1794results about "Gearing elements" patented technology

A feeder housing shaft sprocket segment comprising: a sprocket segment body (300) extending in a circumferential direction around a center axis (A) from a leading edge (304) to a trailing edge (306), wherein the leading edge (304) and trailing edge (306) subtend a segment angle about the center axis (A), the segment angle being a first unit fraction of 360°; an outer sprocket perimeter (308) comprising a plurality of teeth (310) evenly arranged in the circumferential direction about the center axis (A) with each tooth (310) spaced by a tooth angle from each adjacent tooth (310), the tooth angle being a second unit fraction of 360°; and a plurality of engagement surfaces (312) extending towards the center axis (A) and facing in the circumferential direction (C), the plurality of engagement surfaces (312) being asymmetrical relative to a plane (P) defined by the center axis (A) and a radial projection from the center axis (A) that bisects the sprocket segment body (300) midway between the leading edge (304) and the trailing edge (306).

Methods and apparatus for a composite bicycle front sprocket are disclosed herein. One embodiment discloses a composite bicycle front sprocket assembly having an outer assembly of a first material. The bicycle front sprocket assembly also has a center assembly of a second material. The center assembly is disposed at least partially within the outer assembly. The center assembly is irremovably coupled with the outer assembly. The center assembly is irremovably coupled with the outer assembly without an external fastening device to irremovably couple the center assembly with the outer assembly.

The utility model relates to the technical field of gear boxes, in particular to a gear box for a high-power ocean vessel. The gear box comprises a box body, a PTO shaft, a gear shaft, a clutch oil cylinder and an output shaft are rotationally installed in the box body, the PTO shaft is in transmission connection with the clutch oil cylinder, the clutch oil cylinder is connected with the gear shaft through a clutch, an output gear is arranged on the output shaft and comprises an outer gear ring and an installation disc, and the installation disc is detachably connected to the inner side of the outer gear ring. The outer gear ring is connected with the gear shaft in a meshed mode, and a plurality of weight reduction grooves are formed in the installation disc. During use, the clutch oil cylinder drives the gear shaft and the output shaft to rotate through the clutch to provide power for advancing of a ship. Meanwhile, the clutch oil cylinder drives the PTO shaft to rotate so as to drive an external generator to generate electricity. The split type design is adopted for the output gear, the weight reduction groove is formed in the installation disc, the high-power transmission requirement can be met, the overall weight of the output gear is lighter, and the output gear is easier to assemble and disassemble.

The high-strength flexible gear comprises a cylinder and a cylinder bottom flange, the cylinder comprises a gear ring section and a cylinder section, a fillet transition section is arranged between the cylinder section and the cylinder bottom flange, and a plurality of reinforcing ribs evenly distributed around the circle center of the cylinder section are arranged on the inner wall of the cylinder section. The reinforcing ribs extend to the position, corresponding to the tail end of the gear ring, of the inner wall of the barrel body from the fillet transition section so as to enhance the overall strength of the flexible gear, the rigidity of the inner wall of the barrel section of the flexible gear is remarkably improved through introduction of the reinforcing ribs, and the reinforcing ribs are arranged on the inner wall of the barrel section and extend to the position, corresponding to the tail end of the gear ring, of the inner wall of the barrel body from the fillet transition section. The reinforcing ribs are evenly distributed around the circle center of the cylinder section and extend to the position, corresponding to the tail end of the gear ring, of the inner wall of the cylinder body from the fillet transition section, a stable supporting network is formed, and assembly prestress generated when the wave generator is installed in a flexible gear is dispersed and reduced. Therefore, the risk of local plastic deformation or breakage of the flexible gear due to uneven stress is reduced.

To improve the strength of the screw threads. [Solution] The bicycle power transmission device comprises a first rotating body, a second rotating body, an elastic member, a stopper member, and a first nut. The first rotating body has a stopper surface facing in the circumferential direction. The second rotating body is arranged to be rotatable relative to the first rotating body. The elastic member elastically connects the first rotating body and the second rotating body. The stopper member is attached to the second rotating body. The stopper member has a stopper portion and a first threaded portion. The stopper portion faces the stopper surface in the circumferential direction. The first threaded portion is integrally formed with the stopper portion and extends in the axial direction. The first nut is screwed onto the first threaded portion.

