Sand mixer for casting
By using a dual mixing rack design and an adjustable protection device, the problems of uneven mixing and equipment damage in existing sand mixers have been solved, achieving an efficient and uniform sand mixing process and equipment protection, thereby improving casting quality and production efficiency.
Patent Information
- Application Number
- CN202422932754.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-11-29
AI Technical Summary
Existing sand mixers suffer from uneven mixing, easily damaged mixing racks, and insufficient flexibility of protective devices, which affect casting quality and production efficiency.
The design employs a dual mixing rack, with inclined plates and a rotating frame working together, along with adjustable protection devices and limiting mechanisms to ensure uniform mixing and equipment stability.
It improves the quality of sand mixing and the adaptability of equipment, prevents the mixing rack from breaking and the motor from overloading, and ensures production stability and efficiency.
Smart Images
Figure CN223465519U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sand casting technical field more specifically, it relates to a kind of sand mixer for casting. BACKGROUND
[0002] In the existing casting technology, sand mixer is the key equipment for preparing high-quality casting sand, however, there are some significant problems in the sand mixer on the market at present, these problems not only affect the quality of sand mixing, but also may lead to equipment damage and production efficiency reduction.
[0003] Firstly, the existing sand mixer mostly uses blade stirring method for sand mixing processing, this method usually uses only a single mixing frame for operation, this design has obvious limitations, in the mixing process, stable vortex is easily formed inside the mixing cylinder, this vortex effect can cause the mixed material to form fixed movement track in the cylinder, so that the material in some areas cannot be fully mixed, while other areas can be over-mixed, this uneven mixing state directly affects the quality of final casting sand, which can cause casting defects, such as porosity, sand inclusion and other problems, thereby reducing the overall quality and performance of casting.
[0004] Secondly, the connection part of motor output end and mixing frame in the prior art usually adopts simple structure design, this simple connection method is not stable enough when facing high-strength, long-time sand mixing operation, when the mixing frame encounters larger resistance, for example, when processing dry or clumped materials, the simple connection structure can not withstand the sudden increase of torque and stress, which can cause the mixing frame to break, and even cause motor overload damage in serious cases, although some equipment manufacturers try to solve this problem by increasing overload protection devices, but these protection devices are usually simple in structure and lack flexibility, they cannot adjust the protection triggering mechanism according to different working conditions and material characteristics, which leads to lack of adaptability of the equipment in actual use, for example, when processing materials with different viscosities, the fixed protection mechanism can trigger too early or fail to respond in time, affecting production efficiency or failing to provide effective protection.
[0005] In addition, in order to solve the above problems, some manufacturers begin to introduce adjustable protection mechanism in the equipment, which aims to realize flexible adjustment of protection device triggering mechanism to adapt to different working conditions, however, these adjustment mechanisms are usually designed too simply, lack of fine control ability, for example, these simple adjustment mechanisms are prone to looseness or wear after long-term use, causing the set triggering mechanism to drift or change, this instability can cause the protection device to trigger at inappropriate time, interfere with normal production, or fail to start in time when needed, unable to provide effective protection for the equipment. SUMMARY
[0006] (1) Technical problems solved
[0007] In view of the problems existing in the prior art, the utility model provides a sand mixer for casting to solve the technical problems mentioned in the background technology.
[0008] (2) Technical solution
[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sand mixing machine for casting, comprising a sand mixing barrel, characterized in that: a sand mixing device is provided on the sand mixing barrel, the sand mixing device comprises a driving wheel, a driven wheel, a mixing frame and a barrel cover, the barrel cover is detachably mounted on the sand mixing barrel, the mixing frame is rotatably arranged in the sand mixing barrel, the driven wheel is arranged above the barrel cover, the driving wheel is meshed with the driven wheel, a protective device is connected to the top of the mixing frame, the protective device comprises a matching rod, a matching sleeve, a spring, a slot, a screw, a movable block, a control sleeve, an adapter block and a clamping frame, the matching rod is connected Connected to the top of the mixing frame, the mating sleeve is arranged on the outside of the mating rod, the two ends of the spring are respectively connected to the adapter block and the movable block, the slot is opened on the outside of the mating rod, the movable block is movably connected with the screw rod through a thread, the adapter block is movably arranged on one side of the engagement frame, and a limiting mechanism is provided on the outside of the mating sleeve, the limiting mechanism includes a limiting sleeve, a connecting spring, a limiting rod and a limiting groove, the limiting sleeve is arranged on the outside of the control sleeve, one end of the limiting rod is connected to the outer wall of the control sleeve through a connecting spring, and the other end of the limiting rod is inserted into the limiting groove, and a plurality of the limiting grooves are opened on the outside of the mating sleeve.
