (603) installed at its end, and the branch (602) and the blade (603) are fixed by bolts (604).

6. The cement mortar mixer according to claim 1, characterized in that, The cement mortar mixer also includes a sand jar (11) fixed to the stand (1); the sand jar (11) is located above the pot cover (10), and the sand jar (11) has a feed pipe that passes downward through the pot cover (10).

7. The cement mortar mixer according to claim 1, characterized in that, The cement mortar mixer also includes a support (12), a fulcrum component (13), a handle (14), and a pot body (15). The stand (1) has a vertical slide rail (101); the support (12) is embedded in the slide rail (101) and can move vertically along the slide rail (101); the support (12) has an inner section located in the stand (1) and an outer section located outside the stand (1); the fulcrum (13) is fixed on the stand (1); the handle (14) is rotatably connected to the fulcrum (13); with the fulcrum (13) as the fulcrum, rotating the handle (14) can drive the inner section of the support (12) to rise and fix its position or fall and fix its position; the pot body (15) is placed on the outer section of the support (12) and is located below the pot lid (10).

8. The cement mortar mixer according to claim 7, characterized in that, The cement mortar mixer also includes a linkage (16), a wedge (17), a return spring (18), a pull rod (19), and a handle (20). The linkage (16) has a cylindrical sleeve (161), a connecting rod (162), and a ball (163); the connecting rod (162) is connected to the outer wall of the cylindrical sleeve (161) and the ball (163); the cylindrical sleeve (161) is fitted outside the inner section of the support (12); the handle (14) is located below the inner section of the support (12); the upper surface of the handle (14) has a groove (141) arranged along the axial direction of the handle (14); the ball (163) is embedded in the groove (141) and cannot be removed from the groove (141). The stand (1) has a sliding hole (102); the wedge (17) is installed in the sliding hole (102); the return spring (18) is arranged along the axial direction of the sliding hole (102), and the return spring (18) connects the bottom wall of the sliding hole (102) and the rear end of the wedge (17); the pull rod (19) is arranged along the axial direction of the sliding hole (102), one end of the pull rod (19) is connected to the rear end of the wedge (17), and the other end passes through the stand (1) and is connected to the handle (20); the lower surface of the front end of the wedge (17) has an inclined surface (171); when the return spring (18) is naturally extended, the inclined surface (171) is located outside the sliding hole (102); Using the fulcrum (13) as the fulcrum, rotating the handle (14) can drive the inner section of the support (12) to rise and abut against the inclined surface (171), thereby pressing the wedge (17) into the sliding hole (102). After the inner section of the support (12) rises above the wedge (17), the wedge (17) is rebounded out of the sliding hole (102) by the return spring (18) and supports and fixes the inner section of the support (12). Pulling the handle (20) outward causes the wedge (17) to retract into the sliding hole (102), and the outer section of the support (12) descends to the bottom of the stand (1) and stops.

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