CN113145781B

CN113145781B - High-speed hydraulic machine with main cylinder stroke not containing idle stroke

Info

Publication number: CN113145781B
Application number: CN202110205509.XA
Authority: CN
Inventors: 秦剑
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2023-01-13
Anticipated expiration: 2041-02-24
Also published as: CN113145781A

Abstract

The invention discloses a high-speed hydraulic press with a main cylinder stroke not containing a no-load stroke, and belongs to the technical field of forging and pressing equipment. An upright post is connected between the upper cross beam and the lower cross beam; a vertically arranged main cylinder is fixed below the upper cross beam, the lower end of the main cylinder is connected with a screw nut mechanism arranged in parallel with the axis of the main cylinder, and the lower end of the screw nut mechanism is connected with a sliding block; the sliding block is vertically and slidably mounted on the upright post; two sides of the lower beam are respectively fixed with a balance cylinder mechanism; the lead angle of the matching threads of the screw and the nut is smaller than the friction angle. According to the invention, a set of screw and nut self-locking mechanism is added between the main cylinder and the sliding block, so that the no-load stroke of the hydraulic press can be completed, and the load on the sliding block which exceeds the nominal force can be transmitted; axial thread gaps of the screw nut caused by gravity are eliminated through a hydraulic balance cylinder mechanism; the main cylinder only participates in the working load stroke of the sliding block and does not participate in the no-load stroke; the hydraulic press has the advantages of large opening, large nominal force stroke, high stroke frequency, low energy consumption and the like.

Description

High-speed hydraulic machine with main cylinder stroke not containing no-load stroke

Technical Field

The invention relates to the technical field of forging equipment, in particular to a high-speed hydraulic machine with a main cylinder stroke not containing a no-load stroke.

Background

With the adoption of new materials such as high-strength steel, jepa steel and the like which are widely used for stamping parts, mechanical arms, robots and the like which are widely applied to automatic stamping lines, new requirements of large opening, large nominal force stroke, high stroke frequency, low energy consumption and the like are provided for stamping equipment, and the machine types of the existing mechanical press, hydraulic press and the like are difficult to meet.

For mechanical presses, mostly crank-link or eccentric-sleeve mechanisms, when the opening height exceeds 1.0 meter, the load stroke is generally 8-12 times/min, but the nominal force stroke is generally not more than 13 mm.

For a rapid hydraulic machine, a main cylinder of the rapid hydraulic machine adopts a piston cylinder and a plunger cylinder for rapid descending and rapid returning, when the opening height exceeds 1 m, although the nominal force stroke of the hydraulic machine can be equal to the opening height, the rapid descending speed is about 700 mm/s, and the rapid returning speed is about 500-600 mm/s, because the stroke of the main cylinder exceeds 1 m, the liquid charging and discharging of the inner cavity of the cylinder body are carried out at the rapid descending time and the liquid discharging is carried out at the upward time, and the energy consumption is larger. In addition, the operating speed of a piston cylinder and a plunger cylinder of the rapid hydraulic press is 2-3 times that of a common hydraulic cylinder, higher requirements are provided for the precision of a cylinder body, the performance of a sealing ring, a hydraulic pump station and a control valve block, and the manufacturing and maintenance difficulty is higher.

Aiming at the defects of a mechanical press and a rapid hydraulic press, the current Chinese patent discloses a mechanical hydraulic composite energy-saving servo hydraulic press (CN 103963334B) with a toggle rod mechanism, which is to improve a slide block hydraulic overload protection device into a main cylinder on the basis of a closed double-point toggle rod press;

however, the above-mentioned techniques have disadvantages:

