Cooling device for machine tool cutting

Abstract

The utility model relates to the technical field of machine tool equipment, in particular to a cooling device for machine tool cutting, which comprises a fixed rod, a moving mechanism and an injection mechanism, the moving mechanism is arranged on the fixing rod and can move in the length direction of the cutter along the fixing rod in the using state, the spraying mechanism comprises a supporting ring, a support and one or more spraying guns, the supporting ring is fixed to the moving mechanism and can synchronously move along with movement of the moving mechanism, and the spraying guns are installed on the supporting ring through the support. A gas-liquid mixing unit is arranged in the spray gun and used for spraying a gas-liquid mixture to the tool. The spraying device has the advantages that the moving mechanism is arranged to control the spraying mechanism to be always aligned with the tool, the gas-liquid mixing unit is arranged in the spraying gun and used for spraying a gas-liquid mixture, the gas-liquid mixture can be fully sprayed to the surface of the tool, and the cooling effect is better.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tool equipment, in particular to a cooling device for machine tool cutting. Background Art

[0002] In the field of mechanical processing, especially in the process of machine tool cutting, the cooling of the tool is one of the key factors to ensure the efficiency and quality of cutting. However, in the existing machine tool cutting technology, the problem of insufficient tool cooling is common. When the existing cooling device is in use, the range of spraying and cooling is relatively limited, which can easily cause uneven and incomplete cooling of the tool. This situation is usually caused by insufficient spraying of the coolant or the failure of the coolant to accurately aim at the tool head. When the coolant cannot effectively cover the contact area between the tool and the workpiece, the tool temperature will rise sharply, which not only aggravates the tool wear and shortens the service life of the tool, but may also generate sparks, increasing safety hazards at the work site. Utility Model Content

[0003] The utility model aims to provide a cooling device for machine tool cutting, which solves the problem that the cooling liquid of the existing cooling device is not sufficiently sprayed, and makes the cutting cooling of the tool more sufficient and effective.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a cooling device for machine tool cutting, which includes a fixed rod, a moving mechanism and a spraying mechanism, the fixed rod is used to be fixed on the machine tool spindle box for installing the tool, the moving mechanism is arranged on the fixed rod and can move along the fixed rod in the length direction of the tool when in use, the spraying mechanism includes a support ring, a bracket and one or more spray guns, the support ring is fixed on the moving mechanism and can move synchronously with the movement of the moving mechanism, the spray gun is installed on the support ring by the bracket, and a gas-liquid mixing unit is arranged in the spray gun for spraying a gas-liquid mixture to the tool. In the utility model, the device controls the spraying mechanism to always align with the cutting part of the tool by arranging a moving mechanism, multiple spray guns are aimed at the tool from multiple directions, and a gas-liquid mixing unit is arranged in the spray gun for spraying a gas-liquid mixture, the gas-liquid mixture is in a mist form, and is sprayed on the tool surface more evenly and with a wider coverage. In the cutting cooling method, the high-speed gas-liquid spray cooling effect is better than liquid spray cooling.

[0005] As a preferred solution of the cooling device for machine tool cutting of the utility model, the moving mechanism includes a control box and a hand wheel, the support ring is arranged on the end of the control box away from the fixed rod, the hand wheel is provided with a first screw rod penetrating the control box, the first screw rod is sleeved with a gear that can rotate in the control box, a lifting slot for the fixed rod to be inserted is vertically provided on the top of the control box, and a rack meshing with the gear is arranged on the part of the fixed rod inserted into the lifting slot. The utility model can more conveniently control the lifting and lowering of the control box on the fixed rod and thus the lifting and lowering of the support ring by controlling the hand wheel.

[0006] As a preferred solution of the cooling device for machine tool cutting of the utility model, a clamping block capable of clamping the fixed rod is arranged in the control box close to the fixed rod and away from the rack, and a clamping knob extending out of the control box is arranged on one side of the clamping block, and the clamping knob is rotated to push the clamping block to clamp the fixed rod, so as to prevent the control box from moving on the fixed rod. In the utility model, after the clamping block clamps the fixed rod, the control box will not fall after moving, which is safer and easier to operate.

