High-precision dispersing sand mill

Abstract

The invention relates to the technical field of sand mills, and discloses a high-precision dispersing sand mill which comprises an inner rack disc, the inner rack disc is fixedly connected to the middle of the left side of a sand milling cylinder, a mounting cover is fixedly connected to the left side of the inner rack disc, a first motor is fixedly connected to the middle of the left side of the mounting cover, and a sun gear is fixedly connected to the driving end of the first motor. And the outer side of the sun gear is connected with evenly-distributed planetary gears in a meshed mode, the outer sides of the multiple planetary gears are connected with the inner side of the inner rack disc in a meshed mode, and the middles of the inner sides of the planetary gears are fixedly connected with connecting rods. Through cooperation of an inner rack disc, a mounting cover, a motor I, a sun gear, a planetary gear, a connecting rod, a stirring blade, a limiting rod and a limiting disc, the effect of uniformly stirring materials in the sanding barrel is achieved, different gears drive different stirring tools to stir, so that the mixing effect of the materials in the sanding barrel is improved, and the practicability of the sanding barrel is improved. And the grinding efficiency is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of sand mills, in particular to a high-fine dispersion sand mill. Background Art

[0002] A sand mill, also known as a bead mill, is a device used to finely grind and evenly disperse particulate materials. It is mainly used for wet grinding of chemical liquid products. A medium usually needs to be added when the sand mill is operating. Depending on the different materials, the commonly used media include zirconia beads, glass beads, zirconium silicate beads, etc. The grinding operation of the material is completed through the interaction between the medium and the material.

[0003] The sand mill needs to stir the materials inside during use. However, traditional equipment usually simply stirs the materials during processing, which can easily lead to the phenomenon that the internal materials cannot be fully mixed, the grinding efficiency is low, and the grinding effect is not significant, which cannot achieve the uniform grinding effect required by the staff. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a high-fine dispersion sand mill, which solves the problem of uneven mixing of internal materials.

[0005] To achieve the above purpose, the present invention is implemented by the following technical scheme: a high-fine dispersion sand mill, comprising a bottom plate, a buffer mechanism is arranged at the top of the bottom plate, a mounting frame is arranged at the top of the buffer mechanism, a left and right opposite fixing seats are fixedly connected to the top of the mounting frame, a sand milling cylinder is fixedly connected to the top of the fixing seat, a stirring mechanism is arranged inside the sand milling cylinder, and a reinforcement mechanism is arranged at the bottom of the bottom plate;

[0006] The stirring mechanism includes an inner rack plate, which is fixedly connected to the middle left side of the sanding cylinder, a mounting cover is fixedly connected to the left side of the inner rack plate, a motor 1 is fixedly connected to the middle left side of the mounting cover, a sun gear is fixedly connected to the driving end of the motor 1, the outer side of the sun gear is meshed with evenly distributed planetary gears, a plurality of planetary gears are meshed with the inner side of the inner rack plate, a connecting rod is fixedly connected to the middle inner side of the planetary gears, the outer side of the connecting rod is fixedly connected with evenly distributed stirring blades, a plurality of stirring blades are fixedly connected with cleaning scrapers, a limiting rod is fixedly connected to the right end of the inner wall of the sanding cylinder, a limiting disk is fixedly connected to the left side of the limiting rod, and the limiting disk is located between the plurality of connecting rods.

[0007] Preferably, a feed hopper is arranged on the left side of the top of the sand mill cylinder, and a discharge pipe is fixedly connected to the bottom right end of the sand mill cylinder, and the discharge pipe is arranged through the right end of the inner wall of the mounting frame.

[0008] Preferably, the buffer mechanism comprises a plurality of guide cylinders, which are all fixedly connected to the top of the bottom plate, a guide groove is provided in the middle of the inner wall of the guide cylinder, a buffer slider is slidably connected inside the guide groove, and a rubber part is provided on the outer side of the buffer slider.

[0009] Preferably, the top end of the buffer sliding block is fixedly connected to a guide rod, the top end of the guide rod is fixedly connected to a support plate, and the top end of the support plate is fixedly connected to the bottom end of the mounting frame.

