Spring snap ring assembly machine

Abstract

The utility model relates to a spring snap ring assembly machine which comprises a bottom plate, a conveying mechanism and a press-fitting mechanism, wherein the conveying mechanism and the press-fitting mechanism are installed on the bottom plate. The conveying mechanism comprises a conveying support, a long-strip-shaped conveying hole is formed in the top of the conveying support, a conveying block is slidably installed in the long-strip-shaped conveying hole, and a containing groove is formed in the conveying block. The press-fitting mechanism comprises a press-fitting support, the press-fitting support is fixed to the bottom plate, a press-fitting block is slidably mounted on the side face of the press-fitting support, a containing cavity is formed in the bottom of the press-fitting block, a guide column is arranged in the containing cavity, a plug pin is fixed to the bottom of the guide column, a limiting ring groove is formed in the outer side of the upper portion of the guide column, and a limiting rod slidably penetrates through a side arm of the containing cavity. The end, close to the guide column, of the limiting rod is of a U-shaped structure. After the diameter of the spring snap ring on the big-end-down guide post is increased, the spring snap ring can be easily sleeved in the bearing, so that the spring snap ring and the bearing are assembled, the labor intensity of workers is greatly reduced, the working efficiency is improved, and the time consumed by assembly is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearing production, in particular to a spring clamp ring assembly machine. Background Art

[0002] In the production process of bearings, Figure 1 As shown, the spring snap ring 2 (C type) needs to be installed in the annular groove 11 of the bearing 1. However, the installation of the spring snap ring is still done manually, that is, workers need to use a lot of force to pull the spring snap ring open before installing it into the annular groove of the bearing. This installation method is labor-intensive, time-consuming and has low work efficiency. Utility Model Content

[0003] The main purpose of the utility model is to provide a spring clamp ring assembly machine, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A spring snap ring assembly machine comprises a base plate and a transport mechanism and a press mechanism mounted on the base plate;

[0006] The transport mechanism comprises a transport bracket, the transport bracket is fixed on the bottom plate, a long transport hole is provided on the top of the transport bracket, a transport block is slidably installed in the long transport hole, a placement groove is provided on the transport block, and the placement groove is used to place the bearing;

[0007] The press-fitting mechanism includes a press-fitting support, which is fixed on the bottom plate. A press-fitting block is slidably installed on the side of the press-fitting support. A accommodating cavity is provided at the bottom of the press-fitting block. A guide column is arranged in the accommodating cavity. The guide column is a truncated cone structure which is small at the top and large at the bottom. A latch is fixed at the bottom of the guide column. A limiting ring groove is provided on the upper outer side of the guide column. A limiting rod is slidably penetrated in the side arm of the accommodating cavity. The end of the limiting rod close to the guide column is a U-shaped structure. The U-shaped structure of the limiting rod can be inserted into the limiting ring groove to limit and fix the guide column in the accommodating cavity.

[0008] Optionally, a first driving mechanism is provided at the bottom of the transport bracket for driving the transport block to move in the long transport hole, a second driving mechanism is provided on the press-fitting support for driving the press-fitting block to move up and down, and a third driving mechanism is provided on the outer side of the press-fitting block for driving the limit rod to move left and right.

[0009] Optionally, it also includes a product loading mechanism, which includes a first loading bracket, the first loading bracket is fixed on the base plate, a feeding trough is formed on the top of the first loading bracket, a feeding notch is formed on the top of the transport bracket corresponding to the feeding trough, a first mounting seat is fixed on the top of the first loading bracket, a first loading rod is arranged on the first mounting seat, the top of the first loading rod is detachably fixedly connected to the first mounting seat, and the bottom is suspended, the first loading rod is used to sleeve a plurality of bearings, and the bottom bearing automatically falls into the feeding trough under the action of gravity, a push rod is slidably installed in the feeding trough, and a fourth driving mechanism is arranged on the first loading bracket for driving the push rod to move in the feeding trough.

[0010] Optionally, the first mounting seat includes two first mounting rods, the bottoms of the two first mounting rods are fixedly connected to the first loading bracket, a first mounting block is fixed on the top, a first countersunk hole is opened on the top of the first mounting block, and a first limiting block is fixed on the top of the first loading rod, and the first limiting block can be embedded in the first countersunk hole.

