A drilling positioning device for a keyless sprocket

Abstract

A drilling and positioning device for a keyless sprocket, relating to the field of sprocket machining technology, includes a main body plate, a positioning plate, a drill bushing, a positioning shaft, and a locking nut. The main body plate has an inverted T-shaped structure, with its horizontal section fixedly connected to the worktable of a vertical drilling machine, and its top vertical section fixedly connected to the positioning plate. A vertically arranged drill bushing is fixedly mounted on the positioning plate, and the positioning shaft passes through the vertical section below the drill bushing. The positioning shaft, via the locking nut, fixes the keyless sprocket to be machined relative to the vertical section. The position to be drilled on the boss of the keyless sprocket is vertically aligned with the drill bushing. This invention provides a simple, easy-to-use, and highly accurate drilling and positioning fixture for keyless sprocket bosses.

Description

Technical Field

[0001] This invention relates to the field of sprocket processing technology, specifically to a drilling and positioning device for a keyless sprocket. Background Technology

[0002] Keyless sprockets are typically used as driven sprockets on equipment, serving to support and assist in transmission without exerting driving force themselves.

[0003] like Figure 1 As shown, a keyless sprocket typically has an outwardly protruding annular boss on one side of its center hole. The inner hole of the annular boss is integrally formed with the center hole, allowing the shaft to pass through. A radially penetrating threaded hole is usually provided on the side wall of the boss. The boss and shaft are fixed together by positioning bolts, replacing the traditional keyway fit. Sometimes, the threaded hole penetrates the side wall of the boss, rather than just the inner surface. High precision is required when machining the threaded hole, and positioning the sprocket on a vertical drilling machine is a necessary prerequisite for achieving high-precision machining. Therefore, there is an urgent need for a simple, easy-to-use, and highly accurate drilling and positioning fixture for keyless sprockets. Utility Model Content

[0004] This invention discloses a drilling positioning device for a keyless sprocket to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this invention is as follows:

[0006] A drilling positioning device for a keyless sprocket includes a main body plate, a positioning plate, a drill bushing, a positioning shaft, and a locking nut. The main body plate has an inverted T-shaped structure, with its horizontal section fixedly connected to the worktable of a vertical drilling machine and its top vertical section fixedly connected to the positioning plate. A vertically arranged drill bushing is fixedly mounted on the positioning plate, and the positioning shaft passes through the vertical section below the drill bushing. The positioning shaft fixes the keyless sprocket to be processed relative to the vertical section through the locking nut. The drilling position on the boss of the keyless sprocket to be processed is vertically aligned with the drill bushing.

[0007] Preferably, multiple sets of positioning units are arranged on the vertical section. Each positioning unit includes a positioning groove at the top of the vertical section and a positioning shaft mounting hole below the positioning groove. The positioning shaft mounting hole is provided with a keyway structure, and the bottom of the positioning groove is provided with a threaded blind hole. Multiple sets of positioning units are arranged side by side and used to perform threaded hole machining on the bosses of multiple sprockets.

[0008] Preferably, the positioning plate includes a plate body, and a right-angled groove is provided on one side of the outer surface of the plate body. The right-angled groove passes through the front and rear ends and the side ends of the plate body. The bottom of the right-angled groove and the plate body on one side of the right-angled groove are provided with through holes and a first mounting hole side by side. The plate body is snapped onto the positioning groove through the right-angled groove and fixedly connected to the threaded blind hole by a positioning bolt passing through the through hole.

[0009] Preferably, the drill bushing includes a tubular drill bushing body and an annular limiting plate fixedly connected to the top of the drill bushing body. The drill bushing body is interference-fitted with the first mounting hole, and the annular limiting plate overlaps the plate surface where the top of the first mounting hole is located.

[0010] Preferably, the positioning shaft includes a first shaft segment, a second shaft segment, a third shaft segment, and a fourth shaft segment that are coaxial and integrally connected in sequence. The outer walls of the first and fourth shaft segments are respectively provided with external threads. The outer wall of the second shaft segment is provided with a protrusion that mates with the keyway structure. The third shaft segment is used to install a keyless sprocket. The first and fourth shaft segments are respectively screwed with lock nuts. When the two lock nuts are tightened, the keyless sprocket is fixed between the outer surface of the vertical segment and the lock nut on the same side. The inner hole of the drill bushing and the position of the threaded hole to be processed are coaxial and vertically aligned.

