Tool clamp for shell of worm and gear speed reducer

Abstract

The utility model provides a tool clamp for a shell of a worm and gear speed reducer, and belongs to the technical field of clamps. The problem that the clamping efficiency is low is solved. The tool clamp for the shell of the worm and gear speed reducer comprises a fourth shaft with a bridge plate and a positioning assembly fixed to the bridge plate, a first pressing piece and a second pressing piece are fixed to the bridge plate, and the first pressing piece and the second pressing piece are distributed in the length direction of the bridge plate. The first pressing piece comprises a first acting oil cylinder and a first pressing block driven by the first acting oil cylinder to move up and down, the second pressing piece comprises a second acting oil cylinder and a second pressing block driven by the second acting oil cylinder to move up and down, the end, close to the first pressing block, of the second pressing block is provided with two pressing parts, and a receding groove is formed between the two pressing parts in the width direction of the bridge plate. The fixture has the advantages of high clamping efficiency, firmness in clamping and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of jigs and relates to a workbench jig for a housing of a worm and worm gear reducer. Background Art

[0002] A worm and worm gear reducer is a power transmission mechanism that uses a gear speed converter to reduce the rotational speed of a motor to the required rotational speed and obtain a larger torque. As the name implies, it has the functions of speed reduction and torque increase. As Figure 5 and Figure 6 shown, a housing 9 of a worm and worm gear reducer is provided. It includes a worm wheel mounting portion 9a that is generally circular and a worm mounting portion 9b that is integrally and fixedly connected to the outer circle of the worm wheel mounting portion 9a and is generally cylindrical. The worm wheel mounting portion 9a has a worm wheel mounting hole 9a1, and the worm wheel mounting hole 9a1 penetrates through one side surface of the worm wheel mounting portion 9a. A circular convex platform 9a2 protrudes from the central region of the other side surface of the worm wheel mounting portion 9a. A bearing mounting hole 9a3 is provided in the convex platform 9a2. The bearing mounting hole 9a3 is concentric with and communicated with the worm wheel mounting hole 9a1. A worm mounting hole 9b1 is provided through the worm mounting portion 9b along its length direction. The center line of the worm mounting hole 9b1 is perpendicular to the center line of the worm wheel mounting hole 9a1 and the worm mounting hole 9b1 is communicated with the worm wheel mounting hole 9a1. Further, two first ears 9c protrude from the outer circle of the worm wheel mounting portion 9a, and two second ears 9d protrude from the side portion of the worm mounting portion 9b. The protruding directions of the first ears 9c and the second ears 9d are opposite. The first ears 9c and the second ears 9d are both provided with connection holes 9e along the center line direction of the worm wheel mounting hole 9a1. When the housing 9 is placed flat, the first ears 9c and the second ears 9d are flush with each other, and the connection holes 9e are located at the four vertex positions of a rectangle. The setting of the connection holes 9e is used to realize the installation and fixation of the worm and worm gear reducer during use.

[0003] In practice, the blanks of the housing 9 are all castings. After obtaining the blank of the housing 9, boring is required for the worm wheel mounting hole 9a1, the bearing mounting hole 9a3, and the worm mounting hole 9b1. Since the center line of the worm mounting hole 9b1 is perpendicular to the center line of the worm wheel mounting hole 9a1, during boring, a fourth axis and a machining center are used in combination. Specifically, a jig is provided on the bridge plate of the fourth axis, and the housing 9 is clamped and fixed on the jig in a manner that the center line of the worm wheel mounting hole 9a1 is perpendicular to the bridge plate. Then, the fourth axis is installed and fixed in the machining center. First, boring is sequentially performed on the worm wheel mounting hole 9a1 and the bearing mounting hole 9a3, and then the fourth axis operates to turn the bridge plate 90° until the worm mounting hole 9b1 is in a vertical state for boring. Currently, the housing 9 is clamped and fixed on the jig entirely by manual operation of workers, so there is a problem of low clamping efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above problems existing in the prior art and to propose a fixture for the housing of a worm gear reducer, thereby solving the problem of low clamping efficiency.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A tooling fixture for the housing of a worm gear reducer, comprising a fourth axis with a bridge plate and a positioning assembly fixed to the bridge plate, characterized in that a clamping piece 1 and a clamping piece 2 are fixed to the bridge plate, the clamping piece 1 and the clamping piece 2 are distributed along the length direction of the bridge plate, the clamping piece 1 comprises an acting cylinder 1 and a pressure block 1 driven by the acting cylinder 1 to move up and down, the clamping piece 2 comprises an acting cylinder 2 and a pressure block 2 driven by the acting cylinder 2 to move up and down, the pressure block 2 has two clamping parts at one end close to the pressure block 1, and a clearance groove is formed between the two clamping parts along the width direction of the bridge plate.

