High-precision single-screw gear box capable of adjusting output runout

Abstract

The utility model relates to a high-precision adjustable output runout single screw gear box, which comprises a box body, an output shaft, a long screw, a front support bearing and a rear support bearing, the head of the output shaft extending out of the box body is provided with the long screw, the two ends of the output shaft are respectively supported by the front support bearing and the rear support bearing, the front support bearing is sleeved with a compensation ring, and the rear support bearing is sleeved with the compensation ring. The rear support bearing is sleeved with an adjusting ring, the compensation ring and the adjusting ring are respectively fixed on a front bearing seat and a rear bearing seat of the box body, the compensation ring is provided with a first eccentric hole corresponding to the front support bearing, the eccentric direction of the first eccentric hole is opposite to the gravity direction, and the adjusting ring is provided with a second eccentric hole corresponding to the rear support bearing.

Description

Technical Field

[0001] The utility model relates to the technical field of gear boxes, in particular to a single-screw gear box with high precision and adjustable output jump. Background Art

[0002] Single-screw extruder gearboxes are widely used in food, plastics, rubber and other industries. Because their output part is equipped with a long screw, there are high requirements for the radial runout of the output shaft of the gearbox.

[0003] like Figure 1 As shown, the output shaft, extending from the housing, is mounted on a long screw. Bearings support the shaft at each end. Due to the weight of the output shaft and the long screw, the radial clearance of the bearings can become excessive (decreased), increasing the radial runout of the output shaft. The current solution requires remachining the housing to adjust the output shaft's radial runout. This approach significantly impacts the machining process and the cleanliness of the finished product, resulting in low assembly efficiency. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a single-screw gearbox with high-precision adjustable output runout, which solves the problem of clearance due to gravity. A compensation ring is arranged outside the front support bearing to compensate for the radial clearance offset by gravity; an eccentric adjustment ring is arranged outside the rear support bearing. By rotating the angle of the adjusting ring, the angle of the eccentric hole is changed, thereby adjusting the radial runout of the output shaft. The radial runout of the output shaft does not require re-processing of the box body, thereby improving assembly efficiency.

[0005] The purpose of this utility model is achieved in this way:

[0006] A single-screw gearbox with high-precision adjustable output runout comprises a box body, an output shaft, a long screw, a front support bearing and a rear support bearing. The head of the output shaft extending out of the box body is equipped with a long screw, and both ends of the output shaft are supported by the front support bearing and the rear support bearing respectively. The outer sleeve of the front support bearing is provided with a compensation ring, and the outer sleeve of the rear support bearing is provided with an adjustment ring. The compensation ring and the adjustment ring are respectively fixed on the front bearing seat and the rear bearing seat of the box body. The compensation ring is provided with a first eccentric hole corresponding to the front support bearing, and the eccentric direction of the first eccentric hole is opposite to the direction of gravity. The adjustment ring is provided with a second eccentric hole corresponding to the rear support bearing.

[0007] Preferably, the head of the compensation ring extends into the front bearing seat, and the tail is provided with a first flange surface, the first flange surface is concentric with the reference outer circle of the compensation ring, and the first flange surface is fixed to the inner end face of the front bearing seat by screws.

[0008] Preferably, there are two screws for fixing the compensation ring, the two screws are symmetrically distributed up and down, and the first flange surface is provided with countersunk holes corresponding to the screws.

[0009] Preferably, the center of the first eccentric hole is located directly above the center of the reference outer circle of the compensation ring.

[0010] Preferably, a limit stop is further provided in the first eccentric hole corresponding to the outer ring of the front support bearing, and the outer ring of the front support bearing is limited and fixed by the limit stop.

[0011] Preferably, the head of the adjustment ring extends into the rear bearing seat, and the tail is provided with a second flange surface, the second flange surface is fixed to the inner end surface of the rear bearing seat by screws, and multiple screws are evenly distributed around the circumference of the second flange surface, the second flange surface is concentric with the reference outer circle of the adjustment ring, and the second flange surface is provided with adjustment holes corresponding to the screws.

