Pneumatic workpiece clamping device of drilling machine

Abstract

The invention provides a drilling machine workpiece pneumatic clamping device which comprises a base and a pneumatic device arranged on the base, and the pneumatic device is arranged on one side of the base; the pneumatic device is connected with the movable jaw; the fixed jaw is arranged on the other side of the base; a workpiece is fixed between the fixed jaw and the movable jaw; wherein the distance between the movable jaw and the fixed jaw is increased or decreased through the pneumatic device, so that the problem that the position of the movable jaw needs to be frequently and manually adjusted when the conventional flat tongs are used for clamping and loosening a workpiece, so that the operation is tedious is solved.

Description

Technical Field

[0001] This application relates to the technical field of processing machinery, and particularly to a pneumatic clamping device for drill press workpieces. Background Art

[0002] In the field of machining, the radial drill press is an important device widely used for drilling operations on various metal workpieces. During the drilling process, to ensure accurate and stable positioning of the workpiece and prevent it from moving or following the drill bit out of the vise during drilling, a vise is usually required to firmly clamp the workpiece. However, with the diversification of production requirements, it has become normal to frequently replace workpieces of different sizes, which poses higher requirements for the operation convenience and durability of the vise.

[0003] Existing vises mainly consist of components such as a fixed jaw, a movable jaw, a screw nut, and a crank. Its working principle is based on the screw drive principle, that is, the operator rotates the crank, drives the screw to rotate, and the nut moves along the axial direction of the screw, thereby pushing the movable jaw closer to or away from the fixed jaw to achieve clamping and loosening of the workpiece.

[0004] However, in actual applications, especially when replacing workpieces of different sizes, it is necessary to frequently manually adjust the position of the movable jaw, resulting in cumbersome operations; and as the vise is used for a longer time, the wear of components such as the screw nut and slideway is aggravated, further affecting the performance of the vise. Summary of the Invention

[0005] This application provides a pneumatic clamping device for drill press workpieces to solve the technical problem that when the existing vise clamps and loosens workpieces, it is necessary to frequently manually adjust the position of the movable jaw, resulting in cumbersome operations.

[0006] This application provides a pneumatic clamping device for drill press workpieces, including:

[0007] A base, and provided on the base:

[0008] A pneumatic device, the pneumatic device is provided on one side of the base; the pneumatic device is connected to the movable jaw;

[0009] A fixed jaw, the fixed jaw is provided on the other side of the base; the fixed jaw and the movable jaw are used to fix the workpiece;

[0010] Wherein, the distance between the movable jaw and the fixed jaw is increased or decreased by the pneumatic device.

[0011] In some embodiments, the pneumatic device includes:

[0012] A cylinder, the cylinder is connected to a control valve; the control valve is connected to an intake pipe; a push rod is provided on one side of the cylinder close to the fixed jaw; one end of the push rod is connected to the cylinder, and the other end is connected to the movable jaw;

[0013] Wherein, by opening the control valve, the distance between the movable jaw and the fixed jaw is increased or decreased.

[0014] In some embodiments, the control valve is provided with a first gear position, a second gear position, and a third gear position;

[0015] If the control valve is in the first gear position, the distance between the movable jaw and the fixed jaw is increased;

[0016] If the control valve is in the second gear position, the distance between the movable jaw and the fixed jaw is decreased;

[0017] If the control valve is in the third gear position, the distance between the movable jaw and the fixed jaw remains unchanged.

[0018] In some embodiments, the pneumatic device further includes:

[0019] A speed regulating device, the speed regulating device is connected to the intake pipe, and the speed regulating device is configured to adjust the intake air volume of the intake pipe and control the moving speed of the movable jaw.

[0020] In some embodiments, the pneumatic device further includes:

[0021] A pressure gauge, the pressure gauge is connected to the intake pipe, and the pressure gauge is configured to display the gas pressure value in the intake pipe;

[0022] An alarm device, the alarm device is connected to the pressure gauge, and the alarm device is configured to emit a warning sound when the gas pressure value is greater than a set pressure value.

[0023] In some embodiments, the pneumatic device further includes:

[0024] A water vapor separation device, the water vapor separation device is connected to the intake pipe, and the water vapor separation device is configured to separate the moisture in the gas in the intake pipe.