[0010] Preferably, a buffer spring is sleeved on the outer side of the guide cylinder, the bottom end of the buffer spring is fixedly connected to the top end of the base plate, and the top end of the buffer spring is fixedly connected to the bottom end of the support plate.

[0011] Preferably, the reinforcement mechanism includes a storage box, which is fixedly connected to the bottom end of the base plate, the bottom end of the inner wall of the storage box is fixedly connected with front and rear opposing support seats, the bottom end of the inner wall of the storage box is fixedly connected with evenly distributed positioning frames, and the top ends of multiple positioning frames are fixedly connected to the bottom end of the base plate.

[0012] Preferably, a second motor is fixedly connected to the middle of the bottom end of the base plate, a worm is fixedly connected to the driving end of the second motor, the outer side of the worm is meshingly connected to left and right opposite worm wheels, and a transmission rod is fixedly connected to the middle of the inner wall of the worm wheel.

[0013] Preferably, the transmission rod is rotatably connected to the inner wall of the support seat, and the outer side of the transmission rod is fixedly connected with front and rear opposite telescopic rods.

[0014] Preferably, the telescopic end of the telescopic rod is fixedly connected to a hinge frame, and one side of the hinge frame is fixedly connected to a positioning plate.

[0015] Preferably, the positioning plate is slidably connected inside the positioning frame, and a universal wheel is fixedly connected to the bottom end of the positioning plate.

[0016] Working principle: First, push the sand grinder to the appropriate position, start motor 2, and drive the worm to rotate through motor 2, and then drive the worm wheel to rotate, and the worm wheel rotates to drive the transmission rod to rotate, and support and limit it through the support seat, so as to further improve the stability of the transmission rod during the rotation process, and drive the telescopic rod to rotate through the rotation of the transmission rod, and the telescopic rod drives the articulated frame to move upward through its own extension and contraction during the rotation process, and further drives the positioning plate to slide upward inside the positioning frame, and the positioning plate can be limited by the positioning frame to prevent the positioning plate from deviating during the movement, so as to further improve its stability during movement, and drive the universal wheel to move through the movement of the positioning plate, and then drive the universal wheel to move. The wheel is retracted into the interior of the positioning frame, and is further connected and reinforced with the contact surface through a storage box, thereby increasing the contact area and friction with the contact surface, making the overall structure of the sand mill more stable, and the material to be ground is poured into the sand mill cylinder from the feed hopper, and the motor is started. The sun gear is driven to rotate by the rotation of the motor. Since the inner rack plate is fixed, the rotation of the sun gear can drive multiple planetary gears to rotate around the inner rack plate, and the rotation of the planetary gears can drive the connecting rod to rotate. The connecting rod can be limited by the limit plate during the rotation process, thereby avoiding the deviation of the connecting rod during the rotation process, and the limit plate can block the internal material to a certain extent to prevent the material from entering the inner The inside of the rack plate causes the inner rack plate to be blocked, and the connecting rod rotates to drive the stirring blade to rotate, thereby stirring the material inside the sand mill, and different gears drive different stirring tools to operate, thereby improving the mixing effect of the internal materials and further improving the grinding efficiency. The cleaning scraper is driven to rotate by the rotation of the stirring blade. At the same time, the cleaning scraper fits the inner wall of the sand mill, so the inner wall of the sand mill can be cleaned by the rotation of the cleaning scraper, further improving the practicality of the sand mill. During the stirring process, the sand mill generates a certain amplitude of vibration, which is transmitted to the mounting frame through the fixed seat, and further transmitted to the support plate. At this time, the support plate moves downward due to the vibration, thereby driving the guide rod to move. The guide rod drives the buffer slider to slide in the guide groove during the movement, and the buffer spring contracts due to the pressure from the support plate. After contracting to a certain extent, the buffer spring rebounds by its own elastic force, further driving the support plate to reset. Since the rubber part is provided on the outside of the buffer slider, the friction between the buffer slider and the guide groove can be increased, thereby reducing the sliding speed of the buffer slider, and further slowing down the reset speed of the buffer spring, which can have a buffering effect on the sanding barrel, thereby achieving a buffering effect on the sanding mill, and can effectively reduce the vibration and friction generated by the sanding mill during operation, thereby further improving the service life of the sanding mill. After use, start the motor 2 again, and drive the universal wheel to extend again by reversing the motor 2.Then the sand mill can be pushed to move to a suitable position for next use.