[0011] Optionally, it also includes a steel ring feeding mechanism, which includes a telescopic cylinder, a second feeding bracket is fixed to the top of the output shaft of the telescopic cylinder, a mounting groove is formed on the top of the second feeding bracket, a pushing block is slidably installed in the mounting groove, the front end of the pushing block is a U-shaped structure, and a U-shaped groove is formed on the top of the U-shaped structure of the pushing block, a second mounting seat is fixed to the top of the second feeding bracket, a second feeding rod is arranged on the second mounting seat, the top of the second feeding rod is detachably fixedly connected to the second mounting seat, and the bottom is suspended, the second feeding rod is used to cover a plurality of spring retaining rings, and the bottom spring retaining ring automatically falls into the U-shaped groove under the action of gravity, and a fifth driving mechanism is provided on the second feeding bracket, which is used to drive the pushing block to move in the mounting groove.

[0012] Optionally, the second mounting seat includes two second mounting rods, the bottoms of the two second mounting rods are fixedly connected to the second loading bracket, a second mounting block is fixed on the top, a second countersunk hole is opened on the top of the second mounting block, and a second limit block is fixed on the top of the second loading rod, and the second limit block can be embedded in the second countersunk hole.

[0013] The utility model provides a spring clamp assembly machine, which has the following beneficial effects:

[0014] The utility model uses a press-fitting block to completely insert the pin at the bottom of the guide column into the bearing to complete the alignment of the guide column and the bearing. After the spring clamping ring is sleeved on the guide column, the spring clamping ring is pressed down by the press-fitting block. After the diameter of the spring clamping ring becomes larger on the guide column with a small upper part and a large lower part, it is easily sleeved into the bearing to complete the assembly of the spring clamping ring and the bearing. The whole process does not require manual pulling of the spring clamping ring, and can realize automatic operation, which can greatly reduce the labor intensity of workers, improve work efficiency, and reduce the time consumed in assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a spring retaining ring provided on a bearing sleeve of the utility model;

[0016] Figure 2 The structure diagram of the automatic spring clamping ring device for bearings of the utility model is shown in FIG. Figure 1 ;

[0017] Figure 3 The structure diagram of the automatic spring clamping ring device for bearings of the utility model is shown in FIG. Figure 2 ;

[0018] Figure 4 The structure diagram of the automatic spring clamping ring device for bearings of the utility model is shown in FIG. Figure 3 ;

[0019] Figure 5 It is a structural schematic diagram of the transport mechanism and the pressing mechanism of the utility model;

[0020] Figure 6 This is a schematic diagram of the internal structure of the transport press block of the utility model;

[0021] Figure 7 This is a schematic diagram of the connection between the transport pressing block and the limit rod of the utility model;

[0022] Figure 8 It is a structural schematic diagram of the feeding mechanism of the utility model product;

[0023] Fig. 9 It is a structural schematic diagram of the first mounting seat and the second mounting seat of the utility model;

[0024] Fig.10 The structure diagram of the steel ring feeding mechanism of the utility model is shown in FIG. Figure 1 ;

[0025] Fig.11 The structure diagram of the steel ring feeding mechanism of the utility model is shown in FIG. Figure 2 .

[0026] In the figure:

[0027] 1. Bearing; 2. Spring snap ring;

[0028] 10. Bottom plate;

[0029] 20. Transport mechanism; 201. Transport bracket; 202. Long transport hole; 203. Transport block; 204. Feeding notch;

[0030] 30. Press-fitting mechanism; 301. Press-fitting support; 302. Press-fitting block; 303. Accommodating cavity; 304. Guide column; 305. Latch; 306. Limiting ring groove; 307. Limiting rod;

[0031] 40. Product feeding mechanism; 401. First feeding bracket; 402. Feeding trough; 403. First mounting seat; 404. First feeding rod; 405. Push rod; 406. Fourth driving mechanism; 4031. First mounting rod; 4032. First mounting block; 4033. First countersunk hole; 4034. First limit block;

[0032] 50. Steel ring feeding mechanism; 501. Telescopic cylinder; 502. Second feeding bracket; 503. Mounting groove; 504. Pushing block; 505. U-shaped groove; 506. Second mounting seat; 507. Second feeding rod; 508. Fifth driving mechanism; 5061. Second mounting rod; 5062. Second mounting block; 5063. Second countersunk hole; 5064. Second limiting block. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the utility model.

