Hydraulic clamp for machine base

Abstract

The utility model provides a hydraulic clamp for a machine base, which comprises an axial positioning piece fixed on a mounting plate of a machine tool and arranged to abut against a first end of the machine base in the axial direction; the centering mechanism is fixed to a mounting plate of the machine tool, extends in the axial direction and is arranged to be capable of extending into an inner hole of the machine base so as to provide radial pressing force for supporting the machine base from the inner side of the machine base; and the end face pressing mechanism is arranged to abut against the second end of the machine base and apply axial pressing force towards the first end to the second end, and particularly, the end face pressing mechanism is rigidly connected to the centering mechanism. A tailstock pressing cylinder is removed, and an end face pressing mechanism and a centering mechanism are further rigidly connected with a machine tool, so that the structural stability and the rigid strength are improved, and the machining quality is guaranteed; and the structure is simpler, so that the cost is saved, the operation is simplified, and fault points and fault rates are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of automated processing, and in particular relates to a clamp used for a machine base in an automated production line, and specifically relates to a hydraulic clamp used for a machine base in a vertical machining center. Background Art

[0002] As an important part of the motor, the motor base has high requirements for its local flatness and coaxiality. In the automated production line of the motor base, a vertical machining center with hydraulic clamps is usually used to process the base feet, anchor holes, peripheral holes, etc. The existing clamps usually position one end of the base with the positioning ring of the fourth axis and tighten the other end of the base with a tailstock with a hydraulic cylinder to achieve clamping of the base.

[0003] However, this existing clamping method has many shortcomings. For example, since the tailstock uses an external hydraulic cylinder to provide axial clamping force, when the axial clamping force is large, the fourth axis and its positioning ring will be pressed and tilted, causing the machine base being processed to tilt along with the tilt of the positioning ring, making the quality of the product after processing substandard. If the axial clamping force is not large enough, the machine base may fall. For example, when the milling cutter feeds from the upper side of the base, the machine base will fall due to the initial pressure during feeding, thus affecting the product quality. For this reason, the technicians controlled and adjusted the clamping force of the tailstock to reduce the tilt of the fourth axis. At the same time, in order to achieve stable support for the machine base, additional side auxiliary supports are required, resulting in a complex final structure, high cost, complex operation and low processing efficiency. Furthermore, due to the complex structure, there are many fault points. In the automation line, once a fault occurs, there are naturally many points that need to be checked.

[0004] In terms of automation coordination, it often happens that the tailstock's pressure claw fails to retract into place. For example, the pressure claw may rotate after being extended, resulting in it not being able to accurately fit into the receiving slot when retracting, and thus cannot be retracted into place. In this case, due to limited operating space, the pressure claw that has not been retracted into place may interfere with the processing tool or collide with the robot of the handling machine base.

[0005] In addition, the existing clamp itself has incomplete cleaning pipelines, and a lot of iron filings often remain on the surface and inner hole of the machine base, which can easily contaminate the robot's grippers and affect the product grasping accuracy. In particular, the right-side positioning ring is currently cleaned by blowing, and the cleaning force is relatively small, and iron filings often remain. These residual iron filings will affect the fit between the machine base surface and the positioning ring, thereby affecting the alignment and stability of the base during clamping.

[0006] In addition, the machine base usually has different models and therefore different lengths. When clamping machine bases of different sizes, it is usually necessary to move the tailstock, which is time-consuming and labor-intensive and has limited moving positions. If the machine base is small, the pressure rod of the clamping cylinder of the tailstock needs to be extended to a longer length. The longer the extension length, the more unstable the pressure rod, which will cause the machine base to be unstable due to unstable clamping and unstable quality.

[0007] In order to avoid the above-mentioned problems of the fixtures of the existing vertical machining centers, some automated lines use horizontal machining centers equipped with hydraulic fixtures to achieve partial processing such as the base foot, but the equipment is expensive.

[0008] Therefore, it is necessary to provide an improved fixture that can solve the above-mentioned shortcomings of the machine base fixture of the existing vertical machining center in a more effective way. Utility Model Content

[0009] The present disclosure is intended to provide a hydraulic clamp for a machine bed, which at least partially eliminates the deficiencies of the existing machine bed clamps in a vertical machining center.

[0010] The first object of the present disclosure is to provide a hydraulic clamp for a machine base, which can stably support the machine base and ensure the processing quality of the machine base.

[0011] Another object of the present disclosure is to provide a hydraulic clamp for a machine base having a simpler structure to save costs, simplify operations, and reduce failure points and failure rates.

