Speed reducer and kneading apparatus

Abstract

This application discloses a speed reducer and a kneading device. The speed reducer includes a housing, an input shaft, a transmission mechanism, an output shaft, and an automatic reciprocating mechanism. The output shaft is slidably connected to the housing. The automatic reciprocating mechanism drives the output shaft to perform axial reciprocating motion. The automatic reciprocating mechanism includes an eccentric sleeve, a swing yoke, a cross yoke, and a connecting shaft. The eccentric sleeve is eccentrically mounted on the output shaft. The swing yoke is mounted on the outer periphery of the eccentric sleeve via bearings and has two outwardly extending, oppositely arranged swing shafts. The cross yoke is sleeved outside the swing yoke and includes a guide cylinder and a connecting shaft sleeve connected to each other. The guide cylinder is slidably connected to the two swing shafts respectively, and the connecting shaft sleeve extends outward and is perpendicular to the guide cylinder. The axis of the connecting shaft sleeve is spaced apart from the axis of the output shaft. One end of the connecting shaft is rotatably connected to the connecting shaft sleeve, and the other end of the connecting shaft is fixed to the housing. This application can realize axial rotation and axial reciprocating linear motion of the output shaft, which is safe and efficient.

Description

Technical Field

[0001] This invention relates to the field of speed reduction mechanism technology, and more particularly to a speed reducer and a kneading device. Background Technology

[0002] A kneading machine is an important piece of equipment in the production of carbon products. It consists of a pair of cooperating and rotating blades (usually Z-shaped) that generate strong shearing action to uniformly stir, mix, and knead semi-dry materials such as carbon and asphalt to form a dense, plastic paste. A reducer converts the high-speed, low-torque power output from the power source into low-speed, high-torque power to drive the main shaft of the kneading machine.

[0003] In relevant technical solutions, a speed reducer typically includes a housing, an input shaft, a transmission mechanism, and an output shaft. The input shaft connects to the output shaft of the power source. The transmission mechanism includes one or more transmission stages and an output gear. Each stage of the transmission structure includes a transmission shaft and a transmission gear. The output gear is mounted on the output shaft, which connects to the main shaft of the kneader blades. The power source outputs power to drive the input shaft to rotate. The input shaft transmits the power to the output shaft via the transmission mechanism. The output shaft drives the main shaft of the kneader blades to rotate axially, enabling the kneader to mix and process the materials inside.

[0004] In the above technical solution, the output shaft of the reducer only rotates axially, and the main shaft of the kneader blades can only rotate axially under the drive of the reducer. This results in low mixing efficiency, uneven mixing, and affects product stability, leading to high kneading processing costs. Summary of the Invention

[0005] To address at least one of the problems mentioned in the background art, embodiments of this application provide a speed reducer and a kneading device. By eccentrically installing an automatic reciprocating mechanism on the output shaft, a single power source can achieve dual drive for the axial rotation and axial linear reciprocating motion of the output shaft. The output shaft drives the blade main shaft of the kneading device to both rotate and reciprocate linearly. The mechanism is compact, simple to set up, safe and efficient, and ensures uniform kneading of various raw materials, enhances the stability of the kneaded products, improves the working efficiency of the kneading device, and saves kneading costs.

[0006] A first aspect of this application provides a speed reducer, including a housing, an input shaft, a transmission mechanism, an output shaft, and an automatic reciprocating mechanism. The input shaft drives the output shaft to rotate axially via the transmission mechanism, and the output shaft is slidably connected to the housing. The automatic reciprocating mechanism is disposed inside the housing and is used to drive the output shaft to perform axial reciprocating motion. The automatic reciprocating mechanism includes an eccentric sleeve, a swing yoke, a cross yoke, and a connecting shaft. The eccentric sleeve is eccentrically mounted on the output shaft, and the centerline of the eccentric sleeve is angled to the centerline of the output shaft. The swing yoke is mounted on the outer periphery of the eccentric sleeve via bearings, and the swing yoke has two outwardly extending, oppositely arranged swing shafts. The cross yoke is sleeved outside the swing yoke, and the cross yoke includes a guide cylinder and a connecting shaft sleeve connected to each other. The guide cylinder is slidably connected to the two swing shafts respectively, and the connecting shaft sleeve extends outward and is perpendicular to the guide cylinder. The axis of the connecting shaft sleeve is spaced apart from the axis of the output shaft. One end of the connecting shaft is rotatably connected to the connecting shaft sleeve, and the other end of the connecting shaft is fixed to the housing.