[0007] As a preferred solution of the cooling device for machine tool cutting of the utility model, the spray gun includes a spray head, a first channel and a second channel are provided on the spray head, the first channel runs through both ends of the spray gun, the end of the first channel away from the tool in the use state is connected to the external air pipe, one end of the second channel is connected to the first channel away from the external air pipe, and the other end of the second channel extends out of the spray gun and is connected to the coolant pipe in the use state. The utility model can mix the coolant and the gas at the intersection of the first channel and the second channel, and then spray them from the spray head, and the cooling effect of the gas-liquid mixture spraying is better.

[0008] As a preferred solution of a cooling device for machine tool cutting of the utility model, the gas-liquid mixing unit includes a third channel and a bolt piston and a third channel opened on the spray gun and vertically connected to the first channel. The bolt piston is inserted into one end of the third channel from outside the spray gun, and the other end of the third channel is connected to the second channel and the coolant pipe. The bolt piston is arranged in the utility model to not only block the third channel but also facilitate maintenance. The third channel is connected to the first channel and the second channel, and the cooling effect of the spray gun can be manually intervened, which is more convenient.

[0009] As a preferred solution of the cooling device for machine tool cutting of the utility model, the gas-liquid mixing unit further comprises a rotatable intercepting column, which is vertically inserted from the top surface of the spray gun and passes through the third channel, and the portion of the intercepting column in the third channel is provided with a first through hole whose aperture does not exceed that of the third channel. In the utility model, the intercepting column can intercept the third channel, so that the coolant cannot flow in the third channel, and the coolant can flow into the third channel by rotating the intercepting column so that the first through hole is aligned with the third channel, and the operation is simple.

[0010] As a preferred solution of a cooling device for machine tool cutting of the utility model, a slider for blocking the connection between the first channel and the third channel is provided in the third channel and between the shutoff column and the bolt piston, a second through hole is provided on the slider, and the second through hole can realize the connection of the first channel on both sides of the third channel, a fourth channel connecting the second channel and the third channel is provided between the slider and the shutoff column, and a check valve is provided at the place where the fourth channel connects to the third channel. In the utility model, the liquid retained between the shutoff column and the slider can flow into the second channel through the fourth channel through the check valve.

[0011] As a preferred solution of the cooling device for milling machine cutting of the utility model, a first spring is arranged between the slider and the bolt piston, and the first spring makes the slider be at the connection point between the first channel and the third channel in a natural state, and when the shut-off column is rotated to make the first through hole and the third channel penetrate, the coolant flows into and pushes the slider, so that the second through hole is aligned with the connection point between the first channel and the third channel, and the air then passes through the first channel and mixes with the coolant in the second channel to achieve gas-liquid mixing.

[0012] As a preferred solution of the cooling device for machine tool cutting of the utility model, a symmetrical receiving groove is provided at the bottom end of the intercepting column passing through the third channel, a second spring and a steel ball connected to the second spring are arranged in the receiving groove, and a groove for clamping the steel ball is uniformly provided at the bottom end of the hole of the spray gun for accommodating the intercepting column. The second spring pushes the steel ball into the groove in a natural state and clamps it, so as to prevent the intercepting column from rotating. The utility model rotates the intercepting column, and the ball at the bottom end applies pressure in the direction of the spring, causing the spring to be compressed, and the ball enters the receiving groove. After rotating a certain angle, the ball falls into the groove and is fixed, which is very convenient.

[0013] As a preferred solution of the cooling device for machine tool cutting of the utility model, a mounting hole is provided on the spray gun, a second screw is provided in the mounting hole to fix the spray gun to the bracket, and a butterfly nut is provided at one end of the second screw extending out of the mounting hole for adjusting the second screw. The utility model can manually adjust the angle of the spray gun in time to achieve focusing by rotating the butterfly nut to loosen or tighten it, so that the spray head is always aimed at the cutting part of the tool, which is simple to operate and can ensure the cooling effect.

