Lightweight linear bearing

Abstract

The application discloses a light linear bearing and relates to the technical field of bearings. The technical scheme of the light linear bearing comprises an outer sleeve and a retainer which is inserted into the outer sleeve. A plurality of rolling circulation grooves with equal radian are arranged in the retainer, and a plurality of steel balls which are in contact with each other are filled in each rolling circulation groove. The rolling circulation groove is in the shape of a waist groove, the length direction of the rolling circulation groove is the same as the axis direction of the retainer, and an inner side convex groove which is located on the inner side wall of the retainer and a connecting cavity groove which is located on the outer side wall of the retainer are arranged on the two sides in the width direction of the rolling circulation groove. The steel ball protrudes from the inner side convex groove and the connecting cavity groove. The outer sleeve is provided with an outer side convex groove which is matched with the connecting cavity groove and in which the steel ball is embedded. The light linear bearing has the effects of simple structure, high stability and long service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, more particularly to a light linear bearing. BACKGROUND

[0002] Linear bearings are widely used in mechanical transmission fields. A linear bearing includes a housing, a ball retainer structure, and a lubricating oil retainer structure. The ball retainer structure includes a plurality of ball retainer portions, each of which includes a plurality of ball bearings that are movable in a track. The portions are mounted in the housing so that movement of the housing relative to a shaft is achieved by engagement of the ball bearings with the shaft. As the housing moves, the ball bearings move in the respective tracks.

[0003] Chinese patent application document CN103140691A discloses a linear bearing with an improved outer housing liner, which includes a ball retainer structure in which at least a portion of a plurality of open axial ball tracks are formed. The ball tracks include an open load bearing portion, an open return portion, and a turn connecting the load bearing portion and the return portion. A plurality of bearing balls are disposed in the ball tracks. At least one load bearing plate is positioned axially adjacent to the ball retainer structure for receiving a load from the balls disposed in the load bearing portion of the ball tracks.

[0004] However, the linear bearing with an improved outer housing liner has a complex overall structure, and the connection structure between the components is poor in stability during use, which will affect the long-term stable use of the linear bearing, and needs to be improved. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a light linear bearing that has the effects of simple structure, high stability, and long service life.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0007] A light linear bearing includes a housing and a retainer inserted into the housing. The retainer is provided with a plurality of rolling cycle grooves with equal arc lengths. Each rolling cycle groove is filled with a plurality of steel balls that are in contact with each other. The rolling cycle grooves are in the shape of a waist groove and have the same length direction as the axis direction of the retainer. The two sides in the width direction of the rolling cycle grooves are respectively provided with an inner side groove on the inner side wall of the retainer and a connecting cavity groove on the outer side wall of the retainer. The steel balls protrude from the inner side groove and the connecting cavity groove. The housing is provided with an outer side groove that matches the connecting cavity groove and is used for embedding the steel balls.

[0008] By adopting the technical scheme, the retainer is used for connecting the steel balls, and when the steel balls roll to one end of the inner convex groove of the rolling circulation groove, the corresponding side of the steel balls protrudes from the inner side of the retainer to achieve the effect of connecting the rolling shaft body; and when the steel balls roll to one end of the connecting cavity groove of the rolling circulation groove, the corresponding side of the steel balls protrudes from the outer side of the retainer and is embedded in the outer convex groove of the sleeve body to achieve the effect of stably connecting the sleeve body and the retainer, thereby enabling the light straight-line bearing to have the effects of simple structure, high stability and long service life.

[0009] The application further provides that: the sleeve body comprises a sleeve and end rings located at both ends of the sleeve, the inner side of the sleeve is in contact with one side of the outer periphery of the retainer, and the outer convex groove is located on the sleeve; the end rings are used for contacting the two ends of the retainer in the length direction; and at least one of the end rings is provided with a notch.

[0010] By adopting the technical scheme, the structure of the sleeve body and the retainer is simplified, and the sleeve body and the retainer are connected in the form of contact, so that the stability of the connecting structure of the sleeve body and the retainer is significantly improved.

[0011] The application further provides that: a plurality of interval grooves with equal arc distribution are arranged on the outer peripheral sidewall of the retainer, and the interval grooves are located at the middle positions of the corresponding rolling circulation grooves.