[0007] When in use, the housing is pressed against the positioning assembly with the boss facing downward, and then the housing is pressed in the direction perpendicular to the bridge plate by pressing piece 1 and pressing piece 2. Specifically, the acting oil cylinder 1 drives the pressing block 1 to move downward and press on the worm mounting part of the housing, while the acting oil cylinder 2 drives the pressing block 2 to move downward, and the two pressing parts of the pressing block 2 press on the two ears 1 outside the worm gear mounting part (the clearance groove between the two pressing parts is for the outer circumference of the worm gear mounting part to make way to avoid interfering with the clamping of the two pressing parts).

[0008] The fixture can realize automatic clamping of the housing in the direction perpendicular to the bridge plate by driving the pressure block 1 through the action of the oil cylinder 1 and driving the pressure block 2 through the action of the oil cylinder 2, thereby improving the clamping efficiency. Moreover, by providing the two clamping parts of the pressure block 2 and forming a clearance groove between the two clamping parts along the width direction of the bridge plate, the pressure block 2 can be pressed on the two ears 1 of the housing at the same time, rather than on the worm gear mounting part (when the housing is in the state where the boss faces downward, the side of the worm gear mounting part penetrated by the worm gear mounting hole has very little physical area available for clamping), thus increasing the effective clamping area and improving the firmness of the clamping.

[0009] In the above-mentioned fixture for the housing of the worm gear reducer, the second pressure block has a long strip-shaped transition portion arranged along the width direction of the bridge plate, and the two clamping portions are respectively located at the two ends of the transition portion and protrude in the direction close to the clamping piece one.

[0010] The arrangement of the long strip-shaped transition part along the width direction of the bridge plate ensures that there is a certain distance between the two pressing parts, thus ensuring that the two pressing parts can be smoothly pressed on the two ear parts.

[0011] In the above-mentioned fixture for the housing of a worm and worm gear reducer, both pressing parts are inclined relative to the transition part. The inclination angles of the two pressing parts are the same and the inclination directions are opposite. The distance between the two pressing parts gradually decreases in the direction away from the first pressing member.

[0012] Through the above settings, the relief groove located between the two pressing parts can provide more relief for the outer circular part of the worm wheel installation part, increasing the effective pressing area of the second pressing block and improving the clamping firmness.

[0013] In the above-mentioned fixture for the housing of a worm and worm gear reducer, the second pressing member further includes a second connecting rod. The second pressing block also has a connecting part arranged in a long strip shape along the length direction of the bridge plate. The transition part is connected to one end of the connecting part, and the other end of the connecting part is hinged to the upper end of the piston rod of the second acting oil cylinder. One end of the second connecting rod is hinged to the cylinder block of the second acting oil cylinder, and the other end of the second connecting rod is hinged to the connecting part.

[0014] Through the above settings, the second pressing block forms a lever-type action mode. Specifically, when the piston rod of the second acting oil cylinder is pushed upward, one end of the connecting part of the second pressing block moves upward synchronously, and the other end of the connecting part will move downward, thereby causing the two pressing parts to press on the two first ear parts of the housing synchronously.