[0012] Another object of the present disclosure is to provide a hydraulic clamp for a machine base, which can achieve effective cleaning and reduce the adverse effects of residual iron filings.

[0013] Another object of the present disclosure is to provide a hydraulic clamp for a machine base, which can be more easily adapted to machine bases of various specifications and reduce the adjustment process.

[0014] To achieve at least one of the above-mentioned purposes, according to one aspect of the present disclosure, there is provided a hydraulic clamp for a machine base, comprising: an axial positioning member, which is fixed to a mounting plate of a machine tool and is arranged to abut a first end of the machine base in an axial direction; a centering mechanism, which is fixed to the mounting plate of the machine tool and extends in an axial direction, wherein the centering mechanism is arranged to be able to extend into an inner hole of the machine base to provide a radial clamping force supporting the machine base from the inner side of the machine base; and an end face clamping mechanism, which is arranged to abut a second end of the machine base and apply an axial clamping force to the second end toward the first end, and in particular, the end face clamping mechanism is rigidly connected to the centering mechanism.

[0015] In the present disclosure, the tailstock clamping cylinder is removed, and the end face clamping mechanism is rigidly connected to the centering mechanism and then to the machine tool, so that the hydraulic clamp as a whole forms a rigid whole with the fourth axis and the machine tool worktable, thereby increasing the structural stability and rigidity.

[0016] Further, the axial positioning member includes: a positioning ring, which is in a circular ring shape and has a first surface for engaging with a machine tool and a second surface opposite to the first surface; and a plurality of positioning bosses, which protrude from the second surface of the positioning ring in the axial direction and are arranged at equal intervals in the circumferential direction, and the plurality of positioning bosses abut the first end of the machine base and make the central axis of the machine base colinear with the central axis of the positioning ring.

[0017] Furthermore, the centering mechanism includes: a column, which is arranged concentrically with the positioning ring and has a fixed end fixed to the machine tool and a protruding end for supporting the machine base from the inner side of the machine base; and a plurality of centering pressure blocks, which are arranged at equal intervals on the outer circumferential surface of the protruding end, and the plurality of centering pressure blocks are configured to be able to extend or retract in a radial direction relative to the outer circumferential surface of the column to apply radial clamping force to the machine base or release radial clamping force.

[0018] Furthermore, the end face clamping mechanism includes: a cylinder seat, a first side of which is rigidly connected to the protruding end of the column; and a plurality of clamping cylinders, which are circumferentially and evenly spaced apart on a second side of the cylinder seat opposite to the first side, wherein the end face clamping mechanism is configured such that: when the machine base is clamped on the hydraulic clamp, the cylinder seat is located in the inner hole of the machine base, and the plurality of clamping cylinders extend from the second end of the machine base and apply axial clamping force to the second end.

[0019] In the present disclosure, by setting the above structure, the axial clamping force of the clamping cylinder can be increased to the maximum extent possible without worrying about the tilting deformation of the machine tool, thereby ensuring the overall rigidity and clamping stability of the equipment, and further ensuring the processing quality of the product. At the same time, this structure omits the tailstock and the auxiliary support device arranged on the side of the fixture, greatly simplifying the structure and saving space. This simplified structure further reduces the interference points between the robot and the fixture during the automated matching process, reduces the points where failures occur, and further increases reliability and stability.

[0020] Furthermore, it also includes an auxiliary support cylinder, which is fixed on the workbench of the machine tool and is located below the end surface clamping mechanism to provide radial support force to the second end of the machine base.

[0021] In the present disclosure, by adding the auxiliary support cylinder, the structural rigidity during milling processing can be improved, and the machine base can be prevented from falling when the tool cuts from left to right above the machine base. The overall bending strength and clamping stability of the fixture are increased, ensuring the stability and reliability of the processing quality.

[0022] Furthermore, the hydraulic clamp according to the present disclosure also includes a cleaning system, which includes a water supply pipeline and a plurality of water spray nozzles arranged on the water supply pipeline. The cleaning system is configured so that the water spray nozzles are directed toward the axial positioning member, the centering mechanism and the end face clamping mechanism to promptly and effectively clean these parts and the clamped machine base.

[0023] In the present disclosure, by setting up the cleaning system, iron filings or other contaminants remaining on the fixture or machine base and the workbench before or after clamping the machine base can be effectively removed, and iron filings or other contaminants generated during the milling process can be promptly removed, which is beneficial to improve the cleanliness of the fixture and machine base and further ensure the processing quality.