first, the main cylinder is installed in the slide block, the diameter and height dimensions cannot be made too large, otherwise the slide block has a huge structure and is multiplied in weight, and high-speed operation cannot be carried out. If the working oil pressure of the hydraulic cylinder is 25 MPa generally, if the hydraulic cylinder bears 400 tons of load, the diameter of the piston is more than 450 millimeters, the diameter of the cylinder body outside installation is 670 millimeters, and the weight of the whole main cylinder is more than 3 tons. The consequence of the weight increase of the sliding block part is that the running speed of the sliding block must be reduced, otherwise, when the sliding block runs along the up-down direction and at the high speed of acceleration and deceleration, the shaking of the press machine can be caused by overlarge inertia force, and the precision of the machine tool is influenced;

secondly, the toggle rod mechanism applies a lever force increasing principle and is not suitable for being applied to a large-stroke press, if the stroke of a slide block reaches 1 meter, the whole mechanism is too large, the weight is increased, the inertia force of a movement mechanism is too large, and a machine tool can shake and cannot normally run when the speed is increased and reduced.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a high-speed hydraulic machine with a main cylinder stroke not comprising a no-load stroke. The main cylinder only participates in the working load stroke and does not participate in the quick stroke, and the hydraulic control system has the advantages of large opening, large nominal force stroke, high stroke frequency, low energy consumption and the like.

In order to achieve the purpose, the invention adopts the technical scheme that: a high-speed hydraulic press with a main cylinder stroke not containing a no-load stroke comprises an upper cross beam and a lower cross beam, wherein an upright post is connected between the upper cross beam and the lower cross beam; a vertically arranged main cylinder is fixed below the upper cross beam, the lower end of the main cylinder is connected with a screw nut mechanism arranged in parallel with the axis of the main cylinder, and the lower end of the screw nut mechanism is connected with a sliding block; the slider is vertically slidably mounted on the upright post.

It further comprises the following steps: the screw and nut mechanism comprises a power box, the power box is fixed at the lower end of a piston rod of the main cylinder through a connecting column, and the power box is vertically connected with the upright column in a sliding manner; the power box is provided with a servo motor, the output end of the servo motor is connected with a speed reducer, and the speed reducer is connected with a screw rod; the screw rods are vertically arranged, and nuts are arranged at the lower ends of the screw rods in a matched mode; the nut is fixed on the sliding block.

A cylindrical nut seat is fixed on the sliding block, and the nut is fixed at the upper end of the nut seat; an auxiliary supporting seat covered outside the screw rod is fixed below the power box, a copper sleeve is fixed at the lower end of the auxiliary supporting seat, and the copper sleeve is sleeved on the nut seat in a matching mode.

The servo motors are two in number and are symmetrically arranged in the center of the power box; the speed reducer comprises a gearwheel and two pinions which are meshed with the gearwheel, the gearwheel is arranged in the center of the power box, and the pinions are arranged at the output ends of the corresponding servo motors; the upper end of the screw rod is arranged in the center of the big gear, and the upper end of the screw rod is connected with the inner wall of the big gear through a spline.

Two sides of the lower cross beam are respectively fixed with a balance cylinder mechanism; the balance cylinder mechanism comprises a balancer frame fixedly connected with the lower cross beam, and a control valve block, an energy accumulator and plunger cylinders which are vertically arranged are arranged on the balancer frame; the control valve block is respectively communicated with the plunger cylinder and the energy accumulator through an oil pipe, and is also communicated with the oil replenishing pump station system through another oil pipe; and lifting lugs are respectively fixed on two sides of the sliding block and vertically opposite to the plunger cylinder in the balance cylinder mechanism.

The balancer frame is formed by welding or casting a plunger cylinder seat, a valve block bracket, an energy accumulator pillar and a frame bottom plate; the frame bottom plate is connected and installed on the lower cross beam through bolts; the plunger cylinder is installed on the plunger cylinder seat in a bolt connection mode; the control valve block is connected and installed on the valve block bracket through a bolt; the energy accumulator is fixed on one side of the energy accumulator support through the supporting plate and the hoop.