[0011] Preferably, it also includes a locating pin, and a second mounting hole is provided on the vertical section below the mounting hole of the locating shaft. The locating pin passes through the second mounting hole and is used to engage with the bottom tooth groove of the keyless sprocket to be processed.

[0012] Preferably, when the threaded hole on the keyless sprocket boss is a threaded hole that passes through the boss, the third shaft segment is provided with a vertically penetrating positioning hole, which is coaxial with the position of the hole to be drilled and allows the drill bit of the vertical drilling machine to pass through.

[0013] The drilling and positioning device for a keyless sprocket of this invention has the following advantages:

[0014] 1. The drill bushing serves to guide the drill bit and is removable. It can be removed and replaced after prolonged use and wear. The positioning shaft secures the workpiece to the keyless sprocket. The workpiece is mounted on the positioning shaft, rotated to the desired machining position, and then locked using the lock nut. The positioning pin positions the threaded hole. If the threaded hole needs to align vertically with the tooth grooves at the bottom of the keyless sprocket, the positioning pin can be inserted into the bottommost tooth groove.

[0015] 2. The workpiece is fixed on the positioning shaft without the use of a key or keyway mating structure. After positioning, the workpiece is drilled and tapped to make threaded holes. Due to the high positioning accuracy, the drilling accuracy is also guaranteed. The workpiece is installed on the positioning shaft and can be positioned by the positioning pin to make the threaded hole processed at a specific position. Moreover, the positioning plate, drill bushing, positioning shaft and positioning pin can all be disassembled and replaced, which increases the diversity of workpiece processing and the replaceability of the processing device after wear.

[0016] 3. This new design is reasonable and simple in structure, possessing numerous advantages such as economy, ease of use, interchangeability, convenient installation, and long service life. Multiple positioning units are set on the main plate, enabling the machining of multiple sprockets on a single plate through the installation of positioning plates, drill bushings, positioning shafts, and positioning pins. Attached Figure Description

[0017] Figure 1 This is a side sectional view of the overall assembly structure of this novel invention;

[0018] Figure 2 This is a front view structural diagram of the main panel;

[0019] Figure 3 This is a side view of the main body panel.

[0020] Figure 4 This is a schematic diagram of the front cross-sectional structure of the positioning plate;

[0021] Figure 5 This is a schematic diagram of the positioning plate from below.

[0022] Figure 6 This is a schematic diagram of the drill bushing structure;

[0023] Figure 7 This is a schematic diagram of the positioning shaft.

[0024] Figure 8 This is a structural diagram of a locating pin.

[0025] Reference numerals: 1. Main plate; 101. Horizontal section; 102. Vertical section; 103. Positioning shaft mounting hole; 104. Positioning groove; 105. Threaded blind hole; 106. Second mounting hole; 107. Sprocket; 108. Weld; 2. Positioning plate; 201. Right-angle groove; 202. Through hole; 203. First mounting hole; 3. Drill bushing; 301. Drill bushing body; 302. Annular limiting plate; 4. Positioning shaft; 401. First shaft section; 402. Second shaft section; 403. Third shaft section; 4031. Positioning hole; 404. Fourth shaft section; 5. Positioning pin; 6. Locking nut; 7. Keyless sprocket; 701. Boss; 702. Drilling position. Detailed Implementation

[0026] The following is a detailed description of the embodiments of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this invention.

[0028] This invention relates to a drilling positioning device for a keyless sprocket, such as... Figure 1-8 As shown, the system includes a main body plate 1, a positioning plate 2, a drill sleeve 3, a positioning shaft 4, and a locking nut 6. The main body plate is an inverted T-shaped structure. Its horizontal section 101 is used to fix it to the worktable of the vertical drilling machine, and the top of its vertical section 102 is used to fix it to the positioning plate 2. The positioning plate 2 is fixedly provided with a vertically arranged drill sleeve 3. The positioning shaft 4 passes through the vertical section 102 below the drill sleeve 3. The positioning shaft 4 fixes the keyless sprocket 7 to be processed to the vertical section 102 relative to the positioning shaft 4 through the locking nut 6. The drilling position 702 on the boss 701 of the keyless sprocket 7 to be processed is vertically opposite to the drill sleeve 3.