[0025] In some embodiments, a dovetail groove is provided on the base between the cylinder and the fixed jaw; the movable jaw is slidably connected to the dovetail groove.

[0026] In some embodiments, a telescopic device is provided on the base between the cylinder and the fixed jaw; the length of the base between the cylinder and the fixed jaw is increased or decreased through the telescopic device.

[0027] In some embodiments, anti-slip patterns are provided on one side of the workpiece fixed by the movable jaw and the fixed jaw.

[0028] In some embodiments, the thrust of the cylinder is 1000 kg; the maximum stroke of the push rod is 300 mm.

[0029] The present application provides a pneumatic clamping device for a drill press workpiece, comprising: a base, and provided on the base: a pneumatic device, the pneumatic device is provided on one side of the base; the pneumatic device is connected to a movable jaw; a fixed jaw, the fixed jaw is provided on the other side of the base; the fixed jaw and the movable jaw are used to fix the workpiece; wherein, the distance between the movable jaw and the fixed jaw is increased or decreased by the pneumatic device to solve the problem that when the current parallel jaw is used for clamping and loosening the workpiece, it is necessary to frequently manually adjust the position of the movable jaw, resulting in cumbersome operation. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of the pneumatic clamping device for a drill press workpiece in the present application at an angle;

[0032] Figure 2 It is a schematic structural diagram of the pneumatic clamping device for a drill press workpiece in the present application at another angle.

[0033] Description of the Reference Numerals:

[0034] 1 - Base; 11 - Dovetail groove; 12 - Telescopic device; 2 - Pneumatic device; 21 - Cylinder; 22 - Control valve; 23 - Inlet pipe; 24 - Push rod; 25 - Speed control device; 26 - Pressure gauge; 27 - Alarm device; 28 - Water vapor separation device; 3 - Movable jaw; 4 - Fixed jaw. Detailed Embodiments

[0035] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0036] In some technologies, when a flat-jaw vice clamps and releases a workpiece, it is necessary to frequently manually adjust the position of the movable jaw, resulting in cumbersome operations. To solve this technical problem, the present application provides a pneumatic clamping device for a drill press workpiece. The following describes the various structural parts of the pneumatic clamping device for a drill press workpiece:

[0037] As Figure 1 shown, it is a schematic structural diagram of the pneumatic clamping device for a drill press workpiece in the present application at a certain angle.

[0038] The present application provides a pneumatic clamping device for a drill press workpiece, including:

[0039] a base 1, and the following provided on the base 1:

[0040] a pneumatic device 2, the pneumatic device 2 is provided on one side of the base 1; the pneumatic device 2 is connected to the movable jaw 3; the pneumatic device 2 uses 0.1 Mpa compressed air as the air source, and a 300 mm×120 mm cylinder 21 is used as the actuator. The parameters of the SC standard cylinder are: thrust 1000 kg, maximum stroke 300 mm. The air inlet pipe 23 is made of pu material, 10*6.5 mm, transparent, and the bearing pressure is 10-12 KG. The control valve 22 selects a two-position five-way 4H210-08 pneumatic hand-operated reversing valve. The speed regulating device 25 adopts an SL cylinder throttle valve and is connected to the pipeline by a quick connector.

[0041] a fixed jaw 4, the fixed jaw 4 is provided on the other side of the base 1; the fixed jaw 4 and the movable jaw 3 are used to fix the workpiece; wherein, the distance between the movable jaw 3 and the fixed jaw 4 is increased or decreased by the pneumatic device 2.

[0042] Exemplarily, the present application uses the pneumatic device 2 to replace the manual device. By starting the pneumatic device 2, the movable jaw 3 is driven to make a reciprocating motion on the base 1, so that the distance between the movable jaw 3 and the fixed jaw 4 is increased or decreased, and the workpiece is clamped between the movable jaw 3 and the fixed jaw 4.