The number of the upright columns is four, the four upright columns are arranged in a rectangular shape, and the upper cross beam, the upright columns and the lower cross beam are fixedly connected through pull rod nuts; a working table plate opposite to the sliding block is fixed on the lower cross beam; the inner side of the upright post is provided with an upright post guide rail, the upright post guide rail comprises a rectangular right-angle guide rail, and the rectangular right-angle guide rail is fixed on the inner side of the upright post through a plurality of fixing blocks; and the four corners of the power box and the slide block are respectively fixed with a slide block guide rail which is vertically matched with the rectangular right-angle guide rail in a sliding manner.

The lead angle of the matched threads of the screw and the nut is smaller than the friction angle, and the screw and the nut adopt single-head trapezoidal threads or single-head rectangular threads.

The number of the main cylinders is two, and the number of the screw and nut mechanisms is one; the screw and nut mechanism is arranged in the middle of the two main cylinders.

The number of the main cylinders is three, the number of the screw and nut mechanisms is two, and the main cylinders and the screw and nut mechanisms are alternately arranged; the screw and nut mechanism is positioned in the middle of two adjacent main cylinders.

The invention has the beneficial effects that:

1. through the screw and nut mechanism, the no-load stroke of the hydraulic press can be completed, and the nominal force load transmission can be carried out. The screw and nut mechanism is added: firstly, the parameter target of the high-speed hydraulic press can be realized; when the opening height exceeds 1 meter, the fast forward speed, i.e. the fast down and fast back speed, can exceed 800 mm/s; the nominal force stroke can be customized according to the requirements of customers, and the nominal force stroke is about 300 mm in normal standard configuration; the master cylinder does not participate in the fast forward stroke, so that the energy consumption is low. The main cylinder has low technical requirement; the main cylinder only participates in the working stroke, and has the characteristics of short stroke and low speed, and the cylinder body precision, the sealing ring performance, the hydraulic pump station and the valve block are similar to the technical requirements of the common main cylinder;

2. the no-load quick stroke is completed by adopting a screw and nut mechanism with simple structure and light weight, so that the problems that a multi-connecting-rod mechanism is easy to generate machine tool vibration and reduce the machine tool precision when the stroke of a press machine is large and the speed is high are solved; the weight of the screw and nut mechanisms acts on the power box, the power box only participates in the slow travel of the slide block during loading, the weight of the slide block part only increases the weight of the nut seat, then the balance cylinder mechanism offsets the gravity, and the high-speed stable operation is easy to realize;

3. the balance cylinder mechanism is additionally arranged, a plunger cylinder, a valve block, an energy accumulator and the like of the balance cylinder mechanism form a hydraulic spring, hydraulic jacking force which is larger than the weight of the sliding block component and has an approximate constant value acts on the lifting lugs through a plunger cylinder piston, the lifting lugs are fixed on two sides of the sliding block to lift the sliding block component upwards until the tooth surfaces of the screw rod and the nut are contacted and attached firmly, and therefore the aims of eliminating axial gaps of threads and improving the repeated positioning accuracy of the bottom dead center of the sliding block are achieved.

Drawings

FIG. 1 is a front view of an embodiment of the present invention;

FIG. 2 is a left side view of an embodiment of the present invention;

FIG. 3 is a top view of the present invention;

FIG. 4 is a perspective view of an embodiment of the present invention;

FIG. 5 is an enlarged view of a screw and nut mechanism according to a first embodiment of the present invention;

FIG. 6 is an enlarged view of a speed reducer according to a first embodiment of the present invention;

FIG. 7 is an enlarged view of the balance cylinder mechanism according to the first embodiment of the present invention;

fig. 8 is an enlarged view of the balancer frame according to one embodiment of the present invention;

FIG. 9 is an enlarged view of a column rail and a block rail according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view of the screw and nut of the present invention (trapezoidal thread)

FIG. 11 is a cross-sectional view of a screw and a nut (rectangular thread)

FIG. 12 is a front view of the second embodiment of the present invention;