[0034] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] Example

[0038] Reference Figure 2-4 , a spring snap ring assembly machine, comprising a base plate 10 and a transport mechanism 20 and a press mechanism 30 mounted on the base plate 10;

[0039] Reference Figure 5 The transport mechanism 20 includes a transport bracket 201, the transport bracket 201 is fixed on the bottom plate 10, a long transport hole 202 is provided on the top of the transport bracket 201, a transport block 203 is slidably installed in the long transport hole 202, and a placement groove is provided on the transport block 203, and the placement groove is used to place the bearing 1;

[0040] The two ends of the placement groove are connected, and the inside is set in a stepped shape according to the bottom structure of the bearing, which is just enough to limit the placement of the bearing. When the transport block 203 drives the bearing 1 to move, the bearing will not shake easily;

[0041] Reference Figure 5-7 The press-fitting mechanism 30 includes a press-fitting support 301, which is fixed on the bottom plate 10. A press-fitting block 302 is slidably installed on the side of the press-fitting support 301. A receiving cavity 303 is provided at the bottom of the press-fitting block 302. A guide column 304 is provided in the receiving cavity 303. The guide column 304 is a truncated cone structure with a small upper part and a large lower part. A latch 305 is fixed to the bottom of the guide column 304. A limiting ring groove 306 is provided on the outer side of the upper part of the guide column 304. A limiting rod 307 is slidably penetrated in the side arm of the receiving cavity 303. The end of the limiting rod 307 close to the guide column 304 is a U-shaped structure. The U-shaped structure of the limiting rod 307 can be inserted into the limiting ring groove 306 to limit and fix the guide column 304 in the receiving cavity 303.

[0042] The transport block 203 moves in the long transport hole 202. The end of the long transport hole 202 close to the press-fitting support 301 is the press-fitting work position. The position of the press-fitting block 302 corresponds to the press-fitting work position. The end of the long transport hole 202 away from the press-fitting support 301 is the loading work position.

[0043] The guide column 304 is a truncated cone structure with a small top and a large bottom. The diameter of the bottom of the guide column is the same as or slightly larger than the diameter of the bearing 1 . The latch pin 305 at the bottom of the guide column 304 is slightly smaller than the middle hole of the bearing 1 .

[0044] During operation, first, the transport block 203 moves to the loading position, and the bearing 1 is placed in the placement slot of the transport block 203. The transport block 203 drives the bearing 1 to move to the press-fitting position, and the press-fitting block 302 moves downward on the press-fitting support 301, driving the guide column 304 to move downward until the latch 305 at the bottom of the guide column 304 is completely inserted into the bearing 1, and then the limit rod 307 moves outward to release the limit on the guide column 304. After the press-fitting block 302 moves upward on the press-fitting support 301, the guide column 304 stays on the bearing 1, and the guide column 304 and the bearing 1 are aligned. Then the spring retaining ring 2 is sleeved on the guide column 304. The press-fitting block 302 moves downward again, and the press-fitting block 302 continues to move downward against the spring retaining ring 2. The diameter of the spring retaining ring 2 gradually increases in the guide column 304 due to its own elastic effect. The spring retaining ring 2 with an increased diameter can be easily inserted into the bearing 1, and then automatically shrinks and snaps into the annular groove when it reaches the annular groove 11 of the bearing 1, completing the automatic assembly of the spring retaining ring 2 and the bearing 1. Finally, the limiting rod 307 moves inward, and the U-shaped structure of the limiting rod 307 is inserted into the limiting annular groove 306 of the guide column 304. The press-fitting block 302 drives the guide column 304 to move upward to disengage the guide column 304 from the bearing 1, and the assembled bearing 1 can be taken out.

[0045] The utility model uses the press-fitting block 302 to completely insert the pin 305 at the bottom of the guide column 304 into the bearing 1 to complete the alignment of the guide column 304 and the bearing 1. After the spring snap ring 2 is sleeved on the guide column 304, the spring snap ring 2 is pressed down by the press-fitting block 302. After the diameter of the spring snap ring 2 becomes larger on the guide column 304 with a small top and a large bottom, it is easily sleeved into the bearing 1 to complete the assembly of the spring snap ring 2 and the bearing 1. The whole process does not require manual pulling of the spring snap ring 2, and can realize automatic operation, which can greatly reduce the labor intensity of workers, improve work efficiency, and reduce the time consumed in assembly.

[0046] In a specific embodiment, a first driving mechanism is provided at the bottom of the transport bracket 201 for driving the transport block 203 to move in the long transport hole 202; a second driving mechanism is provided on the press-fitting support 301 for driving the press-fitting block 302 to move up and down; a third driving mechanism is provided on the outer side of the press-fitting block 302 for driving the limit rod 307 to move left and right; the driving mechanism can adopt existing linear reciprocating mechanisms such as a screw slider mechanism and a telescopic cylinder. Different driving mechanisms can be selected according to specific installation requirements to realize the automatic operation of the device.