[0012] By adopting the technical scheme, the interval grooves play a role in increasing the structural elasticity of the retainer, so that when the steel balls roll, the interval grooves will generate elastic restoring force when compressed to drive the steel balls to reset.

[0013] The application further provides that: the retainer is injection molded by modified polyoxymethylene; and the preparation method of the modified polyoxymethylene comprises the following steps:

[0014] Step 1: 30-36 parts of polyoxymethylene, 6-8 parts of polyethylene glycol, 3-5 parts of tackifier and 2-4 parts of carbon black are taken by weight and stirred in a stirring kettle, the temperature in the stirring kettle is controlled to be 90-95 DEG C, and the stirring time is 10-15 min to obtain mixed materials;

[0015] Step 2: the mixed materials and 4-6 parts of organic acid by weight are introduced into a double-screw extruder for mixing, extruding and shearing to obtain modified polyoxymethylene particles.

[0016] By adopting the technical scheme, the retainer prepared by the modified polyoxymethylene particles has the effects of large structural strength, wear resistance, fatigue resistance, heat resistance and high bending strength.

[0017] The application further provides that: the organic acid is at least one of tartaric acid, oxalic acid, salicylic acid, malic acid, ethanedioic acid, malonic acid and citric acid.

[0018] By adopting the technical scheme, carbon dioxide and water are generated when the organic acid is thermally decomposed, and then the water is evaporated at high temperature and the structure strength of the modified polyformaldehyde particles is improved.

[0019] The application further provides that the tackifier is a terpene resin.

[0020] By adopting the technical scheme, the tackiness of the modified polyformaldehyde particles is significantly increased.

[0021] The application further provides that the carbon black is porous spherical bamboo charcoal powder, and a preparation method of the porous spherical bamboo charcoal powder comprises the following steps: ①, soaking bamboo in 10% dilute nitric acid for 12 hours and then taking out and air drying to obtain pretreated bamboo; ②, crushing the pretreated bamboo in a pulverizer to obtain bamboo powder; and ③, introducing sodium hydroxide and hydrogen peroxide into the bamboo powder at a weight ratio of 4:1:3, and calcining the mixture in an inert gas boiler at 600 DEG C for 1-2 hours to obtain the finished product of the porous spherical bamboo charcoal powder.

[0022] By adopting the technical scheme, the finished product of the porous spherical bamboo charcoal powder plays a role in significantly improving the structural strength, wear resistance, fatigue resistance, heat resistance and bending strength of the prepared retainer.

[0023] The application further provides that in step 2, the extrusion temperatures of the respective extrusion intervals in the twin-screw extruder are 110-135 DEG C, 130-145 DEG C, 155-165 DEG C, 160-170 DEG C, 160-175 DEG C, 165-180 DEG C and 170-190 DEG C, respectively.

[0024] By adopting the technical scheme, the modified polyformaldehyde particles with the effects of high structural strength, wear resistance, fatigue resistance, heat resistance and bending strength are efficiently obtained.

[0025] In summary, the application has the following beneficial effects: by optimizing the structure of the light linear bearing and using polyformaldehyde, polyethylene glycol, organic acid, tackifier and carbon black to prepare the retainer in the light linear bearing, the overall mass of the light linear bearing is reduced, the structural strength of the retainer is effectively improved, and the light linear bearing has the effects of simple structure, high stability and long service life. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the embodiment;

[0027] Figure 2 is a partial sectional view of the embodiment;

[0028] Figure 3is a schematic diagram of the sectional structure of the retainer of the present embodiment;

[0029] Figure 4 is a schematic diagram of the sectional structure of the sleeve body of the present embodiment.

[0030] Reference sign explanation: 1, sleeve body; 11, sleeve; 12, end ring; 13, embedding opening; 14, outer side convex groove; 2, retainer; 21, rolling circulation groove; 211, inner side convex groove; 212, connecting cavity groove; 22, spacing groove; 3, steel ball. DETAILED DESCRIPTION

[0031] In order to make the technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0032] The light-weight linear bearing of the present application will be described in detail below.

[0033] As shown in Figure 1 , a light-weight linear bearing comprises a sleeve body (1) and a retainer (2) inserted into the sleeve body (1). A plurality of rolling circulation grooves (21) with equal arc length are arranged in the retainer (2), and each rolling circulation groove (21) is filled with a plurality of steel balls (3) in contact with each other.