FIG. 13 is a top view of the third embodiment of the present invention;

in the figure: 1. the hydraulic balance device comprises a draw bar nut, 2, an upper cross beam, 3, an upright post, 4, a screw and nut mechanism, 5, an upright post guide rail, 6, a sliding block, 7, a working table plate, 8, a lower cross beam, 9, a balance cylinder mechanism, 10, a main cylinder, 11, a servo motor, 12, a connecting column, 13, a speed reducer, 14, a sliding block guide rail, 15, a screw, 16, an auxiliary supporting seat, 17, a nut, 18, a copper sleeve, 19, a nut seat, 20, a power box, 21, an energy accumulator, 22, a plunger cylinder, 23, a hoop, 24, a supporting plate, 25, a balancer frame, 26, a control valve block, 27, a lifting lug, 28, a rectangular right-angle guide rail, 29, a fixed block, 30, a pinion, 31, a gearwheel, 32, a plunger cylinder seat, 33, a frame bottom plate, 34, a valve block support, 35 and an energy accumulator support.

Detailed Description

The invention will be further explained with reference to the drawings.

Example one

Referring to fig. 1 to 4, a high-speed hydraulic press with a main cylinder stroke not including a no-load stroke is provided, wherein a split type frame comprises an upper cross beam 2, a lower cross beam 8 and four upright posts 3, the four upright posts 3 are arranged in a rectangular shape, and the upper cross beam 2, the upright posts 3 and the lower cross beam 8 are fixedly connected through a pull rod nut 1. A vertically arranged main cylinder 10 is fixed below the upper cross beam 2, the lower end of the main cylinder 10 is connected with a screw and nut mechanism 4 which is arranged in parallel with the axis of the main cylinder 10, and the lower end of the screw and nut mechanism 4 is connected with a sliding block 6. The number of the master cylinders 10 is two, the number of the screw and nut mechanisms 4 is one, and the screw and nut mechanisms 4 are installed at the middle positions of the two master cylinders 10. The sliding block 6 is vertically and slidably mounted on the upright post 3, and the lower cross beam 8 is fixedly provided with a working table plate 7 opposite to the sliding block 6.

Referring to fig. 5 and 6, the screw and nut mechanism 4 includes a power box 20, the upper side of the power box 20 is fixed at the lower end of the piston rod of the master cylinder 10 through two connecting columns 12, and the power box 20 is vertically connected with the upright post 3 in a sliding manner. The power box is fixedly connected with the piston rod of the main cylinder through the connecting column, so that the size and the weight of the power box can be reduced. The power box 20 is provided with two servo motors 11, and the two servo motors 11 are symmetrically arranged at the center of the power box 20. The reducer 13 comprises a gearwheel 31 and two pinions 30 engaged with the gearwheel 31, the gearwheel 31 is mounted in the center of the power box 20, and the pinions 30 are mounted at the output ends of the corresponding servo motors 11. The speed reducer 13 adopts a symmetrical design, so that the gravity center of a power box component is positioned on the geometric center of the power box component, and the problem of instability caused by unbalanced gravity of the power box is avoided; the two servo motors 11 are controlled by a hydraulic machine master control system to realize synchronous operation.

The upper end of the screw rod 15 is arranged in the center of the big gear 31, the upper end of the screw rod 15 is connected with the inner wall of the big gear 31 through a spline, and the lower end of the screw rod 15 is provided with a nut 17 in a matching way. A cylindrical nut seat 19 is fixed on the sliding block 6, and a nut 17 is fixed at the upper end of the nut seat 19. An auxiliary supporting seat 16 covered outside the screw 15 is fixed below the power box 20, a copper sleeve 18 is fixed at the lower end of the auxiliary supporting seat 16, and the copper sleeve 18 is sleeved on the nut seat 19 in a matching manner to realize sliding in a movable fit manner. The auxiliary support base 16 can avoid the phenomenon that the screw rod is broken due to the deflection of the nut and the bending of the screw rod when the hydraulic press works and the slide block bears the eccentric load force.