[0024] Preferably, the cleaning system includes a flushing water pipe arranged on the axial positioning member to clean each surface of the axial positioning member. The arrangement of the flushing water pipe further ensures the cleanliness and surface flatness of the axial positioning member, which is conducive to the accurate installation and positioning of the axial positioning member.

[0025] Furthermore, it comprises a hydraulic control system, which adjusts the aforementioned axial pressing force, radial pressing force and the height and supporting force of the auxiliary supporting cylinder by controlling the oil pressure.

[0026] Furthermore, a plurality of spare axial positioning members with different axial sizes may be included to adapt to machine bases with different axial sizes.

[0027] By setting up axial positioning parts with different sizes, the clamping requirements of machine bases of different models and sizes are met. In particular, when a machine base of different sizes needs to be replaced, it is only necessary to remove the original axial positioning parts from the machine tool and then install the axial positioning parts with the size adapted to the new machine base, which reduces the operation of moving and aligning the equipment, simplifies the procedure, greatly reduces the labor intensity of workers, saves the time of changing models, and thus improves the processing efficiency.

[0028] Exemplarily, the aforementioned machine tool is the fourth axis of a vertical machining center, and the mounting plate of the machine tool is arranged on the rotary table of the fourth axis.

[0029] To sum up, the hydraulic clamp for the machine base according to the present invention can stably support the machine base and ensure the processing quality of the machine base; it has a simpler structure, thereby saving costs, simplifying operations, and reducing failure points and failure rates; it can achieve effective cleaning and reduce the adverse effects of residual iron filings, and can more easily adapt to machine bases of various specifications, reducing the adjustment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The features and advantages of one or more embodiments of the present invention will become more easily understood through the following description with reference to the accompanying drawings. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. The drawings are not drawn to scale and some features may be enlarged or reduced to show the details of specific components. In the drawings:

[0031] Figure 1 is a schematic diagram of a hydraulic clamp for a machine stand according to an embodiment of the present disclosure with a machine stand installed.

[0032] Figure 2 It is a three-dimensional schematic diagram of a hydraulic clamp for a machine base according to an embodiment of the present disclosure.

[0033] Figure 3 It is a side schematic diagram of a hydraulic clamp for a machine base according to an embodiment of the present disclosure.

[0034] Description of Figure Numbers:

[0035] 1Machine tool S base

[0036] 2 Workbench S1 first end

[0037] 10 Turntable S2 Second End

[0038] 20 axial positioning member 22 positioning ring

[0039] 24 positioning boss 26 flushing water pipe

[0040] 30 centering mechanism 32 column

[0041] 34 centering block 36 flange

[0042] 40 end face clamping mechanism 42 cylinder seat

[0043] 50 auxiliary support cylinder 44 clamping cylinder

[0044] 60 water supply pipeline 62 water spray outlet DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well.

[0047] In the following, the scenario of milling the base foot in an automated machine tool will be described as an example, where the machine tool is, for example, the fourth axis of a vertical machining center, wherein the hydraulic clamp according to the present disclosure can be installed on the rotary table of the fourth axis.

[0048] Figure 1 A schematic diagram of a hydraulic clamp for a machine base according to an embodiment of the present disclosure with a machine base installed is shown, Figure 2 and Figure 3 They are respectively a three-dimensional schematic diagram and a side schematic diagram of a hydraulic clamp for a machine base according to an embodiment of the present disclosure. As shown in the figure, the hydraulic clamp for a machine base according to an embodiment of the present disclosure includes: an axial positioning member 20, which is fixed to the mounting plate of the machine tool 1 and is arranged to abut against the first end S1 of the machine base S; a centering mechanism 30, which is fixed to the mounting plate of the machine tool 1 and extends in the axial direction, wherein the centering mechanism 30 is arranged to be able to extend into the inner hole of the machine base S to provide a radial clamping force supporting the machine base S from the inner side of the machine base S; and an end face clamping mechanism 40, which is arranged to abut against the second end S2 of the machine base S and apply an axial clamping force toward the first end S1 to the second end S2, and in particular, unlike the existing clamp, the end face clamping mechanism 40 is rigidly connected to the centering mechanism 30, rather than provided by an independently arranged tailstock.