A stator ring-internal gear assembly for a transmission device comprising a planetary gear of a wheel hub drive for a vehicle, the assembly may include a stator ring of an electrically operable electric motor device of the wheel hub drive for providing a motor torque and an internal gear of the transmission device for translating the provided motor torque into a net torque. The stator ring and the internal gear may be directly fixed to one another by positive connection in a non-rotatable and tension-resistant manner. The stator ring and the internal gear may form a mono-lithic unit.

The invention provides a combined flexible gear, a harmonic reducer and a robot, the combined flexible gear comprises a gear ring and a connecting flange, the gear ring comprises a flexible gear cylinder and flexible gear teeth formed on the cylinder wall of the outer side of the flexible gear cylinder, the connecting flange comprises a flange ring and a connecting cylinder located on the end face of one side of the flange ring, and the connecting cylinder is located on the end face of the other side of the flange ring. A first port of the connecting cylinder is in coaxial butt joint with a first port of the flexible gear cylinder, the gear ring and the connecting flange are made of different materials, and the connecting flange is made of high-toughness aluminum alloy materials. Fatigue tearing at the corner position of the connecting flange is avoided, so that the service life of the flexible gear is remarkably prolonged; the gear ring does not have a limiting obstacle of a connecting flange, cutters and clamps with general specifications can be selected in the machining process, and the cost of machining the cutters and the clamps is reduced; as the gear ring and the connecting flange are separately machined, the machining efficiency of the flexible gear can be improved, and the machining difficulty is reduced.

The utility model relates to the technical field of chain wheels, and discloses a fast-assembly positioning chain wheel which comprises a first fan-shaped chain wheel disc and a second fan-shaped chain wheel disc, the first fan-shaped chain wheel disc and the second fan-shaped chain wheel disc are attached to each other to form a complete chain wheel disc, and a plurality of chain teeth are arranged on the surfaces of the outer ends of the first fan-shaped chain wheel disc and the second fan-shaped chain wheel disc respectively. Connecting cylinders are attached to the centers of the surfaces of the first fan-shaped chain wheel disc and the second fan-shaped chain wheel disc respectively, sleeves are connected to the other ends of the connecting cylinders respectively, the connecting cylinders are stably connected with the chain wheel discs through fixing discs, fixing pins and nuts and accurately positioned, the stability of the chain wheel during high-speed rotation is ensured, faults caused by deviation of the connecting parts are avoided, and the service life of the chain wheel is prolonged. And meanwhile, the arc-shaped plate in the connecting cylinder can be flexibly adjusted through the rotating head and can be rapidly matched with sleeves of different sizes, the arc-shaped plate can be rapidly installed and stably run no matter in standard equipment or customized equipment, high universality is shown, and the equipment adaption cost is reduced.

The invention discloses a straight tooth extrusion wheel for internal spline inverted conical teeth and a machining method for the internal spline inverted conical teeth, and belongs to the technical field of mechanical product machining. The method comprises the following steps: broaching a to-be-processed workpiece to form an internal spline straight tooth structure; the straight tooth structure of the internal spline is subjected to inverted conical tooth extrusion machining, and metal allowance generated by extrusion deformation synchronously flows to the tooth side area and the small-diameter area of the internal spline; a straight tooth extrusion tool matched with an inverted conical tooth extrusion tool is adopted, secondary extrusion machining is conducted on the straight tooth area of the internal spline, and metal allowance flowing to the tooth side area of the internal spline is completely transferred to the small-diameter area; and the small-diameter area of the internal spline is machined, a bulge structure formed by the transferred metal allowance is removed, and machining of the reverse taper teeth of the internal spline is completed. Secondary gear burnishing is used, the small-diameter allowance is removed through follow-up machining, and the problem that the machining cost of an original internal spline reverse taper gear is too high is solved.

The invention discloses a noise reduction and impact resistance gear structure and a transmission device. The noise reduction and impact resistance gear structure comprises a gear body, a buffering assembly and a noise reduction assembly, wherein the buffering assembly and the noise reduction assembly are arranged in the gear body; the buffering assembly is arranged in the gear body, and the noise reduction assembly comprises sound absorption cotton and is mounted in mounting grooves separated by the fixing frame. The gear box has remarkable noise reduction and impact resistance and can effectively protect gears. And the lubricating device in the gear box can accurately spray oil to provide continuous lubrication for the gear. In the operation process of the gear, the sound absorption cotton can absorb part of sound waves, and noise transmission is remarkably reduced. When the gear is subjected to large impact force, the gear body drives the fixing frame to extrude the telescopic rod, the whole gear body eccentrically moves, and therefore the impact force is dispersed, after the impact force disappears, the movable spring and the sliding spring release energy, the gear body is pushed to recover to the initial state, the service life of the gear is remarkably prolonged, and the operation stability of the gear is remarkably improved.