Referring to fig. 7 and 8, a balance cylinder mechanism 9 is fixed to each of both sides of the lower beam 8. The balance cylinder mechanism 9 comprises a balance frame 25 fixedly connected with the lower cross beam 8, and the balance frame 25 is formed by welding or casting a plunger cylinder seat 32, a valve block bracket 34, an energy accumulator pillar 35 and a frame bottom plate 33. The balancer frame 25 is in a modular integrated design, and can be assembled after the balancing cylinder mechanisms are independently assembled, so that the combination and the disassembly are convenient, and the maintainability is good.

The frame bottom plate 33 is connected and installed on the lower cross beam 8 through a bolt; the plunger cylinder 22 is installed on the plunger cylinder seat 32 in a bolt connection mode; the control valve block 26 is mounted on the valve block bracket 34 by bolting; the energy accumulator 21 is fixed on one side of the energy accumulator pillar 35 through the supporting plate 24 and the hoop 23. The control valve block 26 is respectively communicated with the plunger cylinder 22 and the energy accumulator 21 through oil pipes, and the control valve block 26 is also communicated with an oil supplementing pump station system through another oil pipe. Two sides of the sliding block 6 are respectively fixed with a lifting lug 27, and the lifting lugs 27 are vertically opposite to the plunger cylinder 22 in the balance cylinder mechanism 9; the plunger cylinder 22, the valve block 26, the accumulator 21 and the like constitute a hydraulic spring, and hydraulic elastic force is applied to a lug 27 fixed to the slider through the plunger cylinder piston.

The plunger cylinder, the valve block, the energy accumulator and the like of the balance cylinder mechanism form a hydraulic spring, hydraulic jacking force which is larger than the weight of the sliding block component and has an approximate constant value acts on the lifting lug through a plunger cylinder piston, the lifting lug lifts the sliding block component upwards through being fixed on two sides of the sliding block until the tooth surfaces of the screw and the nut are contacted and attached tightly, and therefore the purposes of eliminating axial gaps of threads and improving the repeated positioning precision of the bottom dead center of the sliding block are achieved.

Referring to fig. 9, the column guide 5 is disposed inside the column 3, the column guide 5 includes a rectangular right-angle guide 28, and the rectangular right-angle guide 28 is fixed inside the column 3 by a plurality of fixing blocks 29. The four corners of the power box 20 and the slide block 6 are respectively fixed with a slide block guide rail 14, and the slide block guide rail 14 is vertically matched with a rectangular right-angle guide rail 28 in a sliding manner. The fixed block 29 is provided with a screw for adjustment, and the screw can adjust the clearance between the rectangular guide rail and the friction pair of the slide rail 14 of the power box 20 and the slide rail 14 of the slide block 6, so that the power box and the slide block can slide up and down along the direction of the rectangular right-angle guide rail.

As shown in fig. 10 and 11, the lead angle of the mating threads of the screw 15 and the nut 17 is smaller than the friction angle, and thread self-locking can be achieved. In this embodiment, the screw 15 and the nut 17 are single-start trapezoidal threads or single-start rectangular threads, and are easily designed such that the lead angle is smaller than the friction angle, thereby achieving the requirement of thread self-locking. Secondly, the single-end thread has no split machining error of the multi-end thread, the manufacturing difficulty is small, and the trapezoidal thread and the rectangular thread have the advantage of large bearing capacity.

Compared with the common hydraulic machine, the embodiment adds a set of screw and nut mechanism between the main cylinder and the slide block of the hydraulic machine, thereby not only completing the no-load stroke of the hydraulic machine, but also carrying out the nominal force load transmission. The advantages of the mechanism are added: firstly, the parameter target of the high-speed hydraulic press can be realized; when the opening height exceeds 1 meter, the fast forward speed, i.e. the fast down and fast back speed, can exceed 800 mm/s; the nominal force stroke can be customized according to the requirements of customers, and the nominal force stroke is about 300 mm in normal standard configuration; the master cylinder does not participate in the fast forward stroke, so that the energy consumption is low. Secondly, the technical threshold is low; the main cylinder only participates in the working stroke, and has the characteristics of short stroke and low speed, and the technical requirements of the cylinder body precision, the sealing ring performance, the hydraulic pump station and the valve block are similar to those of the common hydraulic machine.