[0015] In the above-mentioned fixture for the housing of a worm and worm gear reducer, the first pressing block is arranged in a long strip shape along the length direction of the bridge plate. The first pressing member further includes a first connecting rod. One end of the first pressing block away from the second pressing member is hinged to the upper end of the piston rod of the first acting oil cylinder. One end of the first connecting rod is hinged to the cylinder block of the first acting oil cylinder, and the other end of the first connecting rod is hinged to the middle part of the first pressing block along the length direction of the bridge plate.

[0016] Through the above settings, the first pressing block forms a lever-type action mode. Specifically, when the piston rod of the first acting oil cylinder is pushed upward, one end of the first pressing block moves upward synchronously, and the other end of the first pressing block will move downward to press on the worm installation part of the housing.

[0017] In the above-mentioned fixture for the housing of a worm and worm gear reducer, the positioning component includes four positioning columns and two positioning blocks. The four positioning columns are located at the vertices of a rectangle with the same length direction as the bridge plate. The upper end of the positioning column has a positioning head with an outer diameter smaller than other positions of the positioning column. One of the positioning blocks is located between two of the positioning columns along the length direction of the bridge plate, and the other positioning block is located between the remaining two positioning columns along the length direction of the bridge plate. The two positioning blocks are arranged opposite to each other along the width direction of the bridge plate. The opposite sides of the upper ends of the two positioning blocks both have arc-shaped positioning surfaces. The two positioning surfaces are concentrically arranged and have the same radius.

[0018] The four connecting holes of the housing are sleeved on the positioning head so that each ear part 1 and each ear part 2 are pressed against each positioning column, and the outer circle of the boss is pressed against the positioning surface on the opposite side of the two positioning blocks to achieve centering, so that the center of the circle is determined and the circumferential positioning of the housing is achieved at the same time. Through such a setting, the position accuracy of the worm wheel mounting hole and the worm mounting hole can be guaranteed at the same time, so as to ensure the final boring accuracy.

[0019] In the above-mentioned tooling fixture for the housing of the worm gear reducer, the positioning assembly also includes two floating support cylinders, which are located in the area between the four positioning columns. The two floating support cylinders are distributed along the length direction of the bridge plate and are located between clamping member one and clamping member two.

[0020] The worm mounting portion will abut against one of the floating support cylinders, and the worm wheel mounting portion will abut against the other floating support cylinder. The use of two floating support cylinders can provide more supporting force, thereby avoiding vibration during boring and affecting the boring accuracy.

[0021] In the above-mentioned fixture for the housing of the worm gear reducer, the bridge plate is fixedly connected to the mounting plate by fasteners, and the positioning assembly, the first clamping member and the second clamping member are all fixed on the mounting plate.

[0022] The mounting plate, the positioning assembly, the clamping piece 1 and the clamping piece 2 form a small module, which means that in practice, corresponding small modules can be configured for shells of different specifications, so that when clamping and fixing shells of different specifications, only the corresponding small modules need to be replaced.

[0023] Compared with the prior art, the fixture for the housing of the worm gear reducer has the following advantages:

[0024] 1. By driving the first action of the pressure block by the first acting cylinder and driving the second action of the pressure block by the second acting cylinder, the shell can be automatically clamped in the direction perpendicular to the bridge plate, thereby improving the clamping efficiency.

[0025] 2. By setting the two pressing parts of the pressing block 2 and forming a clearance groove between the two pressing parts along the width direction of the bridge plate, the pressing block 2 can be pressed on the two ear parts 1 of the shell at the same time, instead of pressing on the worm gear mounting part (when the shell is in the state of the boss facing downward, the side of the worm gear mounting part penetrated by the worm gear mounting hole has very little solid area available for pressing), thus increasing the effective pressing area and improving the firmness of the pressing;

[0026] 3. Through the setting of four positioning columns and two positioning blocks, the center of the circle is determined and the circumferential positioning of the shell is achieved. The position accuracy of the worm wheel mounting hole and the worm mounting hole can be guaranteed at the same time, thereby ensuring the final boring accuracy. Brief Description of the Drawings

[0027] Figure 1 is a three-dimensional schematic diagram of a fixture for the housing of a worm and worm gear reducer.