[0010] The present invention is further configured such that a sliding groove is provided on the side wall of the matching sleeve, a slide plate is connected to the outer sides of the adapting block and the movable block, and the sliding groove is adapted to the slide plate.
[0011] The utility model is further configured such that a push spring is provided on the outside of the matching sleeve, one end of the push spring is connected to the limiting sleeve, and the other end of the push spring is connected to the matching sleeve.
[0012] The present invention is further configured such that an external gear is fixedly provided on the outer side of the screw, an internal gear is fixedly provided on the inner side of the control sleeve, and the external gear is meshed with the internal gear.
[0013] The utility model is further configured such that a first motor and a reducer are provided on the cylinder cover, the reducer input end is connected to the first motor output end, and the reducer output end is connected to one end of the driving wheel, and the above components provide a stable power source for the movement of the mixing rack.
[0014] The utility model further provides for, the inside fixedly arranged with the inclined plate of sand mixing barrel, the one side of inclined plate detachably arranged with drive motor, the other side of inclined plate rotatably arranged with rotating frame, drive motor output passes through inclined plate and rotating frame axle core connection, the setting of above -mentioned components realizes the sufficient mixing of bottom raw materials, improves product quality.
[0015] The utility model further provides for, the outside connection of sand mixing barrel is equipped with the unloading frame, the inside slide of unloading frame is equipped with baffle, the setting of above -mentioned components facilitates the unloading operation.
[0016] The utility model further provides for, the outside detachable of sand mixing barrel is equipped with hydraulic cylinder, hydraulic cylinder output end connection is equipped with hydraulic rod, the bottom end of hydraulic rod is connected with baffle top end, the setting of above -mentioned components provides stable power source for the movement of baffle.
[0017] (Three) beneficial effects
[0018] Compared with the prior art, the utility model provides a sand mixer for casting, has the following beneficial effects:
[0019] 1, the innovative design of sand mixing device effectively solves the stable vortex problem caused by single mixing frame, by setting two opposite rotating mixing frames in the sand mixing barrel, and cooperating with the design of inclined plate and rotating frame, the omnibearing mixing of raw materials is realized, this multidimensional stirring mode not only breaks the limitation of traditional single stirring mode, but also significantly improves the uniformity of mixing, the meshing transmission mechanism of driving wheel and driven wheel ensures the synchronous opposite movement of two mixing frames, further enhances the mixing effect, the introduction of inclined plate and rotating frame solves the problem of insufficient mixing of bottom raw materials, ensures the efficiency and uniformity of the whole sand mixing process, this design not only improves the sand mixing quality, but also increases the adaptability of equipment.
[0020] 2, the design of protection device cleverly solves the equipment damage problem that mixing frame may cause when encountering large resistance, through the cooperative work of cooperating rod, cooperating sleeve, spring, clamping groove and clamping frame etc. Assembly, the effective protection of mixing frame is realized, when mixing frame encounters excessive resistance, clamping frame will slide out of clamping groove, make cooperating sleeve idle, thereby avoiding the risk of mixing frame fracture and motor overload, at the same time, the design of movable block, screw rod and control sleeve allows the operator to adjust the trigger mechanism of protection device flexibly, this adjustable protection mechanism greatly improves the adaptability of equipment, can accurately adjust according to the characteristics of different raw materials and working conditions, ensures that the equipment can be effectively protected in various conditions.
[0021] 3、The introduction of the limiting mechanism further enhances the stability and reliability of the protection device, the combination design of the limiting sleeve, the connecting spring, the limiting rod and the limiting groove effectively prevents accidental changes of the adjusted trigger mechanism, when the adjustment is completed, the limiting rod is clamped into the limiting groove and is fixed by the limiting sleeve, this multiple locking mechanism ensures that the trigger mechanism remains stable during long-term use, the design of the push spring enables the limiting sleeve to automatically reset, improving the convenience of operation, this design not only solves the problem that the adjustment mechanism is prone to change in the prior art, but also improves the reliability and durability of the entire protection system. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model;
[0023] Figure 2 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model; Figure 1 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model;
[0024] Figure 3 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model;
[0025] Figure 4 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model;
[0026] Figure 5 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model; Figure 4 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model;
[0027] Figure 6 It is a schematic diagram of the overall structure of a sand mixer for casting in the utility model.
