WO2018058913A1 - Safe and energy-saving hydraulic press - Google Patents

Abstract

A safe and energy-saving hydraulic press, comprising: a main cylinder (1), used for meeting the main tonnage requirement; a fast cylinder (2), used for realizing fast slide-down, demolding, and fast return of a sliding block (3); a sliding block (3), both the main cylinder and the fast cylinder being connected to the sliding block; and a counterweight (4), which is connected to the sliding block by means of a lifting execution means. The minimum total weight Tz of a counterweight is equal to the weight Th of the sliding block plus the total weight Tm of molds on the hydraulic press plus a friction force Ts that needs to be overcome during return of the sliding block. The hydraulic press is able to eliminate the self-weight of a sliding block, and reduce a return force, the overall power and the energy consumption, the oil supply quantity of a device, and the overall heat productivity; as the sliding block has an upward movement trend in an initial state, the device safety is greatly improved; the complex safety protection design in mechanical design, electrical programming, and hydraulic design can be omitted.

Description

A safe and energy-saving hydraulic press Technical field

The invention relates to the field of hydraulic machines, and in particular to a safety and energy-saving hydraulic machine.

Background technique

In the actual application of the hydraulic press, due to the long stroke, in order to improve the working efficiency, the return speed needs to be gradually accelerated (faster is realized by self-weight, cylinder filling valve to absorb oil to achieve oil filling, lower chamber draining), less whole working cycle. The press needs to do work during the whole work process: slow down, work, pressure holding, pressure relief, slow return, quick return, slow return and other auxiliary actions. This part of the work is most generated during the quick return process. The work done on the return journey accounts for more than 80% of the work done by the whole machine.

In the process of returning the slider, the traditional hydraulic machine does a lot of useless work to overcome the self-weight, which makes the power and energy consumption of the whole machine increase; the oil supply and heat generation of the whole machine are too large.

Considering the weight of the slider, in order to prevent the slider from falling, there are multiple protections in the design:

1. Mechanical aspects: The domestic equipment needs to be equipped with a safety latch mechanism for domestic use, and it is also necessary to increase the control oil passage or pneumatic components; the foreign use needs to be equipped with a German sittema safety lock mechanism;

2, electrical aspects: electrical programming interlock, the design is more complicated;

3, hydraulic: hydraulic system design has two or more levels of support to ensure the safety of operators.

Summary of the invention

The technical problem mainly solved by the invention is to provide a safe and energy-saving hydraulic machine, which can greatly reduce the power and energy consumption of the whole machine; improve the safety of the equipment; reduce the oil supply amount of the equipment, and reduce the heat generation of the whole machine.

In order to solve the above technical problem, a technical solution adopted by the present invention is to provide a security and section. The hydraulic machine includes: a master cylinder for meeting the requirements of the main tonnage; a quick cylinder for realizing the quick release, demoulding and quick return of the slider; the slider, the master cylinder and the quick cylinder are all connected with the slider; The counterweight is connected to the slider by the lifting actuator, and the minimum total weight of the counterweight is Tz = the weight of the slider Th + the total weight of the mold on the hydraulic machine Tm + the frictional force Ts overcome by the slider return stroke.

In a preferred embodiment of the present invention, when the slider is lifted along the guide rail, the minimum total weight of the weight is Tz = the weight of the slider Th + the total weight of the mold on the hydraulic machine Tm + the frictional force of the guide rail Td + the frictional force Ts overcome by the slider return stroke.

In a preferred embodiment of the invention, the rail friction force Td = (slider weight Th + total mold weight Tm) x 15%.

In a preferred embodiment of the invention, the master cylinder includes two plunger cylinders, and the two plunger cylinders are symmetrically disposed on both sides of the hydraulic machine.

In a preferred embodiment of the invention, the quick cylinder is disposed at an intermediate position of the hydraulic machine and is coupled to the slider by a double guide rod.

In a preferred embodiment of the present invention, the weight is disposed in two or four uprights on both sides of the hydraulic machine, and the weights on the left and right sides are equal.

In a preferred embodiment of the present invention, the weight is a weight-matched weight, and each of the weights is provided with a guide hole and a hanging hole on both sides.

In a preferred embodiment of the invention, the lifting and lowering device comprises a wire rope and a fixed pulley, and the weighting wire rope is connected to the slider through a fixed pulley.

In a preferred embodiment of the invention, the fixed pulley is either a pulley block.

In a preferred embodiment of the invention, a pressure sensor for determining whether the counterweight is reasonable is provided in the plug chamber and the rod chamber of the quick cylinder.