[0034] As shown in Figure 1 , Figure 2 , the rolling circulation groove (21) is in the shape of a waist groove and has the same length direction as the axis direction of the retainer (2), and the inner side convex groove (211) on the inner side wall of the retainer (2) and the connecting cavity groove (212) on the outer side wall of the retainer (2) are arranged on the two sides in the width direction. The steel ball (3) protrudes from the corresponding inner side convex groove (211) and connecting cavity groove (212), and the outer side convex groove (14) matching the corresponding connecting cavity groove (212) and allowing the corresponding steel ball (3) to be embedded is arranged on the sleeve body (1). Therefore, the retainer (2) is used to connect the steel ball (3), and when the steel ball (3) rolls to one end of the inner side convex groove (211) of the rolling circulation groove (21), the corresponding side of the steel ball (3) protrudes from the inner side of the retainer (2) to achieve the effect of rolling connection with the shaft body; and when the steel ball (3) rolls to one end of the connecting cavity groove (212) of the rolling circulation groove (21), the corresponding side of the steel ball (3) protrudes from the outer side of the retainer (2) and is embedded in the outer side convex groove (14) of the sleeve body (1) to achieve the effect of stable connection between the sleeve body (1) and the retainer (2), thereby making the light-weight linear bearing have the effects of simple structure, high stability and long service life.

[0035] It should be noted that, as shown in Figure 1 , Figure 4 , the outer sleeve (1) includes a sleeve (11) and end rings (12) located at both ends of the sleeve (11). Among them, the inner side of the sleeve (11) is in contact with one side of the outer periphery of the holder (2), and the outer side of the sleeve (11) is provided with a groove (14). The end ring (12) is used to contact the end of the holder (2) in the length direction, and at least one of the end rings (12) is provided with a socket (13), thereby simplifying the structure of the outer sleeve (1) and the holder (2), and connecting in the form of contact, so as to significantly improve the stability of the connection structure of the outer sleeve (1) and the holder (2).

[0036] As shown in Figure 1 , Figure 3 , a plurality of arcuate distribution interval grooves (22) are arranged on the outer peripheral side wall of the holder (2), and the interval grooves (22) are located at the intermediate part of the corresponding rolling cycle grooves (21). The interval grooves (22) play a role in increasing the structural elasticity of the holder (2), so that when the steel balls (3) roll, the interval grooves (22) will generate elastic recovery force when compressed to drive the steel balls (3) to reset.

[0037] It should be noted that the holder is injection molded by modified polyformaldehyde.

[0038] The preparation method of the modified polyformaldehyde comprises the following steps:

[0039] Step 1, 30-36 parts by weight of polyformaldehyde, 6-8 parts by weight of polyethylene glycol, 3-5 parts by weight of tackifier and 2-4 parts by weight of carbon black are taken into the stirring kettle for stirring, the temperature in the stirring kettle is controlled at 90-95℃, and the stirring time is 10-15min, to obtain mixed material;

[0040] Step 2, the mixed material and 4-6 parts by weight of organic acid are introduced into the double screw extruder for mixing, extruding and shearing, and the extrusion temperature of each extrusion interval in the double screw extruder is 110-135℃, 130-145℃, 155-165℃, 160-170℃, 160-175℃, 165-180℃ and 170-190℃, respectively, to obtain modified polyformaldehyde particles.

[0041] Therefore, when the modified polyformaldehyde is prepared by using the preparation method, the modified polyformaldehyde particles with the effects of high structural strength, wear resistance, fatigue resistance, heat resistance and high bending strength can be efficiently obtained, and the holder prepared by the modified polyformaldehyde particles has the effects of high structural strength, wear resistance, fatigue resistance, heat resistance and high bending strength.

[0042] The organic acid used is at least one of tartaric acid, oxalic acid, salicylic acid, malic acid, ethanedioic acid, propanedioic acid and citric acid, so that the organic acid produces carbon dioxide and water during thermal decomposition, and then combines the evaporation of water at high temperature and the carbon black to improve the structural strength of the modified polyformaldehyde particles. The tackifier is a terpene resin, which significantly increases the tackiness of the modified polyformaldehyde particles.