[0017] The present invention provides a high-precision dispersion sand mill. It has the following beneficial effects:

[0018] 1. The present invention realizes the effect of uniformly stirring the materials inside the sand mill barrel through the cooperation of the inner rack plate, the mounting cover, the motor 1, the sun gear, the planetary gear, the connecting rod, the stirring blade, the limit rod and the limit plate. Different gears drive different stirring tools for stirring, thereby improving the mixing effect of the internal materials and further improving the grinding efficiency. In the stirring process, the inner wall of the sand mill barrel can be cleaned by the cleaning scraper, thereby preventing the materials from adhering to the inner wall of the sand mill barrel and being difficult to remove, thereby further improving the practicality of the sand mill.

[0019] 2. The present invention achieves a reinforcement effect on the bottom of the device through the cooperation of a storage box, a second motor, a worm, a worm wheel, a transmission rod, a support seat, a telescopic rod, a hinged frame, a positioning plate, a positioning frame and a universal wheel. During use, the second motor can be operated to drive the universal wheel to retract into the positioning frame, and then the storage box and the contact surface are connected and reinforced, thereby increasing the contact area and friction with the contact surface, making the overall structure more stable.

[0020] 3. The present invention achieves a buffering effect on the sand mill through the cooperation of the guide cylinder, the guide groove, the buffer slider, the guide rod, the support plate and the buffer spring, which can effectively reduce the vibration and friction generated by the sand mill during operation, thereby further improving the service life of the sand mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an isometric stereoscopic schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the sand mill cylinder of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner rack plate of the present invention;

[0024] Figure 4 It is a schematic diagram of the internal structure of the guide cylinder of the present invention;

[0025] Figure 5 It is a schematic diagram of the internal structure of the storage box of the present invention;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the positioning frame of the present invention;

[0027] Figure 7 It is a schematic diagram of the internal structure of the positioning frame of the present invention.

[0028] Among them, 1. bottom plate; 2. buffer mechanism; 201. guide cylinder; 202. guide groove; 203. buffer slider; 204. guide rod; 205. support plate; 206. buffer spring; 3. mounting frame; 4. sanding cylinder; 5. fixing seat; 6. stirring mechanism; 601. inner rack plate; 602. mounting cover; 603. motor 1; 604. sun gear; 605. planetary gear; 606. connecting rod; 607, stirring blade; 608, cleaning scraper; 609, limit rod; 610, limit plate; 611, feed hopper; 612, discharge pipe; 7, reinforcement mechanism; 701, storage box; 702, motor 2; 703, worm; 704, worm wheel; 705, transmission rod; 706, support seat; 707, telescopic rod; 708, articulated frame; 709, positioning plate; 710, positioning frame; 711, universal wheel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example:

[0031] Please see attached Figure 1 - Attachment Figure 3 The embodiment of the present invention provides a high-fine dispersion sand mill, including a bottom plate 1, a buffer mechanism 2 is arranged at the top of the bottom plate 1, and the buffer mechanism 2 can effectively reduce the vibration and impact force generated by the sand mill during operation, thereby further improving the service life of the sand mill, a mounting frame 3 is arranged at the top of the buffer mechanism 2, and the top of the mounting frame 3 is fixedly connected with a fixed seat 5 opposite to the left and right, and the mounting frame 3 plays a fixed supporting role for the fixed seat 5, and the top of the fixed seat 5 is fixedly connected with a sand mill cylinder 4, in order to further improve the stability of the sand mill cylinder 4, and a stirring mechanism 6 is arranged inside the sand mill cylinder 4, and the stirring mechanism 6 can be used to uniformly stir the material inside the sand mill cylinder 4, thereby further improving the grinding efficiency, and a reinforcement mechanism 7 is arranged at the bottom end of the bottom plate 1, and the reinforcement mechanism 7 can further improve the stability of the bottom of the sand mill;