[0028] Figure 2 is a top view of a fixture for the housing of a worm and worm gear reducer.

[0029] Figure 3 is Figure 1 an enlarged schematic diagram of the second pressing member in

[0030] Figure 4 is a three-dimensional schematic diagram of the fixture for the housing of a worm and worm gear reducer after clamping and fixing the housing.

[0031] Figure 5 is a three-dimensional schematic diagram of the housing.

[0032] Figure 6 is a three-dimensional schematic diagram of the housing from another angle.

[0033] In the figure, 1. Fourth shaft; 1a. Bridge plate; 2. Positioning assembly; 3. First pressing member; 3a. First acting oil cylinder; 3b. First pressing block; 3c. First connecting rod; 4. Second pressing member; 4a. Second acting oil cylinder; 4b. Second pressing block; 4b1. Pressing portion; 4b2. Relief groove; 4b3. Transition portion; 4b4. Connecting portion; 4c. Second connecting rod; 5. Positioning column; 5a. Positioning head; 6. Floating support oil cylinder; 7. Positioning block; 7a. Positioning surface; 8. Mounting plate; 9. Housing; 9a. Worm wheel mounting portion; 9a1. Worm wheel mounting hole; 9a2. Boss; 9a3. Bearing mounting hole; 9b. Worm mounting portion; 9b1. Worm mounting hole; 9c. First ear portion; 9d. Second ear portion; 9e. Connecting hole. Detailed Implementation Manner

[0034] The following are specific embodiments of the present invention and in conjunction with the drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0035] Such as Figure 1 and Figure 2As shown in the figure, a fixture for the housing of a worm and worm gear reducer includes a fourth shaft 1 with a cross plate 1a and a positioning assembly 2 fixed to the cross plate 1a. A first pressing member 3 and a second pressing member 4 are also fixed to the cross plate 1a, and the first pressing member 3 and the second pressing member 4 are distributed along the length direction of the cross plate 1a. The positioning assembly 2 includes four positioning posts 5 and two floating support cylinders 6. The four positioning posts 5 are located at the vertices of a rectangle with the same length direction as the cross plate 1a. The upper end of the positioning post 5 has a positioning head 5a with an outer diameter smaller than other positions of the positioning post 5. The two floating support cylinders 6 are located in the area between the four positioning posts 5. The two floating support cylinders 6 are distributed along the length direction of the cross plate 1a and are located between the first pressing member 3 and the second pressing member 4. Further, the positioning assembly 2 also includes two positioning blocks 7. One positioning block 7 is located between two of the positioning posts 5 along the length direction of the cross plate 1a, and the other positioning block 7 is located between the remaining two positioning posts 5 along the length direction of the cross plate 1a. The two positioning blocks 7 are arranged opposite to each other along the width direction of the cross plate 1a. The upper ends of the two positioning blocks 7 have arc-shaped positioning surfaces 7a on the opposite sides. The two positioning surfaces 7a are concentrically arranged and have the same radius.

[0036] In this embodiment, the cross plate 1a is fixedly connected with a mounting plate 8 through fasteners, and the positioning assembly 2, the first pressing member 3 and the second pressing member 4 are all fixed to the mounting plate 8. The mounting plate 8, the positioning assembly 2, the first pressing member 3 and the second pressing member 4 form a small module, which means that in practice, corresponding such small modules can be configured for different specifications of the housing 9 respectively. Thus, when clamping and fixing different specifications of the housing 9, only the corresponding small module needs to be replaced.

[0037] Among them, as Figure 1 and Figure 2 shown, the first pressing member 3 includes a first acting cylinder 3a and a first pressing block driven by the first acting cylinder 3a to move up and down. Specifically, the first pressing block 3b is arranged in a long strip shape along the length direction of the cross plate 1a. The first pressing member 3 also includes a first connecting rod 3c1. One end of the first pressing block 3b away from the second pressing member 4 is hinged to the upper end of the piston rod of the first acting cylinder 3a (the end of the first pressing block 3b can be set in a U shape, and the upper end of the piston rod of the first acting cylinder 3a is located in the opening and then hinged with a pin shaft). One end of the first connecting rod 3c1 is hinged to the cylinder body of the first acting cylinder 3a (a hinged part can be set at the upper end of the cylinder body of the first acting cylinder 3a to cooperate with the hinge), and the other end of the first connecting rod 3c1 is hinged to the middle part of the first pressing block 3b along the length direction of the cross plate 1a.