[0049] In the present disclosure, the tailstock clamping cylinder is removed, and the end face clamping mechanism 40 is rigidly connected to the centering mechanism 30 and further to the fourth axis (machine tool), so that the hydraulic clamp as a whole forms a rigid whole with the fourth axis and the machine tool worktable, thereby increasing the structural stability and rigidity.

[0050] The following will be combined Figure 2 and Figure 3 Each component is further described in detail.

[0051] The axial positioning member 20 is used to determine the axial direction of the base when it is clamped and to provide axial support for the first end of the base. Figure 2 and Figure 3As shown, the axial positioning member 20 includes: a positioning ring 22, which is annular and has a first surface for engaging with the turntable 10 and a second surface opposite to the first surface; and a plurality of positioning bosses 24, which protrude from the second surface of the positioning ring 22 in the axial direction and are arranged at equal intervals in the circumferential direction, and are used to abut against the first end S1 of the machine base S and make the central axis of the machine base and the central axis XX of the positioning ring 22 colinear. Therefore, the direction of the central axis XX represents the axial direction of the hydraulic clamp and also represents the direction of the central axis when the machine base S is clamped.

[0052] The centering mechanism 30 is used to support the machine base from the inside of the machine base. Figure 2 and Figure 3 As shown, the centering mechanism 30 includes: a column 32, which is arranged concentrically with the positioning ring 22 and has a fixed end fixed to the turntable 10 and a protruding end for supporting the machine base S from the inner side of the machine base S; and a plurality of centering pressure blocks 34, which are arranged at equal intervals on the outer peripheral surface of the protruding end, and the plurality of centering pressure blocks 34 are configured to be able to extend or retract in the radial direction relative to the outer peripheral surface of the column 32 to apply radial clamping force to the machine base S or release radial clamping force. The extension or retraction of the centering pressure blocks 34 is controlled by a hydraulic control system (not shown), that is, the radial clamping force is adjusted by the hydraulic control system.

[0053] The end surface clamping mechanism 40 is used to apply an axial clamping force to the second end of the base to clamp the base between the end surface clamping mechanism 40 and the axial positioning member 20. Figure 2 and Figure 3 As shown, the end face pressing mechanism 40 includes: a cylinder seat 42, a first side of the cylinder seat 42 is rigidly connected to the protruding end of the column 32, as an example, Figure 2 As shown, the cylinder seat 42 is fixed to the flange 36 of the protruding end of the column 32 via bolts; and a plurality of clamping cylinders 44 are arranged at equal intervals along the circumferential direction on the second side surface of the cylinder seat 42 opposite to the first side surface, wherein the end surface clamping mechanism 40 is arranged so that: when the machine base S is clamped on the hydraulic clamp, the cylinder seat 42 is located in the inner hole of the machine base S, and the plurality of clamping cylinders 44 extend from the second end S2 of the machine base S and apply axial clamping force to the second end S2. Among them, an oil pipeline connected to the clamping cylinder 44 is arranged in the cylinder seat 42, so that the axial clamping force of the clamping cylinder 44 can be adjusted by the hydraulic control system.

[0054] By using the end face clamping mechanism 40 with the above structure, the clamping force of the clamping cylinder 44 can be increased to the maximum extent possible without considering the tilt deformation of the fourth axis, thereby ensuring the overall rigidity and clamping stability of the equipment, and further ensuring the processing quality of the product. At the same time, this structure omits the tailstock and the auxiliary support device arranged on the side of the fixture, greatly simplifying the structure and saving space. This simplified structure further reduces the interference points between the robot and the fixture during the automated matching process, and reduces the failure points, thereby increasing reliability and stability.

[0055] Furthermore, the hydraulic clamp according to the present disclosure also includes an auxiliary support cylinder 50, which is fixed on the workbench 2 of the machine tool 1 and is located below the end face clamping mechanism 40 to provide radial support force to the second end S2 of the machine base S. By adding the auxiliary support cylinder 50, the structural rigidity during milling can be improved, and the machine base can be prevented from falling when the tool cuts in from left to right above the machine base, thereby increasing the overall bending strength and clamping stability of the clamp, and ensuring stable and reliable processing quality. The auxiliary support cylinder 50 is provided with a spring inside, and the height and support force can be adjusted by the hydraulic control system, thereby providing effective rigid support in the radial direction of the clamp.