Secondly, the no-load quick stroke is completed by adopting a screw and nut mechanism, a crank connecting rod mechanism or a toggle rod mechanism is not used, the crank connecting rod mechanism or the toggle rod mechanism is a multi-connecting rod mechanism in principle, and when the stroke of the press is large and the speed is high, the structure is large, the weight is increased, the machine tool is easy to shake, and the machine tool precision is reduced.

Moreover, when the hydraulic press works, the weight of the screw and nut mechanism acts on the power box, and the power box only participates in the slow stroke when the sliding block is loaded. And the weight of the slide block part only increases the weight of the nut seat, and the balance cylinder mechanism offsets the gravity, so that high-speed stable operation is easy to realize.

The working principle is as follows:

the column guide rail adopts an ultra-long guide rail design according to a formula;

the method comprises the following steps that (1) the stroke of a hydraulic machine = no-load stroke + load stroke = screw nut stroke + master cylinder piston stroke = sliding distance of a sliding block + sliding distance of a power box;

the stroke of the hydraulic machine can be realized by the random combination of the stroke of the screw and the nut and the stroke of the cylinder piston;

when the hydraulic press works and the slide block 6 is fast lowered from the top dead center position,

a servo motor 11 on a power box 20 drives a speed reducer 13, and the speed reducer drives a screw 15 and a nut 17 to push a sliding block 6 to move downwards; when the hydraulic machine reaches a preset position quickly, the servo motor stops, and the screw nut can realize thread self-locking and bear an axial load exceeding the nominal force of the hydraulic machine;

the piston of a main cylinder 10 of the upper cross beam begins to extend out to push a screw nut on the power box, and the slide block is driven to continuously move downwards to realize the feeding of a working load;

after the slide block reaches the position of a bottom dead center and is subjected to pressure maintaining for a period of time, the mold drawing return stage is started, the piston of the main cylinder reversely runs, and the main cylinder is contracted to the original position and stops after the mold drawing stroke is finished;

the servo motor is started and reversely rotated along with the rotation, and the slide block is continuously driven to rapidly move upwards to the upper dead point through the speed reducer and the screw nut mechanism to complete resetting.

Example two

As shown in fig. 12 and 13, the difference between the second embodiment and the first embodiment is: the number of the main cylinders 10 is three, the number of the screw and nut mechanisms 4 is two, and the main cylinders 10 and the screw and nut mechanisms 4 are alternately arranged; the screw-nut mechanism 4 is located at a middle position of the adjacent two master cylinders 10.

Claims

1. A high-speed hydraulic machine with a main cylinder stroke not containing a no-load stroke comprises an upper cross beam (2) and a lower cross beam (8), wherein an upright post (3) is connected between the upper cross beam (2) and the lower cross beam (8); the method is characterized in that: a vertically arranged main cylinder (10) is fixed below the upper cross beam (2), the lower end of the main cylinder (10) is connected with a screw and nut mechanism (4) which is arranged in parallel with the axis of the main cylinder (10), and the lower end of the screw and nut mechanism (4) is connected with a sliding block (6); the sliding block (6) is vertically and slidably mounted on the upright post (3);

the screw and nut mechanism (4) comprises a power box (20), the power box (20) is fixed at the lower end of a piston rod of the main cylinder (10) through a connecting column (12), and the power box (20) is vertically connected with the upright post (3) in a sliding manner; the power box (20) is provided with a servo motor (11), the output end of the servo motor (11) is connected with a speed reducer (13), and the speed reducer (13) is connected with a screw (15); the screw (15) is vertically arranged, and the lower end of the screw (15) is provided with a nut (17) in a matching way; the nut (17) is fixed on the sliding block (6);