[0007] In one feasible implementation, the angle between the centerline of the eccentric sleeve and the centerline of the output shaft is 14°~18°.

[0008] In one feasible implementation, the eccentric sleeve is disposed near the shoulder of the output shaft, the eccentric sleeve includes two sub-eccentric sleeves, the two sub-eccentric sleeves are fixed by screws, and the sub-eccentric sleeve near the shoulder of the output shaft is fixedly connected to the output shaft by screws.

[0009] In one feasible implementation, the swing yoke forms a swing ring sleeve corresponding to the position where the bearing is installed. Port grooves are opened at the opposite ends of the two sub-eccentric sleeves. The bearing includes two sets of tapered roller bearings, which are respectively installed in the port grooves. The two ends of the inner wall of the swing ring sleeve are respectively fitted with tapered roller bearings. A ring platform is provided in the middle of the inner wall of the swing ring sleeve to separate and position the two tapered roller bearings.

[0010] In one feasible implementation, the guide cylinder includes a guide cylinder seat, a guide copper sleeve, and a cover plate. The guide cylinder seat surrounds the outer periphery of the first side of the swing shaft, and the cover plate is located on the second side of the swing shaft and press-fitted to the guide cylinder seat. The first side and the second side of the swing shaft are the opposite sides of the swing shaft corresponding to the output shaft. The guide copper sleeve is fitted and fixed in the inner hole formed by the guide cylinder seat and the cover plate and slides around the swing shaft. The guide cylinder seats of both guide cylinders are both surrounded on the same side of the swing shaft.

[0011] In one feasible implementation, two connecting bushings are provided, both of which extend horizontally and are symmetrically arranged on both sides below the output shaft. And / or, a sliding copper sleeve is installed in the inner hole of the connecting shaft sleeve, and the sliding copper sleeve is slidably connected to the connecting shaft.

[0012] In one feasible implementation, one end of the output shaft is located inside the chassis, and the other end of the output shaft extends outside the chassis. The two ends of the output shaft are slidably connected to the chassis via copper sleeves. A guide sleeve is fixedly connected to the outside of the chassis corresponding to the output shaft. The guide sleeve is coaxial with the output shaft, and the inner diameter of the guide sleeve is larger than the diameter of the output shaft.

[0013] In one feasible implementation, the transmission mechanism includes a primary transmission structure, a secondary transmission structure, and an output gear; The automatic reciprocating mechanism is located at one end near the output shaft extending out of the housing, and the output gear is fixedly installed at the other end of the output shaft by a shrink sleeve.

[0014] In one feasible implementation, the chassis is provided with at least one support plate, the support plate having a pre-set through hole corresponding to the output shaft and a support copper sleeve installed thereon, the support copper sleeve being slidably connected to the output shaft.

[0015] A second aspect of this application provides a kneading device, including a base, a blade main shaft, and the aforementioned reducer. The blade main shaft is slidably mounted on the base and connected to the output shaft of the reducer. The blade main shaft rotates and reciprocates axially under the drive of the reducer.

[0016] In summary, the output shaft of the reducer provided in this application is slidably connected to the housing, and an eccentric sleeve is eccentrically mounted on the output shaft. The swing yoke is mounted on the outer periphery of the eccentric sleeve through a bearing. A cross yoke is fitted over the swing yoke, and the swing yoke has an extended swing shaft. The swing shaft is slidably connected to the guide cylinder of the cross yoke. The connecting sleeve of the cross yoke is rotatably connected to the connecting shaft fixed to the housing. The guide cylinder is perpendicular to the connecting sleeve. When the transmission mechanism drives the output shaft to rotate, the swing yoke reciprocates with the rotation of the output shaft. The cross yoke reciprocates around the connecting shaft, and at the same time, the swing yoke and the cross yoke slide relative to each other. The distance between the swing sleeve of the cross yoke and the output shaft is set so that the swing yoke drives the output shaft to automatically reciprocate axially through the eccentric sleeve. This causes the blade main shaft of the kneading equipment to rotate and reciprocate linearly under the drive of the output shaft of the reducer. The reducer of this application has a compact structure, simple setup, and is safe and efficient. It does not require a separate axial drive mechanism and power source for the output shaft, which makes various raw materials kneaded evenly, enhances the stability of the kneaded product, improves the working efficiency of the kneading equipment, and saves kneading costs. The kneading equipment of this application includes the aforementioned reducer and has the same beneficial effects. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a speed reducer provided in an embodiment of this application; Figure 2 for Figure 1 CC view; Figure 3 A schematic diagram of the assembly of the output shaft and the swing yoke provided in an embodiment of this application; Figure 4 for Figure 1 AA view; Figure 5 for Figure 1 BB view; Figure 6 for Figure 1 DD-direction view; Figure 7 for Figure 1 EE view; Figure 8 This is an actual assembly drawing of the output shaft and the automatic reciprocating mechanism provided in the embodiments of this application.