[0028] In the figure: 1, sand mixing drum; 2, driving wheel; 3, driven wheel; 4, mixing frame; 5, drum cover; 6, matching rod; 7, matching sleeve; 8, spring; 9, clamping groove; 10, screw rod; 11, movable block; 12, control sleeve; 13, adaptive block; 14, clamping frame; 15, limiting sleeve; 16, connecting spring; 17, limiting rod; 18, limiting groove; 19, sliding groove; 20, sliding plate; 21, push spring; 22, external gear; 23, internal gear; 24, first motor; 25, speed reducer; 26, inclined plate; 27, driving motor; 28, rotating frame; 29, discharging frame; 30, baffle; 31, hydraulic cylinder; 32, hydraulic rod. DETAILED DESCRIPTION
[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.
[0030] It should be noted that all technical and scientific terms used in the present application have the same meaning as that generally understood by those skilled in the art to which the present application belongs, unless otherwise specified.
[0031] In the present application, unless otherwise specified, the directions used such as "up, down" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions; similarly, for the convenience of understanding and description, "left, right" are generally directed to the left and right shown in the drawings; "inner, outer" refer to the inner and outer of the contour of each component itself, but the above directional words are not used to limit the present application.
[0032] Please refer to Figures 1-6 A sand mixer for casting, comprising a sand mixing barrel 1, characterized by: a sand mixing device is arranged on the sand mixing barrel 1, the sand mixing device comprises a driving wheel 2, a driven wheel 3, a mixing frame 4 and a barrel cover 5, the barrel cover 5 is detachably installed on the sand mixing barrel 1, the mixing frame 4 is rotationally arranged in the sand mixing barrel 1, the driven wheel 3 is arranged above the barrel cover 5, the driving wheel 2 is engaged with the driven wheel 3, a protection device is connected to the top end of the mixing frame 4, the protection device comprises a matching rod 6, a matching sleeve 7, a spring 8, a clamping groove 9, a screw rod 10, a movable block 11, a control sleeve 12, an adaptive block 13 and a clamping frame 14, the matching rod 6 is connected to the top end of the mixing frame 4, the matching sleeve 7 is sleeved outside the matching rod 6, the spring 8 is connected to the adaptive block 13 and the movable block 11 at both ends, the clamping groove 9 is arranged outside the matching rod 6, the movable block 11 is movably connected to the screw rod 10 through threads, the adaptive block 13 is movably arranged on one side of the clamping frame 14, a limiting mechanism is arranged outside the matching sleeve 7, the limiting mechanism comprises a limiting sleeve 15, a connecting spring 16, a limiting rod 17 and a limiting groove 18, the limiting sleeve 15 is sleeved outside the control sleeve 12, one end of the limiting rod 17 is connected to the outer wall of the control sleeve 12 through the connecting spring 16, the other end of the limiting rod 17 is inserted into the limiting groove 18, and a plurality of limiting grooves 18 are arranged outside the matching sleeve 7.
[0033] A sliding groove 19 is arranged in the side wall of the matching sleeve 7, a sliding plate 20 is arranged outside the adaptive block 13 and the movable block 11, and the sliding groove 19 is matched with the sliding plate 20.
[0034] A push spring 21 is arranged outside the matching sleeve 7, one end of the push spring 21 is connected to the limiting sleeve 15, and the other end of the push spring 21 is connected to the matching sleeve 7.
[0035] An external gear 22 is fixedly arranged outside the screw rod 10, an internal gear 23 is fixedly arranged inside the control sleeve 12, and the external gear 22 is engaged with the internal gear 23.