[0014] The utility model provides a cooling device for machine tool cutting with beneficial effects: the utility model realizes gas-liquid mixed jet cooling by adopting a novel gas-liquid mixing unit structural design. Compared with the traditional cooling method, the operation is more convenient. Different cooling methods can be switched by rotating the interception column. The spray gun can be easily aimed at the tool through the hand wheel, which can cool the tool more effectively, improve the cooling efficiency, and extend the service life of the tool. Through the combination of the butterfly nut and the second screw, the angle of the spray gun can be manually adjusted to achieve precise focusing of the gas-liquid mixture, ensuring that the gas and liquid are directly sprayed into the tool processing area. The chips can also be effectively removed to avoid interference with the processing process caused by chip accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0016] Figure 1 It is an overall schematic diagram of the device in the utility model.

[0017] Figure 2 It is a cross-sectional view of the moving mechanism of the device in the utility model.

[0018] Figure 3 It is a cross-sectional view of the clamping block of the device in the utility model.

[0019] Figure 4 It is a structural schematic diagram of the gas-liquid mixing unit of the device in the utility model.

[0020] Figure 5 It is a schematic diagram of the structure of the intercepting column of the device in the utility model.

[0021] Figure 6 It is a cross-sectional view of the intercepting column of the device in the utility model.

[0022] Figure 7 This is a spray gun connection assembly diagram of the device in the utility model.

[0023] Among them: 13, L-shaped fixing rod; 2, moving mechanism; 21, operating box; 211, lifting slot; 22, hand wheel; 23, first screw rod; 24, gear; 25, rack; 26, clamping block; 27, clamping knob; 3, injection mechanism; 31, support ring; 32, bracket; 33, spray gun; 331, first channel; 332, second channel; 333, mounting hole; 334, second screw rod; 335, butterfly nut; 35, gas-liquid mixing unit; 351, intercepting column; 352, third channel; 353, bolt piston; 354, slider; 355, first spring; 356, first through hole; 357, second through hole; 358, fourth channel; 36, accommodating groove; 361, second spring; 362, steel ball; 363, groove. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Reference Figure 1-7 This embodiment provides a cooling device for machine tool cutting. The device adopts a new gas-liquid mixed injection mechanism and a new focusing method, so that the tool is fully cooled during the cutting process and the chips generated during the cutting process can be removed. The operation is simple, the cooling efficiency is improved, and the service life of the tool is extended. The utility model is explained by taking the example that the tool is in a vertical state and the top end is installed on the machine tool spindle in the use state.

[0028] A cooling device for machine tool cutting includes a moving mechanism 2 and a spraying mechanism 3. An L-shaped fixed rod 13 for lifting the moving mechanism 2 is arranged on one side of the machine tool spindle box. The spraying mechanism 3 includes a support ring 31, a bracket 32 ​​and a spray gun 33. The support ring 31 is arranged at the bottom of the moving mechanism 2. The support ring 31 is directly opposite to the bottom of the machine tool spindle box. The tool is at the center of the support ring 31, which makes it more convenient for the spray gun 33 to aim at the tool. At least one bracket 32 ​​is arranged circumferentially at the bottom of the support ring 31. A spray gun 33 is arranged at one end of each bracket 32 ​​near the tool. A gas-liquid mixing unit 35 is arranged in the spray gun 33 for spraying a gas-liquid mixture. The gas-liquid mixture can be fully sprayed onto the tool surface. Multiple spray guns 33 can cover a larger area of ​​the tool surface, and the cooling effect is good.

[0029] Specifically, the moving mechanism 2 includes an operating box 21 and a handwheel 22. A support ring 31 is provided at the bottom of the operating box 21. A first screw 23 is provided on one side of the handwheel 22 and passes through the operating box 21. Both ends of the first screw 23 are fixed with nuts. The rotation of the handwheel 22 drives the first screw 23 to rotate. A gear 24 that can rotate in the operating box 21 is provided on the first screw 23. A lifting groove 211 for inserting the fixed rod 13 is vertically provided on the top of the operating box 21. The part of the fixed rod 13 inserted into the lifting groove 211 is provided with a rack 25 meshing with the gear 24. The handwheel 22 is rotated, and the gear 24 drives the operating box 21 to rise and fall along the rack 25, so that the lifting spray gun 33 is consistent with the height of the tool.