[0047] In a specific embodiment, referring to Figure 3 , Figure 8 , Fig. 9 , also includes a product loading mechanism 40, the product loading mechanism 40 includes a first loading bracket 401, the first loading bracket 401 is fixed on the bottom plate 10, a feeding trough 402 is opened on the top of the first loading bracket 401, a feeding notch 204 is opened on the top of the transport bracket 201 corresponding to the feeding trough 402, a first mounting seat 403 is fixed on the top of the first loading bracket 401, a first loading rod 404 is arranged on the first mounting seat 403, the top of the first loading rod 404 is detachably fixedly connected to the first mounting seat 403, and the bottom is suspended, the first loading rod 404 is used to sleeve a plurality of bearings 1, and the bottom bearing 1 automatically falls into the feeding trough 402 under the action of gravity, a push rod 405 is slidably installed in the feeding trough 402, and a fourth driving mechanism 406 is arranged on the first loading bracket 401, which is used to drive the push rod 405 to move in the feeding trough 402 to load.

[0048] Reference Fig. 9 The first loading rod 404 can be disassembled. The disassembled first loading rod 404 is convenient for sleeve installation of the unassembled bearing 1 for refilling. After the refilling is completed, the top of the first loading rod 404 is fixed to the first mounting seat 403 again. The bottom bearing 1 on the first loading rod 404 automatically falls into the feeding trough 402 under the action of gravity. When the transport block 203 is located at the loading working position, the fourth driving mechanism 406 drives the push rod 405 to move forward, and the bottom bearing 1 is sent along the feeding trough 402 and the feeding notch 204 to the placement groove of the transport block 203, completing the automatic loading of the bearing 1. After the push rod 405 is reset, the bottom bearing 1 on the first loading rod 404 will automatically fall into the feeding trough 402 under the action of gravity, waiting for the next loading.

[0049] In a specific embodiment, referring to Fig. 9The first mounting seat 403 includes two first mounting rods 4031, the bottoms of the two first mounting rods 4031 are fixedly connected to the first feeding bracket 401, and a first mounting block 4032 is fixed on the top. A first countersunk hole 4033 is opened on the top of the first mounting block 4032, and a first limiting block 4034 is fixed on the top of the first feeding rod 404. The first limiting block 4034 can be embedded in the first countersunk hole 4033. The way in which the first limiting block 4034 is embedded in the first countersunk hole 4033 allows the first feeding rod 404 to be removed at any time, which is convenient for replenishing materials.

[0050] In a specific embodiment, referring to Figure 3 , Fig.10 , Fig.11 , also includes a steel ring feeding mechanism 50, the steel ring feeding mechanism 50 includes a telescopic cylinder 501, a second feeding bracket 502 is fixed on the top of the output shaft of the telescopic cylinder 501, a mounting groove 503 is provided on the top of the second feeding bracket 502, a pusher block 504 is slidably installed in the mounting groove 503, the front end of the pusher block 504 is a U-shaped structure, a U-shaped groove 505 is provided on the top of the U-shaped structure of the pusher block 504, the top of the second feeding bracket 502 is fixed There is a second mounting seat 506, and a second loading rod 507 is arranged on the second mounting seat 506. The top of the second loading rod 507 is detachably fixedly connected to the second mounting seat 506, and the bottom is suspended. The second loading rod 507 is used to sleeve a plurality of spring retaining rings 2, and the bottom spring retaining ring 2 automatically falls into the U-shaped groove 505 under the action of gravity. The second loading bracket 502 is provided with a fifth driving mechanism 508, which is used to drive the pushing block 504 to move in the mounting groove 503.

[0051] Similarly, the second feeding rod 507 can also be disassembled. The disassembled first feeding rod 404 is convenient for sleeve mounting the spring snap ring 2 to be assembled for replenishing. After the replenishing is completed, the top of the second feeding rod 507 is fixed to the second mounting seat 506 again, and the spring snap ring 2 at the bottom of the second feeding rod 507 automatically falls into the U-shaped groove 505 under the action of gravity. When the transport block 203 is located at the press-fitting working position and the guide column 304 and the bearing 1 are aligned, the fifth driving mechanism 508 drives the pushing block 504 to move forward and sends the bottom spring snap ring 2 to the upper position of the guide column 304. The telescopic cylinder 501 contracts to make the pushing block 504 descend, and the spring snap ring 2 is sleeved on the guide column 304. The pushing block 504 is reset, and the spring snap ring 2 is sleeved on the guide column 304 waiting for the press-fitting block 302 to be pressed down, completing the automatic loading of the spring snap ring 2.

[0052] In a specific embodiment, referring to Fig. 9The second mounting seat 506 includes two second mounting rods 5061, the bottoms of the two second mounting rods 5061 are fixedly connected to the second feeding bracket 502, and a second mounting block 5062 is fixed on the top. A second countersunk hole 5063 is opened on the top of the second mounting block 5062, and a second limiting block 5064 is fixed on the top of the second feeding rod 507. The second limiting block 5064 can be embedded in the second countersunk hole 5063. Similarly, the second limiting block 5064 is embedded in the second countersunk hole 5063, so that the second feeding rod 507 can be removed at any time to facilitate refilling.