[0019] Explanation of reference numerals in the attached figures: 101-Chassis; 102-Input shaft; 103-Output shaft; 104-Guide sleeve; 105-Support plate; 106-Support copper sleeve; 107-Support bearing housing; 200 - Transmission mechanism; 210 - Primary transmission structure; 211 - Primary gear; 212 - Primary drive shaft; 220 - Secondary transmission structure; 221 - Secondary gear; 222 - Secondary drive shaft; 230 - Output gear; 231 - Expansion sleeve; 300 - Automatic reciprocating mechanism; 310 - Eccentric sleeve; 311 - Sub-eccentric sleeve; 320 - Swing yoke; 321 - Swing shaft; 322 - Swing ring sleeve; 323 - Ring platform; 330 - Connecting shaft; 340 - Tapered roller bearing; 350 - Cross yoke; 351 - Guide cylinder; 3511 - Guide cylinder seat; 3512 - Guide copper sleeve; 3513 - Cover plate; 352 - Connecting shaft sleeve; 360 - Sliding copper sleeve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. It is worth noting that the embodiments described in the accompanying drawings are only some embodiments of this application, and not all embodiments. That is, the embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0021] The following will combine Figures 1-8 The speed reducer and mixing equipment provided in the embodiments of this application will be described.

[0022] This application provides a speed reducer, such as... Figures 1-3 and Figure 8 As shown, it includes a housing 101, an input shaft 102, a transmission mechanism 200, an output shaft 103, and an automatic reciprocating mechanism 300. The input shaft 102 drives the output shaft 103 to rotate axially via the transmission mechanism 200, and the output shaft 103 is slidably connected to the housing 101. The automatic reciprocating mechanism 300 is disposed inside the housing 101 and is used to drive the output shaft 103 to perform axial reciprocating motion.

[0023] The automatic reciprocating mechanism 300 includes an eccentric sleeve 310, a swing yoke 320, a cross yoke 350, and a connecting shaft 330. The eccentric sleeve 310 is eccentrically mounted on the output shaft 103, and the center line of the eccentric sleeve 310 is set at an angle to the center line of the output shaft 103. The swing yoke 320 is mounted on the outer periphery of the eccentric sleeve 310 through bearings, and the swing yoke 320 has two outwardly extending, oppositely arranged swing shafts 321. The cross yoke 350 is sleeved outside the swing yoke 320, and the cross yoke 350 includes a guide cylinder 351 and a connecting shaft sleeve 352 connected to each other. The guide cylinder 351 is slidably connected to the two swing shafts 321 respectively, and the connecting shaft sleeve 352 is outwardly arranged and perpendicular to the guide cylinder 351. The axis of the connecting shaft sleeve 352 is spaced from the axis of the output shaft 103. One end of the connecting shaft 330 is rotatably connected to the connecting shaft sleeve 352, and the other end of the connecting shaft 330 is fixedly connected to the housing 101.

[0024] The input shaft 102 is an integral gear shaft. One end of the input shaft 102 extends out of the housing 101 through a pre-set hole and is used to connect with the power source output shaft 103. The other end of the input shaft 102 is located inside the housing 101, and the input shaft 102 is rotatably connected to the housing 101 through a bearing.

[0025] The input shaft 102 is fixed with a bearing sleeve corresponding to the preset mounting hole of the housing 101. The cover and bearing sleeve are fixed to the housing 101 from the outside of the housing 101 with screws. The end face of the input shaft 102 located inside the housing 101 is provided with a cover.

[0026] The eccentric sleeve 310 is a ring sleeve that is eccentrically set between the inner hole axis and the center line. The eccentric sleeve 310 is fixed close to the shoulder of the output shaft 103.

[0027] The rotatable connection between the connecting bushing 352 and the connecting shaft 330 can be a bearing connection or a copper sleeve connection.

[0028] The transmission mechanism 200 can be a single-stage or multi-stage transmission method.