[0030] Among them, a rocker for easy operation is set on one side of the hand wheel 22, and the moving mechanism 2 can adapt to the height of the tool under more work.

[0031] Furthermore, a clamping block 26 that can clamp the fixed rod 13 is provided in the operating box 21, close to the fixed rod 13 and away from the rack 25. A clamping knob 27 extending out of the operating box 21 is provided on one side of the clamping block 26. The clamping knob 27 is rotated to push the clamping block 26 to clamp the fixed rod 13, so that the operating box 21 maintains a relative position with the fixed rod 13 unchanged and will not slide down. The operation is simple and safer.

[0032] Specifically, the spray gun 33 includes a nozzle, a first channel 331 and a second channel 332. The first channel 331 is opened at the top of the spray gun 33 and passes through the nozzle. The top of the first channel 331 is connected to the air pipe. One end of the second channel 332 is connected to the first channel 331 near the nozzle. The other end of the second channel 332 extends out of the spray gun 33 and is connected to the coolant pipe. The gas can be sprayed out from the nozzle through the first channel 331, and the coolant can be sprayed out from the nozzle through the second channel 332.

[0033] Specifically, the gas-liquid mixing unit 35 includes a third channel 352 and a bolt piston 353. The third channel 352 is vertically penetrated and connected to the first channel 331 at the top of the side wall of the spray gun 33. One end of the third channel 352 is inserted into the bolt piston 353 from the outside of the spray gun 33. The bolt piston 353 can not only block the third channel 352, but also facilitate disassembly and maintenance. The other end of the third channel 352 is connected to the second channel 332 and the coolant pipe.

[0034] The third channel 352 mainly serves to adjust and select the cooling method.

[0035] Furthermore, the gas-liquid mixing unit 35 also includes a rotatable shut-off column 351, which is vertically inserted from the top surface of the spray gun 33 and passes through the third channel 352. The part of the shut-off column 351 in the third channel 352 is provided with a first through hole 356 with an aperture not exceeding the third channel 352. When coolant is used for cooling, the first through hole 356 and the third channel 352 are vertically intersected and not connected. If a gas-liquid mixture is used for cooling, the shut-off column 351 is rotated to align the first through hole 356 with the third channel 352.

[0036] Preferably, an operating knob is provided at the top of the shut-off column 351 for more convenient operation.

[0037] Furthermore, a slider 354 is provided in the third channel 352 and between the shutoff column 351 and the bolt piston 353 to block the communication between the first channel 331 and the third channel 352. The slider 354 is provided with a second through hole 357. The second through hole 357 can realize the communication between the first channel 331 on both sides of the third channel 352. If gas is to be introduced into the first channel 331, the second through hole 357 is aligned with the first channel 331. Otherwise, the slider 354 is used to block the first channel 331. A second channel for communication is opened between the slider 354 and the shutoff column 351. 332 and the fourth channel 358 of the third channel 352, a check valve is set at the place where the fourth channel 358 is connected to the third channel 352, and the shut-off column 351 cannot completely block the passage of the coolant. There is a situation where a small amount of coolant flows through the shut-off column 351. A small amount of coolant can flow from the fourth channel 358 into the second channel 332, and when there is no need to use a gas-liquid mixture for cooling, the shut-off column 351 is closed. At this time, there is still coolant between the shut-off column 351 and the slider 354, and the coolant can flow from the fourth channel 358 into the second channel 332.

[0038] Furthermore, a first spring 355 is arranged between the slider 354 and the bolt piston 353. The first spring 355 pushes the slider 354 to be at the connection point between the first channel 331 and the third channel 352 in a natural state, blocking the first channel 331. When the intercepting column 351 is rotated to make the first through hole 356 and the third channel 352 pass through, the coolant flows into and pushes the slider 354, so that the second through hole 357 is aligned with the connection point between the first channel 331 and the third channel 352. The air then passes through the first channel 331 and mixes with the coolant in the second channel 332 to achieve gas-liquid mixing.