[0036] In this embodiment, when it is necessary to adjust the trigger mechanism of the protective device, first push the limiting sleeve 15, the limiting sleeve 15 slides along the matching sleeve 7, and at the same time the limiting sleeve 15 will squeeze the push spring 21 connected to one side, and then the limiting sleeve 15 will no longer limit the outside of the limiting rod 17, and then rotate the control sleeve 12, the control sleeve 12 drives the limiting rod 17 to move, due to the rounded structure design at the end of the limiting rod 17 and the edge of the limiting groove 18, then the side wall of the limiting groove 18 squeezes the end of the limiting rod 17, so that one end of the limiting rod 17 slides out of the limiting groove 18, and then The other end of the limiting rod 17 drives the connecting spring 16 to stretch. At the same time, the control sleeve 12 drives the inner inner gear 23 to rotate, and then the inner gear 23 drives the outer gears 22 meshing with it to rotate, and then the outer gear 22 drives the screw 10 to rotate. Since the slide 20 and the slide groove 19 limit the movable block 11, the movable block 11 drives the slide 20 to slide along the slide groove 19, and then the distance between the movable block 11 and the adapter block 13 changes, so that the force applied by the spring 8 to the adapter block 13 changes, so that the adapter block 13 The force applied to the snap-fit frame 14 changes, thereby achieving the purpose of adjusting the trigger mechanism of the protection device. After the adjustment is appropriate, the connecting spring 16 drives the limiting rod 17 to engage with the corresponding limiting groove 18, and then the limiting sleeve 15 is released, and the push spring 21 pushes the limiting sleeve 15 to reset, and then the inner wall of the limiting sleeve 15 limits the outer end of the limiting rod 17 to prevent the limiting rod 17 from moving, and then the limiting rod 17 and the limiting groove 18 cooperate to form a limit for the control sleeve 12 to prevent the control sleeve 12 from moving, thereby effectively ensuring the stability after adjustment and preventing loosening. When the resistance is greater than the trigger mechanism, the side wall of the card slot 9 squeezes the end of the card frame 14. Due to the rounded structure design at the edge of the card slot 9 and the end of the card frame 14, one end of the card frame 14 will gradually slide out of the card slot 9, and then the other end of the card frame 14 will squeeze the adapter block 13, so that the adapter block 13 drives the slide plate 20 connected to one side to move along the slide groove 19. At the same time, the adapter block 13 and the movable block 11 cooperate to squeeze the spring 8, and then the motor will drive the matching sleeve 7 to idle, thereby effectively preventing the mixing frame 4 from breaking or the first motor 24 from overloading.
[0037] See also Figures 1-3 As a further implementation method of the entire device: a first motor 24 and a reducer 25 are provided on the cylinder cover 5, the input end of the reducer 25 is connected to the output end of the first motor 24, and the output end of the reducer 25 is connected to one end of the driving wheel 2.
[0038] An inclined plate 26 is fixed inside the sand mixing drum 1. A drive motor 27 is detachably mounted on one side of the inclined plate 26. A rotating frame 28 is rotatably mounted on the other side of the inclined plate 26. The output end of the drive motor 27 passes through the inclined plate 26 and is connected to the axis of the rotating frame 28.
[0039] The outer side of the sand mixing barrel 1 is connected with a discharging frame 29, and the inner side of the discharging frame 29 is slidably provided with a baffle 30.
[0040] The outer side of the sand mixing barrel 1 is detachably provided with a hydraulic cylinder 31, and the output end of the hydraulic cylinder 31 is connected with a hydraulic rod 32, and the bottom end of the hydraulic rod 32 is connected with the top end of the baffle 30.
[0041] More specifically, when the device needs to be used, first open the barrel cover 5, then add raw materials to the sand mixing barrel 1, then reinstall the barrel cover 5 on the sand mixing barrel 1, then turn on the first motor 24, which drives the driving wheel 2 to rotate after being decelerated by the speed reducer 25, then the driving wheel 2 drives the two driven wheels 3 on both sides to rotate, then the driven wheels 3 drive the two mixing frames 4 to rotate in opposite directions through the cooperation of the matching sleeves 7 and the matching rods 6, thereby effectively avoiding the formation of stable vortexes in the sand mixing barrel 1. At the same time, turn on the drive motor 27 installed on one side of the inclined plate 26, then the drive motor 27 drives the rotating frame 28 to rotate, thereby realizing the full-range mixing of the raw materials and preventing the bottom raw materials from not being mixed in place. After mixing is completed, connect the subsequent conveying equipment to one side of the discharging frame 29, then simultaneously turn on the hydraulic cylinders 31, and the two hydraulic cylinders 31 drive the hydraulic rods 32 connected to the output end to rise, then the hydraulic rods 32 drive the baffle 30 to rise. Since the discharging frame 29 and the inclined plate 26 are both inclined in structure, the mixed raw materials will then pass through the inclined plate 26 to the inner side of the discharging frame 29, and then enter the external conveying equipment through the discharging frame 29. When the mixed raw materials in the sand mixing barrel 1 are completely discharged, the hydraulic cylinders 31 and the hydraulic rods 32 drive the baffle 30 to reset, then turn off the other devices.