[0029] In this embodiment of the reducer, the output shaft 103 is slidably connected to the housing 101. An eccentric sleeve 310 is eccentrically mounted on the output shaft 103. A swing yoke 320 is mounted on the outer periphery of the eccentric sleeve 310 via bearings. A cross yoke 350 is sleeved on the swing yoke 320. The swing yoke 320 has an extended swing shaft 321, which is slidably connected to the guide sleeve 351 of the cross yoke 350. The connecting sleeve 352 of the cross yoke 350 is rotatably connected to the connecting shaft 330 fixed to the housing 101. The cylinder 351 is perpendicular to the connecting shaft sleeve 352. When the transmission mechanism 200 drives the output shaft 103 to rotate, the swing yoke 320 swings back and forth with the output shaft 103. The cross yoke 350 swings back and forth around the connecting shaft 330. At the same time, the swing yoke 320 and the cross yoke 350 slide back and forth relative to each other. The swing shaft 321 of the cross yoke 350 is spaced apart from the output shaft 103, so that the swing yoke 320 drives the output shaft 103 to automatically reciprocate axially through the eccentric sleeve 310.

[0030] The speed reducer in this embodiment enables the blade main shaft of the kneading equipment to rotate and reciprocate linearly under the drive of the output shaft 103 of the speed reducer. It has a compact structure, simple setup, and is safe and efficient. It does not require a separate axial drive mechanism and power source for the output shaft, which makes various raw materials kneaded evenly, enhances the stability of the kneaded products, improves the working efficiency of the kneading equipment, and saves kneading costs.

[0031] In one feasible implementation, such as Figure 2 As shown, the angle α between the centerline of the eccentric sleeve 310 and the centerline of the output shaft 103 is 14°~18°.

[0032] This configuration ensures that the axial reciprocating swing amplitude of the output shaft 103 is within a suitable range, enabling it to drive the blade main shaft of the mixing device to perform uniform and thorough mixing, while also ensuring the overall smooth operation of the reducer and improving operational safety.

[0033] In one feasible implementation, such as Figure 2 As shown, the eccentric sleeve 310 is located near the shoulder of the output shaft 103. The eccentric sleeve 310 includes two sub-eccentric sleeves 311, which are fixed by screws. The sub-eccentric sleeve 311 near the shoulder of the output shaft 103 is fixed to the output shaft 103 by screws.

[0034] The output shaft 103 is provided with a spline groove corresponding to the eccentric sleeve 310, and the inner hole of the eccentric sleeve 310 is provided with spline teeth. The output shaft 103 and the eccentric sleeve 310 are circumferentially positioned and connected by the spline.

[0035] The eccentric sleeve 310 is relatively fixed to the output shaft 103 and the swing yoke 320 respectively through positioning components. The positioning components can be positioning bushings, locking nuts, etc. installed on the output shaft 103, or port grooves on the sub-eccentric sleeve 311 and ring platform 323 in the swing yoke 320 as described below.

[0036] This configuration ensures a uniform load on the eccentric sleeve 310, preventing misalignment due to eccentric installation and improving operational stability.

[0037] In one feasible implementation, such as Figure 2 As shown, the swing yoke 320 forms a swing ring 322 corresponding to the position where the bearing is installed. The two eccentric sleeves 311 have port grooves at their opposite ends. The bearing includes two sets of tapered roller bearings 340, which are respectively installed in each port groove. The two ends of the inner wall of the swing ring 322 are respectively fitted with the tapered roller bearings 340. The middle part of the inner wall of the swing ring 322 is provided with a ring platform 323 to separate and position the two tapered roller bearings 340.

[0038] During installation, the tapered roller bearing 340 is first installed into the port slots of the two sub-eccentric sleeves 311, and then the sub-eccentric sleeve 311, the oscillating yoke 320, and the other sub-eccentric sleeve 311 are sequentially mounted on the output shaft 103 and positioned.

[0039] The tapered roller bearing 340 has good load performance and good self-aligning properties, especially meeting the load requirements of the eccentric sleeve 310 for eccentric installation.

[0040] The end face of the ring platform 323 inside the swing ring sleeve 322 and the end face of the port groove of the sub-eccentric sleeve 311 has a positioning function for the tapered roller bearing 340.

[0041] This design facilitates installation, improves operational stability, and reduces wear and vibration.