[0043] The present application proposes a pneumatic clamping device for a drill press workpiece, which improves the manual clamping method. In this device, the pneumatic device 2 is used as the core power component, completely replacing the manual device, thereby realizing automated and efficient clamping operations. The pneumatic device 2 serves as the power source of the entire clamping device. By receiving compressed air (or other suitable air sources) from the air compressor room, it provides the driving force required for the movement of the movable jaw 3. When the pneumatic device 2 is started, the compressed air is precisely guided into the cylinder through the air inlet pipeline, and then the piston rod of the cylinder is pushed to perform a linear reciprocating motion.

[0044] Specifically, the movable jaw 3 is connected to the piston rod of the cylinder through a connecting mechanism. When the piston rod of the cylinder extends, the movable jaw 3 moves away from the fixed jaw 4, resulting in an increase in the distance between the two; conversely, when the piston rod of the cylinder retracts, the movable jaw 3 moves towards the fixed jaw 4, and the distance between the two decreases. By the above method, the distance between the movable jaw 3 and the fixed jaw 4 can be accurately controlled, so as to realize the flexible clamping of workpieces of different sizes. When it is necessary to clamp the workpiece, just start the pneumatic device 2, and the movable jaw 3 will automatically move closer to the fixed jaw 4 until the workpiece is firmly clamped in the middle; when it is necessary to release the workpiece, start the pneumatic device 2 again (or switch its working state), and the movable jaw 3 will automatically move away from the fixed jaw 4 to release the workpiece. The entire clamping and releasing process does not require manual intervention, which not only greatly saves the physical strength of the operator, but also significantly improves the efficiency and accuracy of the drilling operation. In addition, since a pneumatic device is used as the power source, this clamping device also has the advantages of simple structure, convenient maintenance, long service life, etc., bringing a more convenient, efficient and reliable clamping solution for the drilling machine operation.

[0045] As Figure 2 shown, it is a schematic structural diagram of the pneumatic clamping device for the drilling machine workpiece in another angle in this application.

[0046] In this embodiment, the pneumatic device 2 includes:

[0047] A cylinder 21, the cylinder 21 is connected to a control valve 22; the control valve 22 is connected to an air inlet pipe 23; a push rod 24 is arranged on one side of the cylinder 21 close to the fixed jaw 4; one end of the push rod 24 is connected to the cylinder 21, and the other end is connected to the movable jaw 3; wherein, by opening the control valve 22, the distance between the movable jaw 3 and the fixed jaw 4 is increased or decreased.

[0048] Exemplarily, the control method of the control valve 22 is as follows: The control valve 22, as a control element, is used to switch the air inlet direction of the cylinder, so as to realize the telescopic movement (i.e., back and forth movement) of the cylinder. In this embodiment, the control valve 22 is a two-position five-way pneumatic hand-operated reversing valve, and the air inlet direction of the cylinder can be conveniently switched by operating the handle.

[0049] Exemplarily, the reciprocating movement principle of the cylinder 21: When the control valve 22 is switched to a certain position, compressed air enters a chamber of the cylinder from the air inlet pipe, pushing the piston to move towards another chamber, so as to realize the extension of the cylinder (or the clamping action). When the control valve 22 is switched to another position, the direction of the compressed air changes, enters another chamber of the cylinder 21, and pushes the piston to move in the opposite direction, so as to realize the retraction of the cylinder (or the releasing action).

[0050] In this embodiment, the control valve 22 is provided with a first gear position, a second gear position, and a third gear position. If the control valve 22 is in the first gear position, the distance between the movable jaw 3 and the fixed jaw 4 increases. If the control valve 22 is in the second gear position, the distance between the movable jaw 3 and the fixed jaw 4 decreases. If the control valve 22 is in the third gear position, the distance between the movable jaw 3 and the fixed jaw 4 remains unchanged.

[0051] Exemplarily, in the pneumatic clamping device for drill press workpieces of the present application, the control valve 22, as a key component for controlling the movement of the movable jaw 3, is designed with three different gear positions: the first gear position, the second gear position, and the third gear position. These three gear positions respectively correspond to different change states of the distance between the movable jaw 3 and the fixed jaw 4. Among them, the first gear position is used to increase the distance between the movable jaw 3 and the fixed jaw 4. When the control valve 22 is switched to the first gear position, the flow direction of the compressed air in the cylinder 21 changes, pushing the piston rod of the cylinder outwards. This action is transmitted to the movable jaw 3 through the connecting mechanism, causing it to move along the base 1 away from the fixed jaw 4. As the movable jaw 3 moves, the distance between it and the fixed jaw 4 gradually increases, providing sufficient space for placing or removing the workpiece.