a cylindrical nut seat (19) is fixed on the sliding block (6), and the nut (17) is fixed at the upper end of the nut seat (19); an auxiliary supporting seat (16) covered outside the screw rod (15) is fixed below the power box (20), a copper sleeve (18) is fixed at the lower end of the auxiliary supporting seat (16), and the copper sleeve (18) is sleeved on the nut seat (19) in a matching manner; lead angles of matched threads of the screw rod (15) and the nut (17) are smaller than a friction angle, and the screw rod (15) and the nut (17) adopt single-head trapezoidal threads or single-head rectangular threads;

two sides of the lower cross beam (8) are respectively fixed with a balance cylinder mechanism (9); the balance cylinder mechanism (9) comprises a balance frame (25) fixedly connected with the lower cross beam (8), and a control valve block (26), an energy accumulator (21) and a plunger cylinder (22) which is vertically arranged are installed on the balance frame (25); the control valve block (26) is respectively communicated with the plunger cylinder (22) and the energy accumulator (21) through oil pipes, and the control valve block (26) is also communicated with an oil supplementing pump station system through another oil pipe; two sides of the sliding block (6) are respectively fixed with a lifting lug (27), and the lifting lugs (27) are vertically opposite to the plunger cylinder (22) in the balance cylinder mechanism (9).

2. A high speed hydraulic machine according to claim 1 in which the master cylinder stroke does not include an idle stroke, wherein: the servo motors (11) are two in total, and the two servo motors (11) are symmetrically arranged in the center of the power box (20); the speed reducer (13) comprises a large gear (31) and two small gears (30) meshed with the large gear (31), the large gear (31) is installed in the center of the power box (20), and the small gears (30) are installed at the output ends of the corresponding servo motors (11); the upper end of the screw rod (15) is installed in the center of the large gear (31), and the upper end of the screw rod (15) is connected with the inner wall of the large gear (31) through a spline.

3. A high speed hydraulic machine according to claim 1 in which the master cylinder stroke does not include an idle stroke, wherein: the balancer frame (25) is formed by welding or casting a plunger cylinder seat (32), a valve block bracket (34), an energy accumulator strut (35) and a frame bottom plate (33); the frame bottom plate (33) is connected and installed on the lower cross beam (8) through bolts; the plunger cylinder (22) is connected to the plunger cylinder seat (32) through bolts; the control valve block (26) is installed on the valve block bracket (34) through bolt connection; the energy accumulator (21) is fixed on one side of the energy accumulator support column (35) through the supporting plate (24) and the hoop (23).

4. A high speed hydraulic machine according to claim 1 in which the master cylinder stroke does not include an idle stroke, wherein: the four upright posts (3) are arranged in a rectangular shape, and the upper cross beam (2), the upright posts (3) and the lower cross beam (8) are fixedly connected through pull rod nuts (1); a working table plate (7) opposite to the sliding block (6) is fixed on the lower cross beam (8); the inner side of the upright post (3) is provided with an upright post guide rail (5), the upright post guide rail (5) comprises a rectangular right-angle guide rail (28), and the rectangular right-angle guide rail (28) is fixed on the inner side of the upright post (3) through a plurality of fixing blocks (29); four corners position of headstock (20) and slider (6) is fixed with slider guide rail (14) respectively, slider guide rail (14) and the vertical sliding fit of rectangle right angle guide rail (28).

5. A high-speed hydraulic machine according to any one of claims 1 to 4 in which the master cylinder stroke does not include an idle stroke, wherein: the number of the main cylinders (10) is two, and the number of the screw and nut mechanisms (4) is one; the screw and nut mechanism (4) is arranged in the middle of the two main cylinders (10).

6. A high-speed hydraulic machine according to any one of claims 1 to 4 in which the master cylinder stroke does not include an idle stroke, wherein: the number of the main cylinders (10) is three, the number of the screw and nut mechanisms (4) is two, and the main cylinders (10) and the screw and nut mechanisms (4) are alternately arranged; the screw and nut mechanism (4) is positioned in the middle of two adjacent main cylinders (10).