[0042] In one feasible implementation, such as Figure 2 and Figure 8As shown, the guide cylinder 351 includes a guide cylinder seat 3511, a guide copper sleeve 3512, and a cover plate 3513. The guide cylinder seat 3511 surrounds the outer periphery of the first side of the swing shaft 321. The cover plate 3513 is located on the second side of the swing shaft 321 and is press-fitted to the guide cylinder seat 3511. The first side and the second side of the swing shaft 321 are the opposite sides of the output shaft 103 corresponding to the swing shaft 321. The guide copper sleeve 3512 is fitted and fixed in the inner hole of the guide cylinder seat 3511 and the cover plate 3513 and slides around the swing shaft 321.

[0043] The guide cylinder seats 3511 of both guide cylinders 351 are both surrounded on the same side of the swing shaft 321.

[0044] With this configuration, the swing yoke 320 is fitted into the cross yoke 350 through the opening on the second side of the swing shaft 321 corresponding to the cross yoke 350, and then the cross yoke 350 and the swing yoke 320 are press-fitted together by the cover plate 3513. This configuration is easy to process and install, and the overall structure of the mechanism is compact.

[0045] In one feasible implementation, such as Figures 1-2 and Figure 7 As shown, there are two connecting bushings 352, both of which extend horizontally and are symmetrically arranged on both sides below the output shaft 103.

[0046] In one feasible implementation, a sliding copper sleeve 360 ​​is installed in the inner hole of the connecting bushing 352, and the sliding copper sleeve 360 ​​is slidably connected to the connecting shaft 330.

[0047] Since the connecting sleeve 352 and the guide cylinder 351 are vertically arranged, the cross yoke 350 swings in the vertical plane with the connecting sleeve 352 extending horizontally.

[0048] The two connecting shafts 330 are horizontally and symmetrically positioned to provide stable support for the output shaft 103.

[0049] This configuration ensures a uniform load on the output shaft 103, providing operational stability, and results in a compact overall structure that saves space.

[0050] In one feasible implementation, such as Figure 2 As shown, one end of the output shaft 103 is located inside the chassis 101, and the other end of the output shaft 103 extends outside the chassis 101. Both ends of the output shaft 103 are slidably connected to the chassis 101 through copper sleeves.

[0051] A guide sleeve 104 is fixedly connected to the outside of the chassis 101 corresponding to the output shaft 103. The guide sleeve 104 is coaxial with the output shaft 103, and the inner diameter of the guide sleeve 104 is larger than the diameter of the output shaft 103.

[0052] The outer end face of the guide sleeve 104 is fitted with an end cap; the copper sleeve installed on the end of the output shaft 103 away from the guide sleeve 104 is fitted with a dust cover.

[0053] This configuration ensures the stability of the output shaft 103 supported by the chassis 101, isolates external impurities to protect the normal operation of the output shaft 103, and extends the service life of the output shaft 103.

[0054] In one feasible implementation, such as Figures 1-2 and Figures 5-6 As shown, the transmission mechanism 200 includes a primary transmission structure 210, a secondary transmission structure 220, and an output gear 230.

[0055] The automatic reciprocating mechanism 300 is located at one end of the output shaft 103 that extends out of the housing 101, and the output gear 230 is fixedly installed at the other end of the output shaft 103 by means of a shrink sleeve 231.

[0056] The primary transmission structure 210 includes a primary transmission shaft 212 and a primary gear 211, while the secondary transmission structure 220 includes a secondary transmission shaft 222 and a secondary gear 212. This configuration ensures smooth transmission, reduces overall machine vibration, and improves operational stability.

[0057] In one feasible implementation, such as Figure 2 As shown, the chassis 101 is provided with at least one support plate 105. The support plate 105 is installed with a support copper sleeve 106 corresponding to the preset through hole of the output shaft 103. The support copper sleeve 106 is slidably connected to the output shaft 103.

[0058] Among them, a support bearing seat 107 is installed on the support plate 105, and a support copper sleeve 106 is assembled on the support bearing seat 107.

[0059] The support plate 105 can also provide support for the input shaft 102 and the various transmission structures of the transmission mechanism 200 through bearing connections.

[0060] This configuration further strengthens the support and protection of the output shaft 103 by the chassis 101, makes the internal space layout of the chassis 101 simple and reasonable, facilitates maintenance and repair, and improves the overall stability and safety of the device.

[0061] This application provides a kneading device, including a base, a blade main shaft, and the aforementioned reducer. The blade main shaft is slidably mounted on the base and is connected to the output shaft 103 of the reducer. The blade main shaft rotates and reciprocates axially under the drive of the reducer.