[0029] Furthermore, in this embodiment, as Figure 2 , 3 As shown, multiple sets of positioning units are arranged on the vertical section 102. Each positioning unit includes a positioning groove 104 located at the top of the vertical section and a positioning shaft mounting hole 103 located below the positioning groove 104. The positioning shaft mounting hole 103 is provided with a keyway structure, and the bottom of the positioning groove 104 is provided with a threaded blind hole 105. Multiple sets of positioning units are arranged side by side and used to perform threaded hole machining on the bosses of multiple sprockets 107.

[0030] Furthermore, in this embodiment, as Figure 4 , 5 As shown, the positioning plate 2 includes a plate body. A right-angled groove 201 is provided on one side of the outer surface of the plate body. The right-angled groove 201 extends through the front and rear ends and the side end of the plate body. A through hole 202 and a first mounting hole 203 are arranged side-by-side on the bottom of the right-angled groove 201 and on one side of the plate body. The plate body is engaged with the positioning groove 104 via the right-angled groove 201 and fixedly connected to the threaded blind hole 105 by a positioning bolt passing through the through hole 202. Figure 1As shown, after the positioning plate is snapped into place and fixed to the positioning groove with bolts, the plate is in a horizontal position, the axis of the first mounting hole is vertical, and it is used to install the drill bushing.

[0031] Furthermore, in this embodiment, as Figure 1 , 6 As shown, the drill sleeve 3 includes a tubular drill sleeve body 301 and an annular limiting plate 302 fixedly connected to the top of the drill sleeve body 301. The drill sleeve body 301 is interference-fitted with the first mounting hole 203, and the annular limiting plate 302 overlaps the plate surface where the top of the first mounting hole 203 is located. The drill sleeve is used to guide the drill bit to ensure the accuracy of the drilling position. During drilling, the drill bit on the drilling machine descends through the drill sleeve and contacts the surface of the boss.

[0032] Furthermore, in this embodiment, as Figure 1 , 7 As shown, the positioning shaft 4 includes a first shaft segment 401, a second shaft segment 402, a third shaft segment 403, and a fourth shaft segment 404 that are coaxial and integrally connected in sequence. The outer walls of the first shaft segment 401 and the fourth shaft segment 404 are respectively provided with external threads. The outer wall of the second shaft segment 402 is provided with a protrusion that mates with the keyway structure. The third shaft segment 403 is used to install a keyless sprocket 7. The first shaft segment 401 and the fourth shaft segment 404 are respectively screwed with locking nuts 6. When the two locking nuts 6 are locked, the keyless sprocket 7 is fixed between the outer surface of the vertical segment 102 and the locking nut 6 on the same side. The inner hole of the drill bushing 3 is coaxial with the position 702 to be drilled and is vertically aligned.

[0033] Furthermore, in this embodiment, as Figure 1 , 8 As shown, it also includes a positioning pin 5. A second mounting hole 106 is provided on the vertical section 102 below the positioning shaft mounting hole 103. The positioning pin 5 passes through the second mounting hole 106 with an interference fit and is used to engage with the bottom tooth groove of the keyless sprocket 7 to be processed. At this time, the bottom tooth groove and the drilling position 702 are in an upper-lower correspondence.

[0034] Furthermore, in this embodiment, as Figure 1 , 7 As shown, when the threaded hole on the keyless sprocket boss is a through-hole threaded hole, the third shaft section 403 is provided with a vertically penetrating positioning hole 4031. The positioning hole 4031 is coaxial with the drilling position 702 and allows the drill bit to pass through. Figure 1 As shown, the drill bit descends through the drill bushing, drills out the threaded hole at the top of the boss, then passes down through the positioning hole and continues to drill out the threaded hole on the lower side of the boss, forming a threaded hole that runs through the boss.