[0052] Among them, the second gear position is used to decrease the distance between the movable jaw 3 and the fixed jaw 4. When the control valve 22 is switched to the second gear position, the flow direction of the compressed air in the cylinder changes again, pushing the piston rod of the cylinder 21 to retract inwards. This action is also transmitted to the movable jaw 3 through the connecting mechanism, causing it to move towards the fixed jaw 4. As the movable jaw 3 moves, the distance between it and the fixed jaw 4 gradually decreases until the workpiece is firmly clamped in the middle.

[0053] Among them, the third gear position is used to keep the distance between the movable jaw 3 and the fixed jaw 4 unchanged. When the control valve 22 is switched to the third gear position, the flow of the compressed air in the cylinder 21 is blocked or maintained in a balanced state, so that the piston rod of the cylinder 21 neither extends nor retracts. Therefore, the distance between the movable jaw 3 and the fixed jaw 4 remains unchanged, maintaining the current clamping state or release state.

[0054] In this embodiment, the pneumatic device 2 further includes:

[0055] A speed regulating device 25, the speed regulating device 25 is connected to the air inlet pipe 23, and the speed regulating device 25 is configured to adjust the air intake of the air inlet pipe 23 to control the moving speed of the movable jaw 3.

[0056] In the pneumatic clamping device for drill press workpieces provided by this application, in order to more precisely control the moving speed of the movable jaw 3, a speed regulating device 25 is added. The speed regulating device 25 is connected to the air inlet pipe 23, and the moving speed of the movable jaw 3 is effectively controlled by adjusting the air intake of the air inlet pipe 23. The working principle of the speed regulating device 25 is as follows: The speed regulating device 25 usually adopts a throttle valve or a similar structure, and an adjustable channel or valve is arranged inside it. By adjusting the opening degree of these channels or valves, the flow rate of the compressed air in the air inlet pipe 23 can be changed. When the air intake increases, the pressure in the cylinder rises, and the speed of pushing the piston rod speeds up, thereby accelerating the moving speed of the movable jaw 3; conversely, when the air intake decreases, the pressure in the cylinder drops, and the speed of pushing the piston rod slows down, thereby slowing down the moving speed of the movable jaw 3.

[0057] Specifically, during the use of the pneumatic clamping device for drill press workpieces, it is necessary to clamp a workpiece with a relatively large diameter and hard material. At this time, the operator can rotate the manual knob of the speed regulating device 25 clockwise to reduce the air intake, thereby slowing down the moving speed of the movable jaw 3. As the movable jaw 3 gradually approaches the fixed jaw 4, the operator can gradually observe that the workpiece is firmly clamped in the middle without any sliding or deformation, ensuring the smoothness and accuracy of the clamping process between the movable jaw 3 and the fixed jaw 4.

[0058] In this embodiment, the pneumatic device 2 further includes:

[0059] A pressure gauge 26, the pressure gauge 26 is connected to the air inlet pipe 23, and the pressure gauge 26 is configured to display the gas pressure value in the air inlet pipe 23; an alarm device 27, the alarm device 27 is connected to the pressure gauge 26, and the alarm device 27 is configured to emit a warning sound when the gas pressure value is greater than the set pressure value.

[0060] Exemplarily, in the pneumatic clamping device for drill press workpieces of this application, in order to improve the safety and reliability of the device, a pressure gauge 26 and an alarm device 27 are added, so that the operator can monitor the gas pressure value in the air inlet pipe 23 in real time and obtain a warning in time when the pressure is abnormal, thereby effectively preventing equipment damage or safety accidents caused by excessive pressure. The pressure gauge 26 is directly installed on the air inlet pipe 23 and is connected to the gas inside the air inlet pipe through a pipeline connection. Its main function is to display the gas pressure value in the air inlet pipe 23 in real time, providing intuitive pressure data reference for the operator. In actual applications, the operator can judge whether the pneumatic device 2 is working properly by observing the reading of the pressure gauge 26. If the pressure value is within the set range, it means that the pneumatic device is operating normally; if the pressure value deviates from the set range, it is necessary to check whether there is air leakage, blockage or other faults in the air inlet pipe 23.