[0053] In a specific embodiment, the first feeding rod 404 and the second feeding rod 507 are both provided with gravity blocks for providing pressure to the bearing 1 or the spring retaining ring 2 to ensure that the bearing 1 or the spring retaining ring 2 at the bottom falls into the feeding trough 402 or the U-shaped groove 505.

[0054] In a specific embodiment, an industrial camera is disposed on the base for taking photos to detect whether the spring retaining ring 2 is properly installed on the bearing 1.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spring snap ring assembly machine, Features: It comprises a bottom plate and a transport mechanism and a pressing mechanism installed on the bottom plate; the transport mechanism comprises a transport bracket, the transport bracket is fixed on the bottom plate, a long transport hole is opened on the top of the transport bracket, a transport block is slidably installed in the long transport hole, and a placement groove is opened on the transport block, and the placement groove is used to place the bearing; The press-fitting mechanism includes a press-fitting support, which is fixed on the bottom plate. A press-fitting block is slidably installed on the side of the press-fitting support. A accommodating cavity is provided at the bottom of the press-fitting block. A guide column is arranged in the accommodating cavity. The guide column is a truncated cone structure which is small at the top and large at the bottom. A latch is fixed at the bottom of the guide column. A limiting ring groove is provided on the upper outer side of the guide column. A limiting rod is slidably penetrated in the side arm of the accommodating cavity. The end of the limiting rod close to the guide column is a U-shaped structure. The U-shaped structure of the limiting rod can be inserted into the limiting ring groove to limit and fix the guide column in the accommodating cavity.

2. A spring snap ring assembly machine according to claim 1, Features: A first driving mechanism is provided at the bottom of the transport bracket for driving the transport block to move in the long transport hole, a second driving mechanism is provided on the press-fitting support for driving the press-fitting block to move up and down, and a third driving mechanism is provided on the outer side of the press-fitting block for driving the limit rod to move left and right.

3. A spring snap ring assembly machine according to claim 1, Features: It also includes a product loading mechanism, which includes a first loading bracket, the first loading bracket is fixed on the bottom plate, a feeding trough is provided on the top of the first loading bracket, a feeding notch is provided on the top of the transport bracket corresponding to the feeding trough, a first mounting seat is fixed on the top of the first loading bracket, a first loading rod is provided on the first mounting seat, the top of the first loading rod is detachably fixedly connected to the first mounting seat, and the bottom is suspended, the first loading rod is used to sleeve a plurality of bearings, and the bottom bearing automatically falls into the feeding trough under the action of gravity, a push rod is slidably installed in the feeding trough, and a fourth driving mechanism is provided on the first loading bracket for driving the push rod to move in the feeding trough.

4. A spring snap ring assembly machine according to claim 3, Features: The first mounting seat includes two first mounting rods, the bottoms of the two first mounting rods are fixedly connected to the first loading bracket, a first mounting block is fixed on the top, a first countersunk hole is opened on the top of the first mounting block, and a first limiting block is fixed on the top of the first loading rod, and the first limiting block can be embedded in the first countersunk hole.

5. A spring snap ring assembly machine according to claim 1, Features: It also includes a steel ring feeding mechanism, which includes a telescopic cylinder, a second feeding bracket is fixed to the top of the output shaft of the telescopic cylinder, a mounting groove is formed on the top of the second feeding bracket, a pushing block is slidably installed in the mounting groove, the front end of the pushing block is a U-shaped structure, and a U-shaped groove is formed on the top of the U-shaped structure of the pushing block, a second mounting seat is fixed to the top of the second feeding bracket, a second feeding rod is arranged on the second mounting seat, the top of the second feeding rod is detachably fixedly connected to the second mounting seat, and the bottom is suspended, the second feeding rod is used to cover a plurality of spring retaining rings, and the bottom spring retaining ring automatically falls into the U-shaped groove under the action of gravity, and a fifth driving mechanism is arranged on the second feeding bracket, which is used to drive the pushing block to move in the mounting groove.

6. A spring snap ring assembly machine according to claim 5, Features: The second mounting seat includes two second mounting rods, the bottoms of the two second mounting rods are fixedly connected to the second feeding bracket, a second mounting block is fixed on the top, a second countersunk hole is opened on the top of the second mounting block, and a second limit block is fixed on the top of the second feeding rod, and the second limit block can be embedded in the second countersunk hole.

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