[0056] Furthermore, the hydraulic clamp according to the present disclosure also includes a cleaning system, which includes a water supply pipeline 60 and a plurality of water spray ports 62 arranged on the water supply pipeline 60. As shown in the figure, the cleaning system is arranged almost around the clamp to comprehensively and effectively remove the iron filings or other contaminants remaining on the clamp or the base and the workbench before or after clamping the base. More advantageously, the iron filings or other contaminants generated during the milling process can be removed in time. Therefore, the cleaning system is arranged to have at least a plurality of water spray ports facing the axial positioning member 20, the centering mechanism 30 and the end face clamping mechanism 40, preferably, also arranged near the auxiliary support cylinder 50, so as to timely and effectively clean these parts and the clamped base S. In particular, since the axial positioning member 20 is installed on the machine tool 1 and performs axial positioning on the machine base S, the flatness and cleanliness of its surface have an important influence on the processing quality of the machine base. Therefore, in order to ensure the cleanliness of the axial positioning member 20, a separate flushing water pipe 26 is provided on the axial positioning member to clean each surface (including at least the first surface, the second surface and the axial support surface) of the axial positioning member 20. The provision of the cleaning system advantageously improves the cleanliness of the fixture and the machine base, and further ensures the processing quality.

[0057] In actual applications, due to the different sizes of machine bases, the required axial support spacing will also be different. When it is necessary to replace a machine base of different sizes, the existing fixture needs to move the tailstock, which is time-consuming, labor-intensive, complicated to operate, and structurally unstable. In the fixture disclosed in the present invention, multiple axial locating members with corresponding sizes can be provided for machine bases of different sizes. For example, if the axial dimension of the machine base is shorter, an axial locating member with a longer axial dimension can be used for support, and vice versa. When a new machine base needs to be clamped, it is only necessary to remove the original axial locating member from the turntable, and then install the axial locating member whose size is adapted to the new machine base. This reduces the operations of moving and aligning the equipment, simplifies the procedure, greatly reduces the labor intensity of workers, and saves changeover time, thereby improving processing efficiency.

[0058] Summary: The hydraulic clamp for the machine base disclosed in the present invention mainly includes: an axial positioning member, a centering mechanism, an end surface clamping mechanism and an auxiliary support cylinder. The main improvements are:

[0059] 1 The end face clamping mechanism is rigidly connected to the centering mechanism.

[0060] 2 includes a cleaning system surrounding the hydraulic clamp to promptly and effectively clean various parts of the clamp and the clamped machine base.

[0061] 3 may include a plurality of spare axial positioning members with different axial sizes to adapt to machine bases with different axial sizes.

[0062] The advantages of the transformer disclosed in the present invention are as follows:

[0063] 1. The tailstock clamping cylinder is removed, and the end face clamping mechanism is rigidly connected to the centering mechanism and the machine tool, which can maximize the axial clamping force of the clamping cylinder without worrying about the tilting and deformation of the machine tool, ensuring the overall rigidity and clamping stability of the equipment, thereby ensuring the processing quality of the product.

[0064] 2 The tailstock and the auxiliary support device arranged on the side of the fixture are omitted, which greatly simplifies the structure and saves space.

[0065] 3. The simplified structure reduces the interference points between the robot and the fixture during the automated matching process, reduces the number of failure points, and further increases reliability and stability.

[0066] 4 By adding the auxiliary support cylinder, the structural rigidity during milling can be improved, and the overall bending strength and clamping stability of the fixture can be increased.

[0067] 5. The cleaning system can effectively remove the iron filings on the fixture, machine base and workbench, further ensuring the processing quality.

[0068] 6 includes a flushing water pipe arranged on the axial positioning member, which further ensures the cleanliness and surface flatness of the axial positioning member, and is conducive to the accurate installation and positioning of the axial positioning member.

[0069] 7. By setting axis positioning parts with different sizes, the clamping requirements of machine bases of different models and sizes are met.

[0070] It also simplifies the ring operation and saves the changeover time.

[0071] To sum up, the hydraulic clamp for the machine base according to the present invention can stably support the machine base and ensure the processing quality of the machine base; it has a simpler structure, thereby saving costs, simplifying operations, and reducing failure points and failure rates; it can achieve effective cleaning and reduce the adverse effects of residual iron filings, and can more easily adapt to machine bases of various specifications, reducing the adjustment process.

[0072] Various embodiments and variations of the present invention have been described in detail above, but those skilled in the art should understand that the present invention is not limited to the above-mentioned specific embodiments and variations but may include other possible combinations and combinations, and other variations and modifications may be implemented by those skilled in the art without departing from the essence and scope of the present invention. All these variations and modifications fall within the scope of the present invention. Moreover, all components described herein may be replaced by other technically equivalent components.