[0012] Preferably, eight adjustment holes are evenly distributed on the second flange surface of the adjustment ring, and the eccentric angle changes each time the adjustment ring rotates 45° clockwise or counterclockwise.

[0013] Preferably, the eccentricity of the compensation ring and the adjustment ring is 0.02-0.20 mm.

[0014] The beneficial effects of the utility model are:

[0015] An eccentric compensation ring is installed on the outer sleeve of the supporting bearing at one end close to the long screw. The eccentric direction of the compensation ring is opposite to the direction of gravity to compensate for the radial clearance offset by gravity.

[0016] At the same time, an eccentric adjustment ring is set outside the support bearing at the rear of the output shaft. Adjustment holes are evenly distributed around the circumference of the adjustment ring. Each time it rotates 45° clockwise or counterclockwise, the eccentric angle changes accordingly, thereby adjusting the radial runout value of the output shaft. Under the joint action of the adjustment ring 7 and the compensation ring 6, after multiple debugging of the adjustment ring, the measured radial runout value of the output shaft is minimized, and the radial runout value is ≤0.08mm, which meets the assembly requirements. There is no need to reprocess the box, which greatly improves the assembly efficiency and assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the output shaft assembly of a single-screw gearbox in the prior art.

[0018] Figure 2 This is a structural schematic diagram of a single-screw gearbox with high precision and adjustable output jump in the utility model.

[0019] Figure 3 A cross-sectional view of the compensation ring.

[0020] Figure 4 This is the right side view of the compensation ring.

[0021] Figure 5 A cross-sectional view of the adjustment ring.

[0022] Figure 6 This is the left side view of the adjustment ring.

[0023] Wherein: housing 1; front bearing seat 1.1; rear bearing seat 1.2; output shaft 2; long screw 3; front support bearing 4; rear support bearing 5; compensation ring 6; first eccentric hole 6.1; compensation ring reference outer circle 6.2; first flange surface 6.3; limit stop 6.4; adjustment ring 7; second eccentric hole 7.1; second flange surface 7.2; adjustment ring reference outer circle 7.3. DETAILED DESCRIPTION

[0024] See also Figure 2-6 The utility model relates to a single-screw gearbox with high-precision adjustable output runout, comprising a box body 1, an output shaft 2, a long screw 3, a front support bearing 4 and a rear support bearing 5. The output shaft 2 extends out of the head of the box body 1 and is installed with a long screw 3. Both ends of the output shaft 2 are supported by the front support bearing 4 and the rear support bearing 5 respectively. The outer sleeve of the front support bearing 4 is provided with a compensation ring 6, and the outer sleeve of the rear support bearing 5 is provided with an adjusting ring 7. The compensation ring 6 is fixed to the front bearing seat 1.1 of the box body 1 by screws, and the adjusting ring 7 is fixed to the rear bearing seat 1.2 of the box body 1 by screws. The compensation ring 6 is provided with a first eccentric hole 6.1 corresponding to the front support bearing 4. The compensation ring 6 is eccentric in the vertical direction, and the eccentricity a of the compensation ring 6 is 0.02-0.20 mm. The center of the first eccentric hole 6.1 is located directly above the center of the compensation ring reference outer circle 6.2 (that is, the eccentric direction is opposite to the direction of gravity). The head of the compensation ring 6 extends into the front bearing seat 1.1, and the tail is provided with a first flange surface 6.3. The first flange surface 6.3 is fixed to the inner end surface of the front bearing seat 1.1 by screws. The first flange surface 6.3 is concentric with the compensation ring reference outer circle 6.2. There are two screws, which are distributed up and down. The first flange surface 6.3 is provided with countersunk holes corresponding to the screws to facilitate the inner installation and positioning of the thrust bearing.

[0025] A limit stop 6.4 is further provided in the first eccentric hole 6.1 corresponding to the outer ring of the front support bearing 4, and the outer ring of the front support bearing 4 is limited and fixed by the limit stop 6.4.