[0038] As Figure 1 、 Figure 2 and Figure 3 ​As shown in the figure, the second pressing member 4 includes a second acting oil cylinder 4a and a second pressing block 4b driven by the second acting oil cylinder 4a to move up and down. One end of the second pressing block 4b close to the first pressing block 3b has two pressing portions 4b1. A relief groove 4b2 is formed between the two pressing portions 4b1 along the width direction of the bridge plate 1a. The second pressing block 4b has a strip-shaped transition portion 4b3 arranged along the width direction of the bridge plate 1a. The two pressing portions 4b1 are respectively located at both ends of the transition portion 4b3 and protrude towards the direction close to the first pressing member 3. The two pressing portions 4b1 are both inclined with respect to the transition portion 4b3. The inclination angles of the two pressing portions 4b1 are the same and the inclination directions are opposite. The distance between the two pressing portions 4b1 gradually decreases along the direction away from the first pressing member 3. Specifically, the second pressing member 4 further includes a second connecting rod 4c. The second pressing block 4b further has a strip-shaped connecting portion 4b4 arranged along the length direction of the bridge plate 1a. One end of the transition portion 4b3 is connected to the connecting portion 4b4. The other end of the connecting portion 4b4 is hinged to the upper end of the piston rod of the second acting oil cylinder 4a (the end portion of the connecting portion 4b4 can be set in a U shape, and the upper end of the piston rod of the second acting oil cylinder 4a is located inside the opening and then hinged with a pin shaft). One end of the second connecting rod 4c is hinged to the cylinder block of the second acting oil cylinder 4a (a hinge portion can be provided at the upper end of the cylinder block of the second acting oil cylinder 4a to cooperate with the hinge), and the other end of the second connecting rod 4c is hinged to the connecting portion 4b4.

[0039] During use, the housing 9 is abutted against the positioning assembly 2 with the boss 9a2 facing downwards. Specifically: the four connecting holes 9e of the housing 9 are sleeved on the positioning heads 5a, so that the first ears 9c and the second ears 9d are abutted against the positioning columns 5 respectively. The outer circle of the boss 9a2 is centered by abutting against the positioning surface 7a on the opposite side of the two positioning blocks 7, so that both the center of the circle is determined and the circumferential positioning of the housing 9 is realized at the same time. In addition, the worm mounting portion 9b abuts against one of the floating support oil cylinders 6, and the worm gear mounting portion 9a abuts against the other floating support oil cylinder 6. The two floating support oil cylinders 6 can provide more support force, thus avoiding vibration during boring and affecting the boring accuracy.

[0040] After the placement is completed, the housing 9 is pressed by the first pressing member 3 and the second pressing member 4 along the direction perpendicular to the bridge plate 1a. Specifically, the piston rod of the first acting oil cylinder 3a drives the first pressing block 3b to move downwards and press on the worm mounting portion 9b of the housing 9. At the same time, the piston rod of the second acting oil cylinder 4a drives the second pressing block 4b to move downwards. The two pressing portions 4b1 of the second pressing block 4b press on the two first ears 9c (the relief groove 4b2 between the two pressing portions 4b1 provides a clearance for the outer circle of the worm gear mounting portion 9a to avoid interference with the pressing of the two pressing portions 4b1). The final state after clamping and fixing is as Figure 4 shown.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar ways of substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. A fixture for a housing of a worm gear reducer, comprising a fourth shaft (1) having a bridge plate (1a) and a positioning assembly (2) fixed on the bridge plate (1a), characterized in that: The bridge plate (1a) is fixed with a clamping piece 1 (3) and a clamping piece 2 (4), which are distributed along the length direction of the bridge plate (1a). The clamping piece 1 (3) includes an acting cylinder 1 (3a) and a clamping block 1 (3b) driven by the acting cylinder 1 (3a) to move up and down. The clamping piece 2 (4) includes an acting cylinder 2 (4a) and a clamping block 2 (4b) driven by the acting cylinder 2 (4a) to move up and down. The clamping block 2 (4b) has two clamping parts (4b1) at one end close to the clamping block 1 (3b), and a clearance groove (4b2) is formed between the two clamping parts (4b1) along the width direction of the bridge plate (1a).