[0039] Furthermore, a symmetrical receiving groove 36 is provided at the part of the bottom end of the intercepting column 351 that passes through the third channel 352, and a second spring 361 and a steel ball 362 connected to the second spring 361 are arranged in the receiving groove 36. A groove 363 for clamping the steel ball 362 is evenly provided in the circumference of the bottom end of the hole in the spray gun 33 that accommodates the intercepting column 351. The second spring 361 pushes the steel ball 362 into the groove 363 in a natural state to get stuck, so that the intercepting column 351 does not rotate. While ensuring safety, the operator can manually adjust the intercepting column 351 to select a cooling method. By rotating the intercepting column 351, the ball 362 at the bottom will apply pressure in the direction of the spring, causing the second spring 361 to be compressed, and the ball 362 enters the receiving groove 36. After rotating a certain angle, the ball 362 falls into the groove 363 and is fixed.

[0040] The receiving groove 36 , the second spring 361 and the steel ball 362 are arranged as a group of two, and four grooves 363 are evenly arranged around the circumference. The grooves 363 match the steel ball 362 . In this state, the intercepting column 351 only needs to be rotated ninety degrees each time.

[0041] Furthermore, a mounting hole 333 is provided on the side wall of the spray gun 33 away from the first channel 331, the second channel 332 and the third channel 352, and a second screw 334 for fixing the spray gun 33 to the bracket 32 ​​is provided in the mounting hole 333, and a butterfly nut 335 for adjusting the second screw 334 is provided at one end of the second screw 334 extending out of the mounting hole 333. By rotating the tightness of the butterfly nut 335, the angle of the spray gun 33 can be manually adjusted in time to achieve focusing, so that the nozzle is always aimed at the tool, ensuring that the gas-liquid mixture can always be sprayed onto the surface of the tool.

[0042] In the utility model, before processing, the device adjusts the angles of the three spray guns 33 to focus on the tool, rotates the hand wheel 22 to adjust the height of the focus point, makes the spray gun 33 consistent with the tool height, and then rotates the clamping knob 27 to fix the height of the control box 21. At this time, the gas-liquid mixing unit 35 is in a closed state, only the coolant flows out, and can be used when rapid cooling is not required; the intercepting column 351 is rotated to make the first through hole 356 and the third channel 352 connected, and the coolant flows in, pushing the slider 354 to slide, so that the second through hole 357 and the first channel 331 are connected. At this time, the gas in the air pipe enters the first channel 331 and mixes with the liquid flowing into the second channel 332 of the hole and sprays out, which greatly increases the cooling effect, and can also effectively remove chips, reduce tool wear caused by high temperature, and extend the service life of the tool.

[0043] The parts not specifically described in the above description are all prior art, or can be implemented by prior art. Moreover, the specific implementation cases described in this utility model are only preferred implementation cases of this utility model, and are not used to limit the implementation scope of this utility model. That is, all equivalent changes and modifications made according to the content of the patent scope of this utility model should be regarded as the technical scope of this utility model.

Claims

1. A cooling device for machine tool cutting, characterized in that: The invention comprises a fixed rod (13), a moving mechanism (2) and a spraying mechanism (3); the fixed rod (13) is used to be fixed on a machine tool spindle box for mounting a tool; the moving mechanism (2) is arranged on the fixed rod (13) and can move along the fixed rod (13) in the length direction of the tool when in use; the spraying mechanism (3) comprises a support ring (31), a bracket (32) and one or more spray guns (33); the support ring (31) is fixed on the moving mechanism (2) and can move synchronously with the movement of the moving mechanism (2); the spray gun (33) is mounted on the support ring (31) by the bracket (32); a gas-liquid mixing unit (35) is arranged in the spray gun (33) for spraying a gas-liquid mixture onto the tool.