This invention relates to the field of booms, and discloses a rotary drive mechanism, a boom, and engineering machinery. The rotary drive mechanism includes an annular piston (10) and a stator. The annular piston (10) is provided with piston teeth having protruding curved tooth surfaces and piston teeth having inclined flat tooth surfaces. The stator is provided with stator teeth having protruding curved tooth surfaces and stator teeth having inclined flat tooth surfaces. The annular piston (10) can be driven to move axially relative to the stator. Through the above-described technical solution, the combination of the meshing of curved tooth surfaces and the meshing of flat tooth surfaces can ensure smooth transmission in the initial meshing stage, reduce noise, and allow the subsequent meshing stage to convert axial movement into uniform rotation, providing a more stable torque output.

Disclosed is a rack and pinion drive apparatus (100). The rack and pinion drive apparatus (100) includes a pinion (102) provided with a number of pinion teeth (108) such that each pinion teeth of the plurality of pinion teeth (108) comprises a top land (202) and a bottom land (204). A rack (104) provided with a number of rack teeth (106) such that a set of rack teeth of the plurality of rack teeth (106) includes a rack chamfered edge (112). The top land (202) of each pinion teeth of the number of teeth (108) includes a pinion chamfered edge (202A) such that the pinion chamfered edge (202A) is configured to engage with the rack chamfered edge (112) of the set of rack teeth of the number of rack teeth (106) to facilitate meshing of the plurality of pinion teeth (108) with the number of rack teeth (106).

The utility model discloses a structure-enhanced mute miniature speed-reducing planetary gear box which comprises a box body, a planetary gear ring and a planetary gear assembly. An accommodating cavity is formed in the box body; the planetary gear ring is fixed in the containing cavity, and the planetary gear ring and the planetary gear rotate in a meshed mode to drive the support shaft to rotate; an isolation cavity is formed between the outer wall of the planetary gear ring and the inner wall of the containing cavity, the purpose of forming the isolation cavity through the double-layer structure is to isolate sound from being transmitted outwards, the sound insulation effect is achieved, sound absorption sponge can be assembled in the isolation cavity, and when the sound requirement standard is higher, the sound absorption sponge can be assembled in the isolation cavity to absorb sound, and the better mute effect is achieved. The box body is made of the zinc alloy material, so that the structural strength of the product is effectively enhanced, the planetary gear ring is made of the plastic material, the isolation cavity is formed between the outer wall of the planetary gear ring and the inner wall of the containing cavity in a matched mode, and the sound absorption sponge can be placed in the containing cavity, so that noise generated during operation is effectively reduced, and the silence effect is achieved.

The invention provides a rigid gear and a harmonic reducer, and relates to the technical field of harmonic transmission. The rigid gear comprises a rigid gear body and rigid gear teeth; rigid gear teeth are formed on the inner ring face of the rigid gear body. Cooling flow channels used for circulation of cooling media are formed in the rigid gear body and distributed in the circumferential direction of the rigid gear teeth. According to the rigid wheel, the hollow cooling flow channels are formed in the rigid wheel body, the cooling flow channels are directly formed in the rigid wheel and distributed in the circumferential direction of the rigid wheel teeth, the rigid wheel has the advantages of being extremely short in heat transfer path and small in heat resistance, heat can be rapidly taken away from the source, and the service life of the rigid wheel is prolonged. In other words, the heat emitting position can be directly and efficiently cooled from the inside through flowing of the cooling medium, the heat dissipation performance of the harmonic reducer is remarkably improved, and the problem of how to improve the heat dissipation performance of the harmonic reducer in the prior art is solved.

The utility model relates to an anti-backlash damping planetary gear transmission device in the technical field of planetary gear transmission, which comprises a sun gear, a planet carrier, a plurality of planetary gears and an inner gear ring, the plurality of planetary gears are arranged on the planet carrier in a staggered way, so that the front side surfaces of the tooth parts of part of the planetary gears are in contact with the tooth parts of the inner gear ring in the transmission process; the reverse side surfaces of the tooth parts of the other part of planetary gears are contacted with the tooth parts of the inner gear ring; when the sun gear is driven in the forward direction or the reverse direction, at least part of the planetary gears are meshed with the sun gear and the corresponding front face or the corresponding reverse face of the inner gear ring all the time, and therefore the purposes of eliminating backlash of a gear set, restraining vibration and reducing noise are achieved.