[0035] The working principle of this new type is as follows: The horizontal section of the main body plate is fixed on the worktable of the vertical drilling machine. The right-angle groove of the positioning plate is engaged with the positioning groove at the top of the vertical section and fixed with an internal hexagon positioning bolt. The drill bushing is pressed into the first mounting hole. The positioning shaft passes through the positioning shaft mounting hole and is prevented from rotating by the cooperation of the protrusion and the keyway structure. The keyless sprocket is sleeved on the third shaft section. The position to be drilled is rotated so that it is vertically aligned with the drill bushing. The locking nuts on both sides are tightened. At this time, the keyless sprocket is fixed. If it is necessary for the threaded hole to be aligned with the tooth groove at the bottom of the keyless sprocket, a positioning pin is inserted into the second mounting hole and locked into the bottom tooth groove. This prevents the keyless sprocket from moving radially and ensures that the bottom tooth groove is vertically aligned with the position to be drilled. Finally, the vertical drilling machine is started, and the drill bit passes through the drill bushing to process the threaded hole of the boss. If it is necessary to process a threaded hole that passes through the boss, the drill bit further passes through the positioning hole to continue processing the threaded hole at the bottom of the boss.

Claims

1. A drilling positioning device for a keyless sprocket, characterized in that: The system includes a main body plate, a positioning plate, a drill bushing, a positioning shaft, and a locking nut. The main body plate is an inverted T-shaped structure. Its horizontal section is fixedly connected to the worktable of a vertical drilling machine, and the top of its vertical section is fixedly connected to the positioning plate. A vertically arranged drill bushing is fixedly mounted on the positioning plate. A positioning shaft passes through the vertical section below the drill bushing. The positioning shaft fixes the keyless sprocket to be processed relative to the vertical section through the locking nut. The position of the hole to be drilled on the boss of the keyless sprocket to be processed is vertically aligned with the drill bushing.

2. The drilling and positioning device for a keyless sprocket as described in claim 1, characterized in that: Multiple positioning units are arranged on the vertical section. Each positioning unit includes a positioning groove at the top of the vertical section and a positioning shaft mounting hole below the positioning groove. The positioning shaft mounting hole is provided with a keyway structure, and the bottom of the positioning groove is provided with a threaded blind hole. Multiple positioning units are arranged side by side and used to perform threaded hole machining on the bosses of multiple sprockets.

3. The drilling positioning device for a keyless sprocket as described in claim 2, characterized in that: The positioning plate includes a plate body, and a right-angled groove is provided on one side of the outer surface of the plate body. The right-angled groove passes through the front and rear ends and the side ends of the plate body. The bottom of the right-angled groove and the plate body on one side of the right-angled groove are provided with through holes and a first mounting hole. The plate body is snapped onto the positioning groove through the right-angled groove and fixedly connected to the threaded blind hole by a positioning bolt passing through the through hole.

4. The drilling and positioning device for a keyless sprocket as described in claim 3, characterized in that: The drill bushing includes a tubular drill bushing body and an annular limiting plate fixedly connected to the top of the drill bushing body. The drill bushing body is interference-fitted with the first mounting hole, and the annular limiting plate overlaps the plate surface where the top of the first mounting hole is located.

5. The drilling and positioning device for a keyless sprocket as described in claim 4, characterized in that: The positioning shaft includes a first shaft segment, a second shaft segment, a third shaft segment, and a fourth shaft segment that are coaxial and integrally connected in sequence. The outer walls of the first and fourth shaft segments are respectively provided with external threads. The outer wall of the second shaft segment is provided with a protrusion that mates with the keyway structure. The third shaft segment is used to install a keyless sprocket. The first and fourth shaft segments are respectively screwed with lock nuts. When the two lock nuts are tightened, the keyless sprocket is fixed between the outer surface of the vertical segment and the lock nut on the same side. The inner hole of the drill bushing and the position of the threaded hole to be processed are coaxial and vertically aligned.

6. The drilling and positioning device for a keyless sprocket as described in claim 5, characterized in that: It also includes a locating pin, and a second mounting hole is provided on the vertical section below the mounting hole of the locating shaft. The locating pin passes through the second mounting hole and is used to engage with the bottom tooth groove of the keyless sprocket to be processed.

7. The drilling and positioning device for a keyless sprocket as described in claim 6, characterized in that: When the threaded hole on the keyless sprocket boss is a threaded hole that passes through the boss, the third shaft section is provided with a positioning hole that runs vertically through it. The positioning hole is coaxial with the position of the hole to be drilled and allows the drill bit of the vertical drilling machine to pass through.

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