[0043] At the same time, the carbon black used is a porous spherical bamboo charcoal powder, and the preparation method of the porous spherical bamboo charcoal powder comprises the following steps: ①, soaking bamboo in 10% dilute nitric acid for 12 hours, then taking out and air drying to obtain pretreated bamboo; ②, crushing the pretreated bamboo in a pulverizer to obtain bamboo powder; ③, introducing sodium hydroxide and hydrogen peroxide into the bamboo powder at a weight ratio of 4:1:3, and calcining in an inert gas boiler at 600°C for 1-2 hours to obtain the finished porous spherical bamboo charcoal powder. Therefore, the finished porous spherical bamboo charcoal powder will significantly improve the structural strength, wear resistance, fatigue resistance, heat resistance and bending strength of the prepared holder.

[0044] Example one

[0045] As shown in Figure 1 , a light straight bearing comprises a sleeve body (1) and a holder (2) inserted into the sleeve body (1). A plurality of rolling circulation grooves (21) with equal arc are arranged in the holder (2), and each rolling circulation groove (21) is filled with a plurality of steel balls (3) in contact with each other.

[0046] As shown in Figure 1 , Figure 2 , the rolling circulation groove (21) is a waist groove and the length direction is the same as the axis direction of the holder (2), and the two sides in the width direction are respectively provided with an inner side groove (211) on the inner side wall of the holder (2) and a connecting cavity groove (212) on the outer side wall of the holder (2). Wherein, the steel ball (3) protrudes from the corresponding inner side groove (211) and connecting cavity groove (212), and the outer sleeve (1) is provided with an outer side groove (14) matched with the corresponding connecting cavity groove (212) and embedded with the corresponding steel ball (3). Therefore, the holder (2) is used to connect the steel ball (3), and when the steel ball (3) rolls to one end of the inner side groove (211) of the rolling circulation groove (21), the corresponding side of the steel ball (3) protrudes from the inner side of the holder (2) to realize the effect of rolling connection of the shaft body; and when the steel ball (3) rolls to one end of the connecting cavity groove (212) of the rolling circulation groove (21), the corresponding side of the steel ball (3) protrudes from the outer side of the holder (2) and is embedded in the outer side groove (14) of the outer sleeve (1) to realize the effect of stable connection of the outer sleeve (1) and the holder (2), so that the light straight bearing has the effects of simple structure, high stability and long service life.

[0047] It should be noted that, as shown in Figure 1 , Figure 4 , the outer sleeve (1) includes a sleeve (11) and end rings (12) located at both ends of the sleeve (11). Among them, the inner side of the sleeve (11) is in contact with one side of the outer periphery of the holder (2), and the outer side of the sleeve (11) is provided with a groove (14). The end ring (12) is used to contact the end of the holder (2) along the length direction, and at least one of the end rings (12) is provided with a socket (13), thereby simplifying the structure of the outer sleeve (1) and the holder (2), and connecting in the form of contact, so as to significantly improve the stability of the connection structure of the outer sleeve (1) and the holder (2).

[0048] As shown in Figure 1 , Figure 3 , a plurality of arcuate distribution interval grooves (22) are arranged on the outer peripheral side wall of the holder (2), and the interval grooves (22) are located at the intermediate part of the corresponding rolling cycle grooves (21). The interval grooves (22) play a role in increasing the structural elasticity of the holder (2), so that when the steel balls (3) roll, the interval grooves (22) will generate elastic recovery force when compressed to drive the steel balls (3) to reset.

[0049] It should be noted that the holder is injection molded by modified polyformaldehyde.

[0050] The preparation method of the modified polyformaldehyde comprises the following steps:

[0051] Step 1, 30 parts of polyformaldehyde, 6 parts of polyethylene glycol, 3 parts of tackifier and 2 parts of carbon black are taken by weight and stirred in a stirring kettle, the temperature in the stirring kettle is controlled at 90°C, and the stirring time is 10 min, to obtain mixed material;

[0052] Step 2, the mixed material and 4 parts of organic acid by weight are introduced into a double screw extruder for mixing, extruding and shearing, and the extrusion temperatures of each extrusion interval in the double screw extruder are 110-135°C, 130-145°C, 155-165°C, 160-170°C, 160-175°C, 165-180°C and 170-190°C, respectively, to obtain modified polyformaldehyde particles.

[0053] Therefore, when the modified polyformaldehyde is prepared by using the preparation method, the modified polyformaldehyde particles with the effects of high structural strength, wear resistance, fatigue resistance, heat resistance and high bending strength can be efficiently obtained, and the holder prepared by the modified polyformaldehyde particles has the effects of high structural strength, wear resistance, fatigue resistance, heat resistance and high bending strength.