The utility model provides a cable tensioning detection device, which relates to the technical field of force measuring devices and comprises a fixed support, a pressure sensor, a fixed pulley support, an elastic reset piece and a fixed pulley. The pressure sensor is fixedly connected with the fixed bracket or the fixed pulley bracket; the fixed pulley support is slidably arranged relative to the fixed support in the stress direction of the pressure sensor. The two ends of the elastic reset piece are connected with the fixed support and the fixed pulley support correspondingly and used for resetting the fixed pulley support after sliding. The fixed pulley is rotationally mounted on the fixed pulley bracket and is used for lapping a cable of which the tension is to be measured; according to the device, the current tension degree condition of the cable can be obtained according to the pressure of the cable on the fixed pulley, whether the liquid level probe is clamped or not is judged according to the tension degree condition of the cable, then the reel is controlled to stop winding or unwinding the cable, and the problem that the cable is stacked and knotted or snapped is avoided.

A composite gear (100) includes an annular metallic gear hub (102) including a bore (104) and defining a central axis (106) of the composite gear (100). The composite gear (100) includes a composite web (108) disposed circumferentially around the annular metallic gear hub (102) with respect to the central axis (106). The composite gear (10) includes a metallic gear rim (112) disposed circumferentially around the composite web (108) with respect to the central axis (106). The metallic gear rim (112) includes an annular portion (114) disposed adjacent to the composite web (108) and a plurality of gear teeth (116) angularly spaced apart from each other with respect to the central axis (106) and extending outwardly from the annular portion (114) distal to the composite web (108). The composite gear (100) includes an interface (118) disposed between the metallic gear rim (112) and composite web (108). The composite web (108) has a plurality of fibres (110) comprising a set of first fibres (110A) and a set of second fibres (110B) intersecting with the set of first fibres (110A) and inclined to the set of first fibres (110A) by an inclination angle (110C) from 30 degrees to 60 degrees, such that the set of first fibres (110A) and the set of second fibres (110B) together form a mesh (110D) or a woven fabric (110E).

To improve the riding comfort of bicycles equipped with a bicycle power transmission system. [Solution] The bicycle power transmission device comprises a first rotating body, a second rotating body, a friction member, and an elastic member. The second rotating body is arranged to rotate relative to the first rotating body. The friction member is arranged between the first rotating body and the second rotating body. The friction member is arranged to rotate relative to the first rotating body. The friction member is configured to rotate integrally with the second rotating body. The elastic member elastically connects the first rotating body and the second rotating body. The friction member has a base portion, a claw portion, and a projection portion. The base portion is annular. The claw portion extends from the base portion to a first axial side. The projection portion is arranged radially inward relative to the claw portion. The projection portion protrudes from the base portion to a first axial side. The second rotating body has an engagement hole and an engagement recess. The claw portion engages with the engagement hole. The projection portion engages with the engagement recess.

The invention provides a roller, a driving device and a preparation method thereof.The roller comprises a threaded section, a first tooth part and a second tooth part, the threaded section is located between the first tooth part and the second tooth part, the first tooth part comprises first teeth, the first tooth part is provided with first tooth grooves in the circumferential direction of the roller, and the second tooth part is provided with second teeth in the circumferential direction of the roller; the first tooth part comprises a first tooth, the first tooth part comprises a first tooth and a second tooth, the first tooth groove is located between two adjacent first teeth, the second tooth part comprises a second tooth, the second tooth part is provided with a second tooth groove in the circumferential direction of the roller, and the second tooth groove is located between two adjacent second teeth; the first teeth and the second teeth are arranged in a staggered mode in the axial direction of the pin roller. The requirement on machining precision is reduced; the driving device comprises a shell, a driving assembly and an output assembly, at least part of the driving assembly is located in the shell, the driving assembly is connected with the output assembly, the output assembly comprises a sleeve, a pin roller and a lead screw, the sleeve is in threaded fit with the pin roller, the pin roller is in threaded fit with the lead screw, and the pin roller is in threaded fit with the lead screw. And according to the preparation method, a mold is adopted, forming, demolding and other processes are carried out, the pin roller is formed, demolding is convenient, and the machining precision requirement is lowered.