[0062] The blade spindle of the mixing device of this application is driven by the output shaft 103 of the aforementioned reducer, and has the same beneficial effects, which will not be described in detail here.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A speed reducer, characterized in that, The device includes a chassis, an input shaft, a transmission mechanism, an output shaft, and an automatic reciprocating mechanism. The input shaft drives the output shaft to rotate axially via the transmission mechanism, and the output shaft is slidably connected to the chassis. The automatic reciprocating mechanism is disposed inside the chassis and is used to drive the output shaft to perform axial reciprocating motion. The automatic reciprocating mechanism includes an eccentric sleeve, a swing yoke, a cross yoke, and a connecting shaft. The eccentric sleeve is eccentrically mounted on the output shaft, and the centerline of the eccentric sleeve is angled to the centerline of the output shaft. The swing yoke is mounted on the outer periphery of the eccentric sleeve via bearings, and the swing yoke has two outwardly extending, oppositely arranged swing shafts. The cross yoke is sleeved outside the swing yoke, and the cross yoke includes a guide cylinder and a connecting shaft sleeve connected to each other. The guide cylinder is slidably connected to the two swing shafts respectively, and the connecting shaft sleeve extends outward and is perpendicular to the guide cylinder. The axis of the connecting shaft sleeve is spaced apart from the axis of the output shaft. One end of the connecting shaft is rotatably connected to the connecting shaft sleeve, and the other end of the connecting shaft is fixed to the housing. The angle between the centerline of the eccentric sleeve and the centerline of the output shaft is 14°~18°; The eccentric sleeve is located near the shoulder of the output shaft. The eccentric sleeve includes two sub-eccentric sleeves, which are fixed by screws. The sub-eccentric sleeve near the shoulder of the output shaft is fixed to the output shaft by screws. The connecting bushing is provided in two parts, both of which extend horizontally and are symmetrically arranged on both sides below the output shaft. And / or, a sliding copper sleeve is installed in the inner hole of the connecting bushing, and the sliding copper sleeve is slidably connected to the connecting shaft; One end of the output shaft is located inside the chassis, and the other end of the output shaft extends outside the chassis. The two ends of the output shaft are slidably connected to the chassis via copper sleeves. A guide sleeve is fixedly connected to the outside of the chassis corresponding to the output shaft. The guide sleeve is coaxial with the output shaft, and the inner diameter of the guide sleeve is larger than the diameter of the output shaft.

2. The speed reducer according to claim 1, characterized in that, The swing yoke forms a swing ring sleeve corresponding to the position where the bearing is installed. Port grooves are opened at the opposite ends of the two sub-eccentric sleeves. The bearing includes two sets of tapered roller bearings, which are respectively installed in each of the port grooves. The two ends of the inner wall of the swing ring sleeve are respectively fitted with tapered roller bearings. A ring platform is provided in the middle of the inner wall of the swing ring sleeve to separate and position the two tapered roller bearings.

3. The speed reducer according to claim 2, characterized in that, The guide cylinder includes a guide cylinder seat, a guide copper sleeve, and a cover plate. The guide cylinder seat surrounds the outer periphery of the first side of the swing shaft. The cover plate is located on the second side of the swing shaft and is press-fitted to the guide cylinder seat. The first side and the second side of the swing shaft are the opposite sides of the swing shaft corresponding to the output shaft. The guide copper sleeve is fitted and fixed in the inner hole formed by the guide cylinder seat and the cover plate and slides around the swing shaft. The guide cylinder seats of both guide cylinders are both surrounded on the same side of the swing shaft.

4. The speed reducer according to claim 1, characterized in that, The transmission mechanism includes a primary transmission structure, a secondary transmission structure, and an output gear; The automatic reciprocating mechanism is located at one end near the output shaft extending out of the housing, and the output gear is fixedly installed at the other end of the output shaft by a shrink sleeve.

5. The speed reducer according to claim 1, characterized in that, The chassis is provided with at least one support plate, the support plate is fitted with a support copper sleeve corresponding to the preset through hole of the output shaft, and the support copper sleeve is slidably connected to the output shaft.

6. A mixing and kneading device, characterized in that, The device includes a base, a blade spindle, and a speed reducer as described in any one of claims 1 to 5. The blade spindle is slidably mounted on the base and connected to the output shaft of the speed reducer. The blade spindle rotates and reciprocates axially under the drive of the speed reducer.

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