[0054] The organic acid used is tartaric acid, so that the organic acid produces carbon dioxide and water during thermal decomposition, and then the evaporation of water at high temperature and the modification of the structure strength of the carbon black are combined to improve the structure strength of the modified polyformaldehyde particles. The tackifier is terpene resin, which significantly increases the tackiness of the modified polyformaldehyde particles.

[0055] At the same time, the carbon black used is porous spherical bamboo charcoal powder, and the preparation method of the porous spherical bamboo charcoal powder comprises the following steps: step ①, soaking bamboo in 10% dilute nitric acid for 12 hours, then taking it out and air drying to obtain pretreated bamboo; step ②, crushing the pretreated bamboo in a pulverizer to obtain bamboo powder; step ③, introducing sodium hydroxide and hydrogen peroxide into the bamboo powder at a weight ratio of 4:1:3, and placing it in an inert gas boiler at 600℃ for calcination for 1 hour to obtain the finished porous spherical bamboo charcoal powder. Therefore, the finished porous spherical bamboo charcoal powder will significantly improve the structure strength, wear resistance, fatigue resistance, heat resistance and bending strength of the prepared holder.

[0056] Example Two

[0057] The difference between Example Two and Example One is that the preparation method of the modified polyformaldehyde in Example Two comprises the following steps:

[0058] Step 1, take 33 parts of polyformaldehyde, 7 parts of polyethylene glycol, 4 parts of tackifier and 3 parts of carbon black by weight into a stirring kettle and stir, control the temperature in the stirring kettle to be 93℃, and the stirring time to be 13 minutes, to obtain mixed material;

[0059] Step 2, introduce the mixed material and 5 parts of organic acid by weight into a double screw extruder for mixing, extruding and shearing, and the extrusion temperature of each extrusion interval in the double screw extruder is 110-135℃, 130-145℃, 155-165℃, 160-170℃, 160-175℃, 165-180℃ and 170-190℃ respectively, to obtain modified polyformaldehyde particles.

[0060] The organic acid used is malic acid and malonic acid.

[0061] At the same time, the carbon black used is porous spherical bamboo charcoal powder, and the preparation method of the porous spherical bamboo charcoal powder comprises the following steps: step ①, soaking bamboo in 10% dilute nitric acid for 12 hours, then taking it out and air drying to obtain pretreated bamboo; step ②, crushing the pretreated bamboo in a pulverizer to obtain bamboo powder; step ③, introducing sodium hydroxide and hydrogen peroxide into the bamboo powder at a weight ratio of 4:1:3, and placing it in an inert gas boiler at 600℃ for calcination for 1.5 hours to obtain the finished porous spherical bamboo charcoal powder.

[0062] Example Three

[0063] The difference between the embodiment three and the embodiment one is that the preparation method of the modified polyformaldehyde in the embodiment three comprises the following steps.

[0064] The preparation method of the modified polyformaldehyde comprises the following steps:

[0065] Step 1, 36 parts of polyformaldehyde, 8 parts of polyethylene glycol, 5 parts of tackifier and 4 parts of carbon black are taken by weight and stirred in a stirred kettle, the temperature in the stirred kettle is controlled at 95℃, and the stirring time is 15 min, to obtain mixed material;

[0066] Step 2, the mixed material and 6 parts of organic acid by weight are introduced into a double screw extruder for mixing, extruding and shearing, and the extrusion temperatures of each extrusion interval in the double screw extruder are 110-135℃, 130-145℃, 155-165℃, 160-170℃, 160-175℃, 165-180℃ and 170-190℃ respectively, to obtain modified polyformaldehyde particles.

[0067] Among them, the organic acid used is oxalic acid, malic acid and oxalic acid,

[0068] At the same time, the carbon black used is porous spherical bamboo charcoal powder, and the preparation method of the porous spherical bamboo charcoal powder comprises the following steps: ①, the bamboo is soaked in 10% dilute nitric acid for 12 h and then taken out and dried to obtain pretreated bamboo; ②, the pretreated bamboo is crushed in a pulverizer to obtain bamboo powder; ③, sodium hydroxide and hydrogen peroxide in a weight ratio of 4:1:3 are introduced into the bamboo powder, and the mixture is calcined in an inert gas boiler at 600℃ for 2 h to obtain the finished product of porous spherical bamboo charcoal powder.