[0042] In summary, when the trigger mechanism of the protection device needs to be adjusted, first push the limiting sleeve 15, the limiting sleeve 15 slides along the fitting sleeve 7, at the same time the limiting sleeve 15 will extrude the push spring 21 connected on one side, then the limiting sleeve 15 will no longer limit the outside of the limiting rod 17, then turn the control sleeve 12, the control sleeve 12 drives the limiting rod 17 to move, because of the round corner structure design at the end of the limiting rod 17 and the edge of the limiting groove 18, then the side wall of the limiting groove 18 extrudes the end of the limiting rod 17, so that one end of the limiting rod 17 slides out of the limiting groove 18, then the other end of the limiting rod 17 will drive the connecting spring 16 to stretch, at the same time the control sleeve 12 will drive the internal gear 23 on the inside to rotate, then the internal gear 23 will drive each external gear 22 meshing with it to rotate, then the external gear 22 will drive the screw rod 10 to rotate, because the sliding plate 20 and the sliding groove 19 limit the movement of the movable block 11, then the movable block 11 will drive the sliding plate 20 to slide along the sliding groove 19, then the distance between the movable block 11 and the adapter block 13 changes, so that the force exerted by the spring 8 on the adapter block 13 changes, so that the force exerted by the adapter block 13 on the clamping frame 14 changes, thereby achieving the purpose of adjusting the trigger mechanism of the protection device, after adjusting appropriately, the connecting spring 16 drives the limiting rod 17 to engage into the corresponding limiting groove 18, then release the limiting sleeve 15, the push spring 21 pushes the limiting sleeve 15 to reset, then the inner wall of the limiting sleeve 15 limits the outer end of the limiting rod 17, preventing the limiting rod 17 from moving, then the limiting rod 17 and the limiting groove 18 cooperate to limit the movement of the control sleeve 12, preventing the control sleeve 12 from moving, thereby effectively ensuring the stability of the adjustment, preventing loosening, when the mixing frame 4 encounters resistance greater than the trigger mechanism, the side wall of the clamping groove 9 extrudes the end of the clamping frame 14, because of the round corner structure design at the edge of the clamping groove 9 and the end of the clamping frame 14, then one end of the clamping frame 14 will gradually slide out of the clamping groove 9, then the other end of the clamping frame 14 will extrude the adapter block 13, so that the adapter block 13 drives the sliding plate 20 connected on one side to move along the sliding groove 19, at the same time the adapter block 13 and the movable block 11 cooperate to extrude the spring 8, then the motor will drive the fitting sleeve 7 to idle, thereby effectively preventing the mixing frame 4 from breaking or the first motor 24 from overloading.
[0043] When the device needs to be used, first open the barrel cover 5, then add raw materials into the sand mixing barrel 1, then reinstall the barrel cover 5 on the sand mixing barrel 1, then open the first motor 24, the first motor 24 drives the driving wheel 2 to rotate after the speed reduction of the speed reducer 25, then the driving wheel 2 drives the two driven wheels 3 on the two sides to rotate respectively, then the driven wheels 3 drive the two mixing frames 4 to rotate oppositely through the cooperation of the matching sleeves 7 and the matching rods 6, so that the stable vortex in the sand mixing barrel 1 is effectively avoided, at the same time, open the driving motor 27 installed on one side of the inclined plate 26, then the driving motor 27 drives the rotating frame 28 to rotate, so that the raw materials are mixed in all directions, the bottom raw materials are prevented from not being mixed in place, after the mixing is completed, the subsequent conveying equipment is connected to the side of the discharging frame 29, then the two hydraulic cylinders 31 are opened synchronously, the two hydraulic cylinders 31 drive the hydraulic rods 32 connected to the output ends to rise, then the hydraulic rods 32 drive the baffle 30 to rise, since the discharging frame 29 and the inclined plate 26 are designed in inclined structure, then the mixed raw materials enter the external conveying equipment through the inclined plate 26 and the discharging frame 29, when the mixed raw materials in the sand mixing barrel 1 are discharged, the hydraulic cylinders 31 and the hydraulic rods 32 drive the baffle 30 to reset, then other devices can be closed again.