This controls the direction in which the coil spring protrudes. [Solution] The bicycle power transmission device comprises a first rotating body, a first plate, a second plate, and a coil spring. The first rotating body has a hub portion, a flange portion, and a housing hole. The hub portion extends axially. The flange portion extends radially outward from the hub portion. The housing hole is formed in the flange portion. The first plate is positioned on the first axial side relative to the flange portion. The first plate is positioned so as to be rotatable relative to the flange portion. The second plate is positioned on the second axial side relative to the flange portion. The second plate is configured to rotate integrally with the first plate. The coil spring is positioned in the housing hole. The coil spring elastically connects the first rotating body and the first and second plates. The flange portion is inclined axially.

The utility model discloses a suspended fire-fighting pipeline supporting device, which relates to the field of fire-fighting pipeline installation and comprises a pipeline bearing unit and fixing units, the pipeline bearing unit comprises a bearing plate, a pressing plate and two adjusting arms, and the two fixing arms are fixedly installed at the top of the bearing plate. The area between the two fixed arms is used for placing a pipeline; the adjusting arms and the fixed arm can be connected in a relative moving mode, the pressing plate is detachably installed on the two adjusting arms and used for pressing and fixing a pipeline, and a hanging ring used for being connected with a hanging rope is fixedly welded to the upper surface of the pressing plate. The installation height of the pipeline can be quickly and accurately adjusted only by rotating the high-strength screw without field cutting, the installation time is greatly shortened, and the installation efficiency is remarkably improved.

The utility model discloses an anti-abrasion device for a steel wire rope, and relates to the technical field of mechanical traction equipment. The device comprises a supporting seat, two threading assemblies used for guiding a steel wire rope are arranged on the supporting base. An annular groove is formed in the supporting seat; the threading assembly is in sliding connection with the annular groove through a connecting piece. The two threading assemblies are rotationally symmetrical about the center of the annular groove; the threading assembly comprises threading pipes correspondingly arranged outside the annular groove in the radial direction. Pulley blocks are respectively arranged at two ends in the threading pipe; the pulley block comprises two guide pulleys which are vertically arranged at an interval; the guide pulley is rotationally connected in the threading pipe; the axial direction of the guide pulley is parallel to the tangential direction of the annular groove; the threading pipe is further provided with a positioning piece used for locking the threading pipe and the supporting base. The steel wire rope guiding device has the advantages that the guiding direction of the steel wire rope can be flexibly adjusted, and the friction weakening effect on the steel wire rope is better guaranteed.

To provide a steel gear capable of reducing the coefficient of friction.SOLUTION: A steel gear (1) includes: a carburization quench-hardened layer formed on a front surface including tooth surfaces of a plurality of gear teeth (GT); and a core part being a part except the carburization quench-hardened layer. In the carburization quench-hardened layer, when defining an area having a depth of 10 μm from the tooth surface and a length of 50 μm in a tooth trace direction in a cross-section including a normal direction of the tooth surface and the tooth trace direction of the gear tooth (GT) as an outermost layer rectangle area, at least a part of the carburization quench-hardened layer has 7.0% or more of a {203} crystal orientation area ratio obtained by crystal orientation analysis in the normal direction in the outermost layer rectangle area.SELECTED DRAWING: Figure 1

The utility model discloses a differential self-locking mechanism, and relates to the technical field of mechanical transmission, the differential self-locking mechanism comprises a rotating shaft, a driven gear is mounted on the rotating shaft, and one side of the driven gear is engaged with a driving gear; the rotating shaft is provided with an external thread section, and the external thread section is connected with a pressing device used for adjusting the friction force between the driven gears. Wherein the driven gear comprises a first gear body and a second gear body, the first gear body is in sliding fit with the rotating shaft, and the second gear body and the rotating shaft are fixed and rotate synchronously; the modulus of the first gear and the modulus of the second gear are the same, the number of teeth of the first gear is at least one tooth smaller than that of the second gear, the base circle diameter of the first gear and the base circle diameter of the second gear are the same, and the reference circle diameter of the first gear and the reference circle diameter of the second gear are different. The differential self-locking device has the advantages that efficient transmission is kept when the electric actuator works, stability and reliability are improved by the aid of the gear circumference reversing principle in a self-locking state, and differential and high-precision self-locking effects are achieved.