Claims

1. A hydraulic clamp for a machine base, comprising: An axial positioning member (20) fixed to a mounting plate of the machine tool (1) and arranged to abut against a first end (S1) of the machine base (S) in an axial direction; a centering mechanism (30), the centering mechanism (30) being fixed to the mounting plate of the machine tool (1) and extending along the axial direction, wherein the centering mechanism (30) is configured to be able to extend into the inner hole of the machine base (S) to provide a radial pressing force supporting the machine base (S) from the inner side of the machine base (S); and an end surface pressing mechanism (40), the end surface pressing mechanism (40) being configured to abut against a second end (S2) of the machine base (S) and to apply an axial pressing force toward the first end (S1) to the second end (S2), It is characterized in that the end surface pressing mechanism (40) is rigidly connected to the centering mechanism (30).

2. The hydraulic clamp for a machine base according to claim 1, characterized in that: The axial positioning member (20) comprises: a positioning ring (22) which is annular and has a first surface for joining to the mounting plate of the machine tool (1) and a second surface opposite to the first surface; and a plurality of positioning bosses (24), the plurality of positioning bosses (24) protruding from the second surface of the positioning ring (22) along the axial direction and arranged at equal intervals in the circumferential direction, The plurality of positioning bosses abut against the first end (S1) of the machine base (S) and make the central axis of the machine base and the central axis of the positioning ring (22) colinear.

3. The hydraulic clamp for a machine base according to claim 2, characterized in that: The centering mechanism (30) comprises: a column (32) arranged concentrically with the positioning ring (22) and having a fixed end fixed to the mounting plate of the machine tool (1) and a protruding end for supporting the machine base (S) from the inner side of the machine base (S); and A plurality of centering pressure blocks (34) are arranged at equal intervals on the outer peripheral surface of the protruding end, and the plurality of centering pressure blocks (34) are configured to be able to extend or retract in a radial direction relative to the outer peripheral surface of the column (32) to apply the radial clamping force to the machine base (S) or release the radial clamping force.

4. The hydraulic clamp for a machine base according to claim 3, characterized in that: The end surface pressing mechanism (40) comprises: a cylinder seat (42), a first side of the cylinder seat (42) being rigidly connected to the protruding end of the column (32); and a plurality of clamping cylinders (44), the plurality of clamping cylinders (44) being arranged at equal intervals along the circumferential direction on a second side surface of the oil cylinder seat (42) opposite to the first side surface, Wherein, the end face clamping mechanism (40) is configured such that: when the machine base (S) is clamped on the hydraulic clamp, the cylinder seat (42) is located in the inner hole of the machine base (S), and the multiple clamping cylinders (44) extend from the second end (S2) of the machine base (S) and apply the axial clamping force to the second end (S2).

5. The hydraulic clamp for a machine base according to claim 1, characterized in that: It also includes an auxiliary support cylinder (50), which is fixed on the workbench (2) of the machine tool (1) and is located below the end surface clamping mechanism (40) to provide radial support force for the second end (S2) of the machine base (S).

6. The hydraulic clamp for a machine stand (S) according to claim 1, characterized in that: Also included is a cleaning system, the cleaning system comprising a water supply pipeline (60) and a plurality of water spray ports (62) arranged on the water supply pipeline (60). The cleaning system is configured so that the multiple water spray ports (62) are directed toward the axial positioning member (20), the centering mechanism (30) and the end face clamping mechanism (40), so as to clean the axial positioning member (20), the centering mechanism (30) and the end face clamping mechanism (40) as well as the clamped machine base (S).

7. The hydraulic clamp for a machine base according to claim 6, characterized in that: The cleaning system comprises a flushing water pipe (26) arranged on the axial positioning member (20) to clean the surface of the axial positioning member (20).

8. The hydraulic clamp for a machine base according to any one of claims 1 to 7, characterized in that: The invention also includes a hydraulic control system, wherein the hydraulic control system adjusts the axial pressing force and the radial pressing force by controlling the oil pressure.

9. The hydraulic clamp for a machine base according to any one of claims 1 to 7, characterized in that: It also includes a plurality of spare axial positioning members with different axial sizes to adapt to machine bases with different axial sizes.

10. The hydraulic clamp for a machine base according to any one of claims 1 to 7, characterized in that: The machine tool (1) is the fourth axis of a vertical machining center, and the mounting plate of the machine tool (1) is arranged on a rotary table (10) of the fourth axis.

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