[0069] In summary, the structure of the light linear bearing is optimized, and the retainer in the light linear bearing is prepared from polyformaldehyde, polyethylene glycol, organic acid, tackifier and carbon black, so that the overall mass of the light linear bearing is reduced, the structural strength of the retainer is effectively improved, and the light linear bearing has the effects of simple structure, high stability and long service life.

[0070] The terms "first", "second", "third", "fourth" and the like, if any, as used herein are used as identifiers to distinguish between similar objects, and are not necessarily intended to denote a particular order or sequence. It is to be understood that the use of the terms "first", "second", "third", "fourth", etc. herein does not necessarily limit the scope of any embodiments described herein, but can be used in conjunction with other embodiments and / or examples, in any suitable way. It is to be understood that the data so used in the description and the claims is merely illustrative as to the use of the word "first", "second", "third", "fourth", etc.

[0071] It should be noted that the terms "first", "second", and the like in the description and in the claims do not denote any particular importance, but are merely used to distinguish one element from another. Thus, a "first" and "second" feature can include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it is considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0072] The principles and implementation modes of the present application are described by applying specific examples herein. The above description of the examples is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation modes and application ranges will be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A lightweight linear bearing, characterized in that: The device includes an outer casing and a retainer inserted into the outer casing. The retainer contains multiple rolling circulation grooves with equal arc distribution, and each rolling circulation groove is filled with multiple steel balls that contact each other sequentially. Each rolling circulation groove is waist-shaped and its length direction is the same as the axis of the retainer. On both sides of its width direction are inner protrusions located on the inner wall of the retainer and connecting cavities located on the outer wall of the retainer, respectively. The steel balls protrude from the corresponding inner protrusions and connecting cavities. The outer casing has outer protrusions that match the corresponding connecting cavities and allow the corresponding steel balls to be inserted. Wherein: The retainer is injection molded from modified polyoxymethylene; the preparation method of the modified polyoxymethylene includes the following steps: Step 1: Take 30-36 parts by weight of polyoxymethylene, 6-8 parts of polyethylene glycol, 3-5 parts of tackifier and 2-4 parts of carbon black and put them into a mixing tank. Control the temperature inside the mixing tank to 90-95℃ and the mixing time to 10-15 minutes to obtain a mixed material. Step 2: The mixed materials and 4-6 parts by weight of organic acid are introduced into a twin-screw extruder for mixing, extrusion and shearing to obtain modified polyoxymethylene granules; The carbon black is porous spherical bamboo charcoal powder, and the preparation method of porous spherical bamboo charcoal powder includes step ①, soaking bamboo in 10% dilute nitric acid for 12 hours and then taking it out and air drying to obtain pretreated bamboo; step ②, crushing the pretreated bamboo in a pulverizer to obtain bamboo powder; step ③, introducing sodium hydroxide and hydrogen peroxide in a weight ratio of 4:1:3 with the bamboo powder into the bamboo powder, and calcining it in an inert gas boiler at 600℃ for 1-2 hours to obtain the finished porous spherical bamboo charcoal powder.

2. The lightweight linear bearing according to claim 1, characterized in that: The outer sleeve includes a sleeve and end rings located at both ends of the sleeve. The inner side of the sleeve contacts one side of the outer circumference of the retainer, and the outer protrusion is located on the sleeve. The end rings are used to contact the two ends of the retainer along the length direction. At least one of the end rings is provided with a notch.

3. A lightweight linear bearing according to claim 1, characterized in that: The outer peripheral sidewall of the retainer is provided with a plurality of equally arc-shaped interval grooves, and the interval grooves are located in the middle part of the corresponding rolling circulation groove.

4. A lightweight linear bearing according to claim 1, characterized in that: The organic acid is at least one selected from tartaric acid, oxalic acid, salicylic acid, malic acid, oxalic acid, malonic acid, and citric acid.

5. A lightweight linear bearing according to claim 1, characterized in that: The tackifier is a terpene resin.

6. A lightweight linear bearing according to claim 1, characterized in that: In step 2, the extrusion temperatures of each extrusion zone in the twin-screw extruder are 110-135℃, 130-145℃, 155-165℃, 160-170℃, 160-175℃, 165-180℃, and 170-190℃, respectively.

Images