The utility model relates to the field of belt pulleys, and discloses a wear-resistant belt pulley which comprises a belt pulley body, fixing grooves are formed in the two sides of the belt pulley body, reinforcing plates are fixed in the two fixing grooves, a plurality of cooling fins are fixed to the two sides of each reinforcing plate at equal intervals, and the cooling fins are distributed in an axial symmetry mode. Gaps exist between the cooling fins located on the inner sides of the reinforcing plates and the fixing grooves. The multiple cooling fins are fixed to the two sides of the reinforcing plates arranged in the fixing grooves in the two sides of the belt wheel body at equal intervals, the multiple cooling fins are distributed in the axial symmetry mode, the cooling fins can be evenly distributed around the belt wheel, the cooling area is effectively increased, when the belt wheel operates, air can flow through the surfaces of the cooling fins more smoothly, and the cooling efficiency is improved. The heat dissipation is accelerated, the working temperature of the belt pulley is effectively reduced, heat exchange with surrounding air can be more fully carried out, and the heat dissipation efficiency is higher.

Rear bicycle chainring assembly designed for attachment to a chainring support body of a rear bicycle hub assembly, the rear bicycle chainring assembly comprising: several bicycle chainrings, including: a first sprocket, featuring: a first opening with a first minimum diameter that is smaller than a minimum outer diameter of the sprocket support body of the rear bicycle hub assembly; and a second sprocket, having: a second opening having a second minimum diameter that is equal to or greater than the minimum outer diameter of the sprocket support body of the rear bicycle hub assembly; and at least ten internal splined teeth designed to engage with the sprocket support body of the rear bicycle hub assembly, wherein at least one of the at least ten internal sprocket teeth of the second sprocket is symmetrical in the circumferential direction with respect to a reference line extending from the axis of rotation to a circumferential center of a radially outermost end of the at least one of the at least ten internal sprocket teeth in a radial direction with respect to the axis of rotation. which have at least ten internal splined teeth, several internal splined drive surfaces, each comprising several internal splined drive surfaces: a radial outermost edge, a radial innermost edge, and a radial length defined from the radially outermost edge to the radially innermost edge, and a sum of the radial lengths of the multiple internal splined drive surfaces equal to or greater than 7 mm, and wherein at least one of the at least ten internal wedge teeth includes: an internal spline drive surface with a first internal spline surface angle defined between the internal spline drive surface and a first radial line extending from a rotational center axis of the rear bicycle chainring assembly to a radially outermost edge of the internal spline drive surface, and the first internal spline surface angle lies in the range of 0 degrees to 6 degrees.

A multi-sprocket arrangement for a bicycle rear wheel assembly is provided. The arrangement has an axis of rotation and is designed for coupling, for conjoint rotation, to a driver of the rear wheel assembly. The arrangement comprises at least eleven sprockets with differing numbers of teeth. At least two sprockets with the smallest numbers of teeth are formed in a radially self-supporting manner and are coupled to the driver via at least one further sprocket with a greater number of teeth. The three sprockets with the smallest numbers of teeth are arranged such that a sprocket center plane of the sprocket with the third smallest number of teeth of the multi-sprocket arrangement runs in the region of an axial end surface of the driver or axially outside the driver.

The utility model relates to the technical field of precious metal smelting, in particular to a mounting structure for a driving part of a driving roller of a pressurized copper material removal banded extruder. The transmission mechanism comprises a main shaft, a mounted bearing, a chain wheel thrust ring, a chain wheel, a mounting seat, a gear, a labyrinth seal and a driving roller are sequentially mounted on the main shaft in a penetrating manner from left to right, the mounting seat is of an annular structure with a middle protrusion, the middle protrusion penetrates through the chain wheel, and the chain wheel is fixedly mounted on the mounting seat through a pin bolt and a pin nut. And a chain wheel thrust ring is arranged at the end part of the chain wheel, is fixed with the chain wheel through a bolt, and is movably connected with the mounting seat through a clamping groove. According to the installation structure, when overload torque is input into the chain wheel or a hard object is clamped between the driving roller and the driven roller meshed with the driving roller, the pin bolt is cut off, and therefore the spindle head of the spindle is protected against deformation. The utility model provides the structure which is easy to install, convenient to maintain, simple in structure and low in cost, and ensures that the pressurized copper material removal extruder stably runs for a long period.