[0061] Exemplarily, the alarm device 27 is connected to the pressure gauge 26 and receives the pressure signal from the pressure gauge. Its main function is to automatically emit a warning sound when the gas pressure value is greater than the set pressure value, reminding the operator to pay attention to the equipment status and take corresponding measures. The alarm device 27 usually adopts an audible and visual alarm method, which can quickly attract the operator's attention and ensure the timely transmission of warning information.

[0062] In this embodiment, the pneumatic device 2 further includes:

[0063] A water vapor separation device 28, the water vapor separation device 28 is connected to the intake pipe 23, and the water vapor separation device 28 is configured to separate the moisture in the gas in the intake pipe 23.

[0064] Exemplarily, in a pneumatic clamping device for a drilling machine workpiece, compressed air as a power source needs to be kept clean and dry to avoid the following hazards to the equipment caused by moisture. Specifically, the contact between moisture and metal accelerates oxidation, resulting in corrosion of key components such as cylinders, piston rods, and connectors, shortening the equipment life. After moisture invades the intake pipe 23, it is easy to cause the intake pipe 23 to expand, deform, or harden and crack, resulting in airtightness failure, air leakage, and pressure fluctuations. If precision components such as the control valve 22 and the speed regulating device 25 come into contact with moisture, it may block the valve core and jam the moving parts, resulting in gear shifting failure or speed regulation failure. At low temperatures, the freezing of moisture will block the intake pipe 23, resulting in equipment shutdown or even pipeline bursting. Through the setting of the water vapor separation device 28, liquid water, oil mist, and particulate matter in the compressed air are removed through water vapor separation technology, ensuring the stable operation of the pneumatic device 2.

[0065] In this embodiment, a dovetail groove 11 is provided on the base 1 between the cylinder 21 and the fixed jaw 4; the movable jaw 3 is slidably connected to the dovetail groove 11. In order to ensure that the movable jaw 3 can perform normal reciprocating operation, in this application, a dovetail groove 11 is provided on the base 1 between the cylinder 21 and the fixed jaw 4, so that the movable jaw 3 can normally reciprocate within the dovetail groove 11.

[0066] In this embodiment, a telescopic device 12 is provided on the base 1 between the cylinder 21 and the fixed jaw 4; through the telescopic device 12, the length of the base 1 between the cylinder 21 and the fixed jaw 4 is increased or decreased. It can be understood that through the telescopic device 12, the length of the base 1 between the cylinder 21 and the fixed jaw 4 can be adjusted, thereby adjusting the distance between the movable jaw 3 and the fixed jaw 4, so as to meet the requirements of workpieces of any size.

[0067] In this embodiment, anti-slip patterns are provided on one side of the workpiece fixed by the movable jaw 3 and the fixed jaw 4. Through the provision of the anti-slip patterns, the frictional force between the movable jaw 3 and the fixed jaw 4 and the workpiece is increased, thereby preventing the workpiece clamped between the movable jaw 3 and the fixed jaw 4 from detaching from the pneumatic clamping device for the workpiece of the drilling machine.

[0068] Exemplarily, the thrust of the air cylinder 21 is 1000 kg; the maximum stroke of the push rod 24 is 300 mm.

[0069] Exemplarily, after the processing of the pneumatic clamping device for the workpiece of the drilling machine is completed, the pressure of the air source (input through a pipeline by the mine pressure blower) is tested, and the pressure is 0.1 Mpa, meeting the design requirements. By using it, the clamping force on the workpiece meets the usage and safety requirements. The pressure gauge 26 and the water-vapor separation device 28 are added, and a protective sleeve for the piston rod of the air cylinder is added, and the overall meets the design and usage requirements.

[0070] A pneumatic clamping device for the workpiece of a drilling machine provided by this application modifies the manual clamping of the parallel jaw to the operation of the control valve 22 for clamping, greatly saving physical strength. The operator can operate upright, reducing the probability of suffering from lumbar muscle strain. This device utilizes the existing air source in the air compressor room of the unit, greatly saving the manufacturing cost and the usage cost, and greatly improving the production efficiency.