[0032] The stirring mechanism 6 includes an inner rack plate 601, which is fixedly connected to the middle part of the left side of the sanding tube 4. The sanding tube 4 fixes the inner rack plate 601. A mounting cover 602 is fixedly connected to the left side of the inner rack plate 601. The inner rack plate 601 fixes the mounting cover 602. A motor 1 603 is fixedly connected to the middle part of the left side of the mounting cover 602 in order to further improve the stability of the motor 1 603 and prevent the motor 1 603 from being offset. The driving end of the motor 1 603 is fixedly connected to a sun gear 604, which can be driven by the motor 1 603 to rotate. The outer side of 604 is meshed with evenly distributed planetary gears 605, and the outer sides of multiple planetary gears 605 are meshed with the inner side of the inner rack plate 601. The sun gear 604 rotates to drive the multiple planetary gears 605 to rotate around the inner rack plate 601. A connecting rod 606 is fixedly connected to the middle part of the inner side of the planetary gear 605. The planetary gear 605 fixes the connecting rod 606, and the connecting rod 606 is driven to rotate by the rotation of the planetary gear 605. The outer side of the connecting rod 606 is fixedly connected with evenly distributed stirring blades 607, and the connecting rod 606 drives the stirring during the rotation process. The blades 607 rotate to stir the material inside the sand mill 4, and different gears drive different stirring tools to operate, thereby improving the mixing effect of the internal materials and further improving the grinding efficiency. A cleaning scraper 608 is fixedly connected to the outer side of the multiple stirring blades 607. The stirring blades 607 fix the cleaning scraper 608, and the cleaning scraper 608 is driven to rotate by the rotation of the stirring blades 607. At the same time, the cleaning scraper 608 fits the inner wall of the sand mill 4, so the inner wall of the sand mill 4 can be cleaned by the rotation of the cleaning scraper 608, further improving the sand mill. In terms of practicality, the right end of the inner wall of the sanding cylinder 4 is fixedly connected to a limiting rod 609, which fixes the limiting rod 609. The left side of the limiting rod 609 is fixedly connected to a limiting disk 610, which fixes the limiting rod 609. The limiting disk 610 is located between multiple connecting rods 606. The connecting rod 606 can be limited by the limiting disk 610 to prevent the connecting rod 606 from deviating during rotation. The internal material can be blocked to a certain extent by the limiting disk 610 to prevent the material from entering the inner rack disk 601, thereby causing blockage of the inner rack disk 601.

[0033] For further information, please see the attached Figure 1 With attached Figure 2 A feed hopper 611 is provided on the left side of the top of the sand mill 4, and materials can be added to the sand mill 4 through the feed hopper 611. A discharge pipe 612 is fixedly connected to the bottom right end of the sand mill 4, and the materials after stirring and grinding can be discharged through the discharge pipe 612. The discharge pipe 612 is arranged through the right end of the inner wall of the mounting frame 3.

[0034] For further information, please see the attached Figure 1 With attached Figure 4 The buffer mechanism 2 includes a plurality of guide cylinders 201, which are fixedly connected to the top of the bottom plate 1. The bottom plate 1 plays a role of fixed support for the guide cylinders 201. A guide groove 202 is opened in the middle of the inner wall of the guide cylinder 201. A buffer slider 203 is slidably connected inside the guide groove 202. A rubber part is arranged on the outer side of the buffer slider 203 to increase the friction between the buffer slider 203 and the guide groove 202, and further reduce the sliding speed of the buffer slider 203.

[0035] For further information, please see the attached Figure 1 With attached Figure 4 The top of the buffer slider 203 is fixedly connected to a guide rod 204, and the buffer slider 203 fixes the guide rod 204. The top of the guide rod 204 is fixedly connected to a support plate 205, and the guide rod 204 provides a fixed support for the support plate 205. The top of the support plate 205 is fixedly connected to the bottom end of the mounting frame 3, and the support plate 205 provides a fixed support for the mounting frame 3.