2. The cooling device for machine tool cutting according to claim 1, characterized in that: The moving mechanism (2) comprises an operating box (21) and a hand wheel (22); a support ring (31) is arranged on one end of the operating box (21) away from the fixed rod (13); a first screw rod (23) penetrating the operating box (21) is arranged on the hand wheel (22); a gear (24) rotatable in the operating box (21) is sleeved on the first screw rod (23); a lifting groove (211) for inserting the fixed rod (13) is provided on the operating box (21); the fixed rod (13) is inserted into the lifting groove (211) and is provided with a rack (25) meshing with the gear (24).

3. The cooling device for machine tool cutting according to claim 2, characterized in that: A clamping block (26) capable of clamping the fixed rod (13) is arranged in the control box (21) at a position away from the rack (25); a clamping knob (27) extending out of the control box (21) is arranged on one side of the clamping block (26); the clamping knob (27) is rotated to push the clamping block (26) to clamp the fixed rod (13), so as to prevent the control box (21) from moving on the fixed rod (13).

4. The cooling device for machine tool cutting according to claim 1, characterized in that: The spray gun (33) comprises a spray head, on which a first channel (331) and a second channel (332) are provided, the first channel (331) runs through both ends of the spray gun (33), one end of the first channel (331) away from the tool in a use state is connected to an external air pipe, one end of the second channel (332) is connected to the first channel (331) away from the external air pipe, and the other end of the second channel (332) extends out of the spray gun (33) and is connected to a coolant pipe in a use state.

5. The cooling device for machine tool cutting according to claim 1, characterized in that: The gas-liquid mixing unit (35) comprises a bolt piston (353) and a third channel (352) opened on the spray gun (33) and vertically connected to the first channel (331); the bolt piston (353) is inserted into one end of the third channel (352) from outside the spray gun (33); and the other end of the third channel (352) is connected to the second channel (332) and the coolant pipe.

6. The cooling device for machine tool cutting according to claim 5, characterized in that: The gas-liquid mixing unit (35) further comprises a rotatable intercepting column (351), which is vertically inserted into and passes through the third channel (352), and a first through hole (356) having a hole diameter not exceeding that of the third channel (352) is provided on the portion of the intercepting column (351) inside the third channel (352).

7. The cooling device for machine tool cutting according to claim 6, characterized in that: A slider (354) is provided in the third channel (352) and between the shutoff column (351) and the bolt piston (353) for blocking the connection between the first channel (331) and the third channel (352). The slider (354) is provided with a second through hole (357). The second through hole (357) can realize the connection between the first channel (331) on both sides of the third channel (352). A fourth channel (358) is provided between the slider (354) and the shutoff column (351) for connecting the second channel (332) and the third channel (352). A check valve is provided at the place where the fourth channel (358) connects to the third channel (352).

8. The cooling device for machine tool cutting according to claim 7, characterized in that: A first spring (355) is arranged between the slider (354) and the bolt piston (353). The first spring (355) causes the slider (354) to be located at the connection point between the first channel (331) and the third channel (352) in a natural state. When the intercepting column (351) is rotated to connect the first through hole (356) and the third channel (352), the coolant flows into and pushes the slider (354), so that the second through hole (357) is aligned with the connection point between the first channel (331) and the third channel (352). The air then passes through the first channel (331) and mixes with the coolant in the second channel (332), thereby achieving gas-liquid mixing.

9. The cooling device for machine tool cutting according to claim 8, characterized in that: A symmetrical receiving groove (36) is provided at the bottom end of the intercepting column (351) passing through the third channel (352), and a second spring (361) and a steel ball (362) connected to the second spring (361) are arranged in the receiving groove (36). A groove (363) for clamping the steel ball (362) is uniformly provided in the circumferential direction at the bottom end of the hole of the spray gun (33) for accommodating the intercepting column (351). The second spring (361) pushes the steel ball (362) into the groove (363) in a natural state to clamp the steel ball (362), thereby preventing the intercepting column (351) from rotating.

10. The cooling device for machine tool cutting according to claim 5, characterized in that A mounting hole (333) is provided on the spray gun (33), a second screw rod (334) for fixing the spray gun (33) to the bracket (32) is arranged in the mounting hole (333), and a butterfly nut (335) for adjusting the second screw rod (334) is arranged at one end of the second screw rod (334) extending out of the mounting hole (333).

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