[0026] The adjusting ring 7 is provided with a second eccentric hole 7.1 corresponding to the rear support bearing 5. The eccentric distance b of the adjusting ring 7 is 0.02-0.20 mm. The head of the adjusting ring 7 extends into the rear bearing seat 5, and the tail is provided with a second flange surface 7.2. The second flange surface 7.2 is fixed to the inner end surface of the rear bearing seat 1.2 by screws. Multiple screws are evenly distributed around the circumference of the second flange surface 7.2. The second flange surface 7.2 is concentric with the reference outer circle 7.3 of the adjusting ring. The second flange surface 7.2 is provided with an adjustment hole corresponding to the screw.

[0027] like Figure 6There are 8 adjustment holes evenly distributed on the second flange surface 7.2 of the adjusting ring 7. Each time the adjusting ring 7 is rotated 45° clockwise or counterclockwise, the eccentric angle changes accordingly, thereby adjusting the radial runout value of the output shaft 2. Under the joint action of the adjusting ring 7 and the compensation ring 6, after multiple debugging of the adjusting ring 7, the measured radial runout value of the output shaft is minimized, and the radial runout value is ≤0.08mm, meeting the assembly requirements.

[0028] In addition to the above embodiments, the present invention also includes other implementation methods. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of protection of the claims of the present invention.

Claims

1. A high-precision, adjustable output runout single-screw gearbox, comprising a housing, an output shaft, a long screw, a front support bearing, and a rear support bearing. The head of the output shaft extending out of the housing is provided with a long screw, and both ends of the output shaft are supported by the front support bearing and the rear support bearing, respectively. The characteristics are: The front support bearing outer shell is provided with a compensation ring, and the rear support bearing outer shell is provided with an adjustment ring. The compensation ring and the adjustment ring are respectively fixed on the front bearing seat and the rear bearing seat of the box body. The compensation ring is provided with a first eccentric hole corresponding to the front support bearing, and the eccentric direction of the first eccentric hole is opposite to the direction of gravity. The adjustment ring is provided with a second eccentric hole corresponding to the rear support bearing.

2. A high-precision, adjustable output jitter single-screw gearbox according to claim 1, characterized in that: The head of the compensation ring extends into the front bearing seat, and the tail is provided with a first flange surface, which is concentric with the reference outer circle of the compensation ring and is fixed to the inner end surface of the front bearing seat by screws.

3. A high-precision, adjustable output pulsation single-screw gearbox according to claim 2, characterized in that: There are two screws for fixing the compensation ring, and the two screws are symmetrically distributed up and down. The first flange surface is provided with countersunk holes corresponding to the screws.

4. The high-precision, adjustable output pulsation single-screw gearbox according to claim 1, characterized in that: The center of the first eccentric hole is located directly above the center of the reference outer circle of the compensation ring.

5. The high-precision, adjustable output pulsation single-screw gearbox according to claim 1, characterized in that: A limiting stop is further provided in the first eccentric hole corresponding to the outer ring of the front support bearing, and the outer ring of the front support bearing is limited and fixed by the limiting stop.

6. The high-precision, adjustable output jitter single-screw gearbox according to claim 1, characterized in that: The head of the adjusting ring extends into the rear bearing seat, and the tail is provided with a second flange surface. The second flange surface is fixed to the inner end surface of the rear bearing seat by screws. Multiple screws are evenly distributed around the circumference of the second flange surface. The second flange surface is concentric with the reference outer circle of the adjusting ring, and the second flange surface is provided with adjustment holes corresponding to the screws.

7. A high-precision, adjustable output jitter single-screw gearbox according to claim 6, characterized in that: There are 8 adjustment holes evenly distributed on the second flange surface of the adjustment ring. Each time the adjustment ring rotates 45 degrees clockwise or counterclockwise, the eccentric angle changes accordingly.

8. The high-precision, adjustable output jitter single-screw gearbox according to claim 1, characterized in that: The eccentricity of the compensation ring and the adjustment ring is 0.02-0.20 mm.

Images