[0036] For further information, please see the attached Figure 1 A buffer spring 206 is sleeved on the outer side of the guide cylinder 201, and the bottom end of the buffer spring 206 is fixedly connected to the top of the base plate 1, and the top end of the buffer spring 206 is fixedly connected to the bottom end of the support plate 205, in order to further improve the stability of the buffer spring 206 and prevent the buffer spring 206 from deflecting.

[0037] For further information, please see the attached Figure 5 The reinforcement mechanism 7 includes a storage box 701, which is fixedly connected to the bottom end of the base plate 1. The storage box 701 provides a fixed support for the base plate 1. The bottom end of the inner wall of the storage box 701 is fixedly connected with front and rear opposing support seats 706. The storage box 701 provides a fixed support for the support seats 706. The bottom end of the inner wall of the storage box 701 is fixedly connected with evenly distributed positioning frames 710. The top ends of the multiple positioning frames 710 are fixedly connected to the bottom end of the base plate 1 in order to further enhance the stability of the positioning frames 710 and prevent the positioning frames 710 from being offset.

[0038] For further information, please see the attached Figure 5 With attached Figure 6A motor 2 702 is fixedly connected to the middle part of the bottom end of the bottom plate 1 in order to further improve the stability of the motor 2 702 and make the motor 2 702 more stable during operation. A worm 703 is fixedly connected to the driving end of the motor 2 702, and the worm 703 can be driven to rotate by the motor 2 702. The outer side of the worm 703 is meshingly connected with left and right opposite worm wheels 704, which further drives the worm wheel 704 to rotate. A transmission rod 705 is fixedly connected to the middle part of the inner wall of the worm wheel 704. The worm wheel 704 fixes the transmission rod 705, and the rotation of the worm wheel 704 drives the transmission rod 705 to rotate.

[0039] For further information, please see the attached Figure 5 With attached Figure 6 The transmission rod 705 is rotatably connected to the inner wall of the support seat 706, and the support seat 706 can provide support for the transmission rod 705, thereby further improving the stability of the transmission rod 705 during the rotation process. The outer side of the transmission rod 705 is fixedly connected with front and rear opposite telescopic rods 707. The rotation of the transmission rod 705 drives the telescopic rod 707 to rotate, and the telescopic rod 707 can be extended and retracted to a certain extent during the rotation process.

[0040] For further information, please see the attached Figure 6 The telescopic end of the telescopic rod 707 is fixedly connected to the articulated frame 708, and the telescopic rod 707 plays a fixing role on the articulated frame 708. At the same time, the telescopic rod 707 drives the articulated frame 708 to move up and down through its own extension and contraction during the rotation process. A positioning plate 709 is fixedly connected to one side of the articulated frame 708, and the articulated frame 708 plays a fixing role on the positioning plate 709.

[0041] For further information, please see the attached Figure 7 The positioning plate 709 is slidably connected to the inside of the positioning frame 710, and the positioning plate 709 is driven to slide inside the positioning frame 710 through the movement of the hinge frame 708, and the positioning plate 709 is limited by the positioning frame 710 to prevent the positioning plate 709 from deviating during the movement, thereby further improving its stability. The bottom end of the positioning plate 709 is fixedly connected with a universal wheel 711, and the positioning plate 709 fixes the universal wheel 711, and the movement of the positioning plate 709 drives the universal wheel 711 to move, so that it is retracted into the inside of the positioning frame 710, and then connected and reinforced with the contact surface through the storage box 701, thereby increasing the contact area and friction with the contact surface, making the overall structure more stable, and after use, the motor 2 702 can be operated again to make the universal wheel 711 extend, thereby pushing the sand grinder to move to a suitable position for the next use.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-fine dispersion sand mill, comprising a bottom plate (1), characterized in that: The top of the bottom plate (1) is provided with a buffer mechanism (2), the top of the buffer mechanism (2) is provided with a mounting frame (3), the top of the mounting frame (3) is fixedly connected to left and right opposite fixing seats (5), the top of the fixing seats (5) is fixedly connected to a sanding cylinder (4), the sanding cylinder (4) is provided with a stirring mechanism (6), and the bottom of the bottom plate (1) is provided with a reinforcement mechanism (7); The stirring mechanism (6) comprises an inner rack plate (601), the inner rack plate (601) is fixedly connected to the middle of the left side of the sanding cylinder (4), the left side of the inner rack plate (601) is fixedly connected to a mounting cover (602), the middle of the left side of the mounting cover (602) is fixedly connected to a motor 1 (603), the driving end of the motor 1 (603) is fixedly connected to a sun gear (604), the outer side of the sun gear (604) is meshedly connected to uniformly distributed planetary gears (605), and the outer sides of the plurality of planetary gears (605) are meshedly connected to Connected to the inner side of the inner rack disk (601), a connecting rod (606) is fixedly connected to the middle part of the inner side of the planetary gear (605), the outer side of the connecting rod (606) is fixedly connected to evenly distributed stirring blades (607), and the outer sides of the plurality of stirring blades (607) are fixedly connected to cleaning scrapers (608), the right end of the inner wall of the sanding cylinder (4) is fixedly connected to a limiting rod (609), the left side of the limiting rod (609) is fixedly connected to a limiting disk (610), and the limiting disk (610) is located between the plurality of connecting rods (606).