[0071] The above specific implementation manners have further elaborated on the purpose, technical solutions, and beneficial effects of the embodiments of this application. It should be understood that the above is only the specific implementation manners of the embodiments of this application and is not used to limit the protection scope of the embodiments of this application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of this application should be included in the protection scope of the embodiments of this application.

Claims

1. A pneumatic clamping device for a drill press workpiece, characterized in that Including: A base (1), and provided on the base (1): A pneumatic device (2), the pneumatic device (2) is provided on one side of the base (1); the pneumatic device (2) is connected to a movable jaw (3); A fixed jaw (4), the fixed jaw (4) is provided on the other side of the base (1); the fixed jaw (4) and the movable jaw (3) are used to fix a workpiece; Wherein, the distance between the movable jaw (3) and the fixed jaw (4) is increased or decreased by the pneumatic device (2).

2. The pneumatic clamping device for a drill press workpiece according to claim 1, wherein, The pneumatic device (2) includes: A cylinder (21), the cylinder (21) is connected to a control valve (22); the control valve (22) is connected to an air inlet pipe (23); a push rod (24) is provided on one side of the cylinder (21) close to the fixed jaw (4); one end of the push rod (24) is connected to the cylinder (21), and the other end is connected to the movable jaw (3); Wherein, by opening the control valve (22), the distance between the movable jaw (3) and the fixed jaw (4) is increased or decreased.

3. The pneumatic clamping device for the workpiece of a drilling machine according to claim 2, characterized in that, The control valve (22) is provided with a first gear position, a second gear position, and a third gear position; If the control valve (22) is in the first gear position, the distance between the movable jaw (3) and the fixed jaw (4) is increased; If the control valve (22) is in the second gear position, the distance between the movable jaw (3) and the fixed jaw (4) is decreased; If the control valve (22) is in the third gear position, the distance between the movable jaw (3) and the fixed jaw (4) remains unchanged.

4. The pneumatic clamping device for a drilling machine workpiece according to claim 2, characterized in that, The pneumatic device (2) further includes: A speed regulating device (25), the speed regulating device (25) is connected to the air inlet pipe (23), and the speed regulating device (25) is configured to adjust the air intake of the air inlet pipe (23) and control the moving speed of the movable jaw (3).

5. The pneumatic clamping device for the workpiece of a drilling machine according to claim 2, characterized in that, The pneumatic device (2) further includes: A pressure gauge (26), the pressure gauge (26) is connected to the air inlet pipe (23), and the pressure gauge (26) is configured to display the gas pressure value in the air inlet pipe (23); An alarm device (27), the alarm device (27) is connected to the pressure gauge (26), and the alarm device (27) is configured to emit a warning sound when the gas pressure value is greater than a set pressure value.

6. The pneumatic clamping device for the workpiece of a drilling machine according to claim 2, characterized in that, The pneumatic device (2) further includes: A water vapor separation device (28), the water vapor separation device (28) is connected to the air inlet pipe (23), and the water vapor separation device (28) is configured to separate the moisture in the gas in the air inlet pipe (23).

7. The pneumatic clamping device for a drilling machine workpiece according to claim 2, characterized in that, A dovetail groove (11) is provided on the base (1) between the cylinder (21) and the fixed jaw (4); the movable jaw (3) is slidably connected to the dovetail groove (11).

8. The pneumatic clamping device for a drill press workpiece according to claim 2, characterized in that, An expansion device (12) is provided on the base (1) between the cylinder (21) and the fixed jaw (4); the length of the base (1) between the cylinder (21) and the fixed jaw (4) is increased or decreased by the expansion device (12).

9. The pneumatic clamping device for the workpiece of a drilling machine according to claim 1, wherein, The side of the movable jaw (3) and the fixed jaw (4) for clamping the workpiece is provided with anti-slip lines.

10. The pneumatic clamping device for the workpiece of a drilling machine according to claim 2, characterized in that, The thrust of the cylinder (21) is 1000 kg; the maximum stroke of the push rod (24) is 300 mm.

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