2. The fixture for the housing of a worm gear reducer according to claim 1, characterized in that: The second pressing block (4b) has a transition portion (4b3) in the form of a long strip arranged along the width direction of the bridge plate (1a), and the two clamping portions (4b1) are respectively located at the two ends of the transition portion (4b3) and protrude in a direction close to the clamping piece (3).

3. The fixture for the housing of a worm gear reducer according to claim 2, characterized in that: The two clamping parts (4b1) are both arranged to be inclined relative to the transition part (4b3), the two clamping parts (4b1) have the same inclination angle and opposite inclination directions, and the distance between the two clamping parts (4b1) gradually decreases in a direction away from the clamping member 1 (3).

4. The fixture for the housing of a worm gear reducer according to claim 3, characterized in that: The clamping member 2 (4) also includes a connecting rod 2 (4c), and the pressure block 2 (4b) also has a long strip-shaped connecting portion (4b4) arranged along the length direction of the bridge plate (1a), the transition portion (4b3) is connected to one end of the connecting portion (4b4), and the other end of the connecting portion (4b4) is hinged to the upper end of the piston rod of the acting cylinder 2 (4a), one end of the connecting rod 2 (4c) is hinged to the cylinder body of the acting cylinder 2 (4a), and the other end of the connecting rod 2 (4c) is hinged to the connecting portion (4b4).

5. The fixture for the housing of a worm gear reducer according to claim 1, characterized in that: The pressure block 1 (3b) is arranged in a long strip shape along the length direction of the bridge plate (1a), and the clamping member 1 (3) also includes a connecting rod 1 (3c). One end of the pressure block 1 (3b) away from the clamping member 2 (4) is hinged to the upper end of the piston rod of the acting cylinder 1 (3a), one end of the connecting rod 1 (3c) is hinged to the cylinder body of the acting cylinder 1 (3a), and the other end of the connecting rod 1 (3c) is hinged to the middle part of the pressure block 1 (3b) along the length direction of the bridge plate (1a).

6. The fixture for the housing of a worm gear reducer according to claim 1, 2, 3, 4 or 5, characterized in that: The positioning assembly (2) comprises four positioning columns (5) and two positioning blocks (7), the four positioning columns (5) being located at the vertices of a rectangle having the same length direction as the bridge plate (1a), the upper end of the positioning column (5) having a positioning head (5a) having an outer diameter smaller than that of other positions of the positioning column (5), one of the positioning blocks (7) being located between two of the positioning columns (5) along the length direction of the bridge plate (1a), the other positioning block (7) being located between the remaining two positioning columns (5) along the length direction of the bridge plate (1a), the two positioning blocks (7) being arranged opposite to each other along the width direction of the bridge plate (1a), the upper ends of the two positioning blocks (7) both having arc-shaped positioning surfaces (7a), the two positioning surfaces (7a) being arranged concentrically and having the same radius.

7. The fixture for the housing of a worm gear reducer according to claim 6, characterized in that: The positioning assembly (2) further comprises two floating support cylinders (6), the two floating support cylinders (6) are located in the area between the four positioning columns (5), and the two floating support cylinders (6) are distributed along the length direction of the bridge plate (1a) and are located between the clamping member 1 (3) and the clamping member 2 (4).

8. The fixture for the housing of a worm gear reducer according to claim 7, characterized in that: The bridge plate (1a) is fixedly connected to a mounting plate (8) via fasteners, and the positioning assembly (2), the first clamping member (3) and the second clamping member (4) are all fixed on the mounting plate (8).

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