2. A high-fine dispersion sand mill according to claim 1, characterized in that: A feed hopper (611) is arranged on the left side of the top end of the sand mill cylinder (4), and a discharge pipe (612) is fixedly connected to the bottom end of the right side of the sand mill cylinder (4), and the discharge pipe (612) is arranged through the right end of the inner wall of the mounting frame (3).

3. A high-fine dispersion sand mill according to claim 1, characterized in that: The buffer mechanism (2) comprises a plurality of guide cylinders (201), each of which is fixedly connected to the top of the bottom plate (1), a guide groove (202) is provided in the middle of the inner wall of the guide cylinder (201), a buffer slider (203) is slidably connected inside the guide groove (202), and a rubber portion is provided on the outer side of the buffer slider (203).

4. A high-fine dispersion sand mill according to claim 3, characterized in that: The top end of the buffer sliding block (203) is fixedly connected to a guide rod (204), the top end of the guide rod (204) is fixedly connected to a support plate (205), and the top end of the support plate (205) is fixedly connected to the bottom end of the mounting frame (3).

5. A high-fine dispersion sand mill according to claim 3, characterized in that: A buffer spring (206) is sleeved on the outer side of the guide cylinder (201), the bottom end of the buffer spring (206) is fixedly connected to the top end of the bottom plate (1), and the top end of the buffer spring (206) is fixedly connected to the bottom end of the support plate (205).

6. A high-precision dispersion sand mill according to claim 1, characterized in that: The reinforcement mechanism (7) comprises a storage box (701), the storage box (701) being fixedly connected to the bottom end of the base plate (1), the bottom end of the inner wall of the storage box (701) being fixedly connected to front and rear opposing support seats (706), the bottom end of the inner wall of the storage box (701) being fixedly connected to evenly distributed positioning frames (710), and the top ends of a plurality of the positioning frames (710) being fixedly connected to the bottom end of the base plate (1).

7. A high-precision dispersion sand mill according to claim 1, characterized in that: A second motor (702) is fixedly connected to the middle of the bottom end of the base plate (1); a worm (703) is fixedly connected to the driving end of the second motor (702); the outer side of the worm (703) is meshingly connected to left and right opposite worm wheels (704); and a transmission rod (705) is fixedly connected to the middle of the inner wall of the worm wheel (704).

8. A high-precision dispersion sand mill according to claim 7, characterized in that: The transmission rod (705) is rotatably connected to the inner wall of the support seat (706), and the outer side of the transmission rod (705) is fixedly connected to a front and rear opposite telescopic rod (707).

9. A high-precision dispersion sand mill according to claim 8, characterized in that: The telescopic end of the telescopic rod (707) is fixedly connected to a hinge frame (708), and one side of the hinge frame (708) is fixedly connected to a positioning plate (709).

10. A high-precision dispersion sand mill according to claim 9, characterized in that: The positioning plate (709) is slidably connected inside the positioning frame (710), and a universal wheel (711) is fixedly connected to the bottom end of the positioning plate (709).

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