[0044] In all the schemes mentioned above, the connection between the two components can be selected according to the actual situation, such as welding, bolt and nut cooperation connection, bolt or screw connection or other known connection mode, which will not be described one by one, in the above, whenever there is a fixed connection, welding is preferred, although the embodiments of the utility model have been shown and described, those skilled in the art can understand that the embodiments can be changed, modified, replaced and modified in various ways without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A molding sand mixer for casting, comprising a sand mixing drum (1), characterized in that: The sand mixing barrel (1) is provided with a sand mixing device, the sand mixing device comprises a driving wheel (2), a driven wheel (3), a mixing frame (4) and a barrel cover (5), the mixing frame (4) is arranged in the sand mixing barrel (1), the driven wheel (3) is arranged above the barrel cover (5), the driving wheel (2) is engaged with the driven wheel (3), the top end of the mixing frame (4) is connected with a protection device, the protection device comprises a matching rod (6), a matching sleeve (7), a spring (8), a clamping groove (9), a screw rod (10), a movable block (11), a control sleeve (12), an adaptive block (13) and a clamping frame (14), the matching sleeve (7) is sleeved outside the matching rod (6), the spring (8) is connected with the adaptive block (13) and the movable block (11) at both ends, the clamping groove (9) is arranged on the outside of the matching rod (6), the movable block (11) is connected with the screw rod (10) through threads, the adaptive block (13) is arranged on one side of the clamping frame (14), a limiting mechanism is arranged outside the matching sleeve (7), the limiting mechanism comprises a limiting sleeve (15), a connecting spring (16), a limiting rod (17) and a limiting groove (18), the limiting sleeve (15) is sleeved outside the control sleeve (12), one end of the limiting rod (17) is connected with the outer wall of the control sleeve (12) through the connecting spring (16), and a plurality of limiting grooves (18) are arranged outside the matching sleeve (7).
2. A molding sand mixer according to claim 1, characterized in that: A sliding groove (19) is arranged in the side wall of the matching sleeve (7), sliding plates (20) are arranged outside the adaptive block (13) and the movable block (11), and the sliding groove (19) is matched with the sliding plates (20).
3. A molding sand mixer according to claim 1, characterized in that: A push spring (21) is arranged outside the matching sleeve (7), one end of the push spring (21) is connected with the limiting sleeve (15), and the other end of the push spring (21) is connected with the matching sleeve (7).
4. A molding sand mixer according to claim 2, characterized in that: An external gear (22) is fixedly arranged outside the screw rod (10), an internal gear (23) is fixedly arranged inside the control sleeve (12), and the external gear (22) is engaged with the internal gear (23).
5. A molding sand mixer according to any one of claims 1 to 4, characterized in that: A first motor (24) and a speed reducer (25) are arranged on the barrel cover (5), the input end of the speed reducer (25) is connected with the output end of the first motor (24), and the output end of the speed reducer (25) is connected with one end of the driving wheel (2).
6. A molding sander as claimed in claim 5, wherein: A slope plate (26) is fixedly arranged inside the sand mixing barrel (1), a drive motor (27) is detachably arranged on one side of the slope plate (26), and a rotating frame (28) is rotatably arranged on the other side of the slope plate (26), the output end of the drive motor (27) penetrates through the slope plate (26) and is connected with the shaft of the rotating frame (28).
7. A molding sander as claimed in claim 6, characterized in that: A discharging frame (29) is connected outside the sand mixing barrel (1), and a baffle (30) is slidably arranged inside the discharging frame (29).
8. A molding sander as claimed in claim 7, characterized in that: A hydraulic cylinder (31) is detachably arranged outside the sand mixing barrel (1), a hydraulic rod (32) is connected to the output end of the hydraulic cylinder (31), and the bottom end of the hydraulic rod (32) is connected with the top end of the baffle (30).