The invention has the beneficial effects that the invention eliminates the weight of the slider and reduces the return force, thereby greatly reducing The power and energy consumption of the whole machine is reduced, the oil supply of the equipment is reduced, and the heat generation of the whole machine is reduced. Since the initial state of the slider has an upward movement trend, the safety of the equipment is greatly improved; mechanical design and electrical can be eliminated. Complex safety protection design in programming and hydraulic design.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained according to these drawings without any creative work, wherein:

1 is a schematic structural view of a safety and energy-saving hydraulic machine according to a preferred embodiment of the present invention;

Figure 2 is a right side view of the safety and energy saving hydraulic machine shown in Figure 1;

Figure 3 is a schematic view of the distribution of weights in the embodiment;

Figure 4 is a comparison table of energy consumption.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The invention includes:

A safe and energy-saving hydraulic machine, comprising: a master cylinder 1 for meeting a main tonnage requirement; a quick cylinder 2 for realizing a quick release, demoulding and quick return of the slider 3; a slider 3, a master cylinder 1 and a quick cylinder 2 is connected with the slider 3; the counterweight 4, the counterweight is connected with the slider 3 through the lifting and executing device, the minimum total weight of the counterweight 4 is Tz=the slider weight Th+the total weight of the mold on the hydraulic machine Tm+the slider backhaul overcomes Friction Ts.

When the slider 3 moves up and down along the guide rail 5, the minimum total weight of the counterweight 4 is Tz = the weight of the slider Th + hydraulic machine Upper mold total weight Tm + rail friction force Td + frictional force Ts overcome by the slider return stroke.

The rail friction force Td = (slider weight Th + total mold weight Tm) × 15%.

Example 1:

As shown in Figure 1 and Figure 2.

Taking 300t as an example, the master cylinder 1 includes two plunger cylinders. In order to meet the requirements of the main tonnage, the two plunger cylinders are each 150t, and the center line of the hydraulic machine is symmetrically disposed on both sides.

The quick cylinder 2 is arranged in the middle position of the hydraulic machine, and is responsible for the quick release, demolding and quick return of the slider 3. The size of the quick cylinder 2 is configured with a maximum release force of 300KN.

Both the master cylinder 1 and the quick cylinder 2 are mounted on the upper beam 6 by screws. The head flange of the master cylinder 1 is coupled with the slider 3, and the quick cylinder 2 passes through the intermediate transition plate 2-1 and the double guide rod 2-2. Slider 3 is connected.

The weights 4 are disposed on two sides of the hydraulic machine and are disposed in two or four columns, and the weights on both sides are equal. The minimum total weight should exceed 2t (reference value) of the total weight of the slider and the mold, and 2t is the frictional force Ts overcome by the slider return stroke. Ts makes the initial state of the slider 3 move upward.

Due to the upward movement of the slider, the safety of the equipment has been greatly improved; the complicated safety protection design in mechanical design, electrical programming design and hydraulic design can be eliminated.

The counterweight 4 is connected to the slider by means of a lifting actuating device comprising a wire rope 7 and a fixed pulley 8, which is connected to the slider 3 by a fixed pulley 8 with a wire rope 7.

Wherein, the fixed pulley 8 or the pulley block or the fixed pulley system reduces the weight of the weight. The wire rope 7 is in a multi-strand form to ensure safety.

The counterweight 4 needs to overcome the weight of its own weight, the weight of its own weight T = the weight of the slider Th + the weight of the piston rod + the total weight of the upper mold Tm + the friction of the guide rail Td = 5.2t + 1.5t + 6t + 1.9t = 14.6t. According to the above data, the minimum total weight weight Tz=T+Ts=14.6t+2t=16.6t, and the weight of the single side weight is 8.3t.

The counterweight 4 is weight-weighted, as shown in Figure 3. If the weight of the single-side counterweight is 8.3t, it is divided into 6 pieces of 1t weights, 4 pieces of 0.5t weights, and 3 pieces of 0.t weights. Guide holes and lifting holes are provided on each side of each weight block for easy guiding and installation. The counterweight adopts weight-weighted weights, and each of the weights has a guide hole and a hanging hole on both sides.

The pressure of the plug chamber and the rod chamber of the quick cylinder 2 is detected to determine the size of the counterweight. A pressure sensor is installed in the plug cavity and the rod cavity of the fast chamber 2, and it is determined whether the weight is reasonable according to the pressure value.

If the weight of the counterweight is too light or the wire rope is broken, the pressure of the quick cylinder cavity should be greater than 12 MPa (the slider is calculated from the gravity of 14.6t) to avoid the sliding down of the slider and ensure the personal safety of the operator.

The following table uses 300t equipment as an example. The comparison table of each working parameter configuration:

Serial number	Project Description	unit	Existing parameters	The invention configuration
1	Nominal force	KN	3000	3000
2	Return force	KN	600	300
3	Actual working distance	Mm	1400	1400
4	Fast down	Mm/s	300	300
5	Slow down	Mm/s	30	30
6	Work (100% load)	Mm/s	10	4.5
7	Slow back	Mm/s	20	20
8	Quick back	Mm/s	150	300
9	compress time	s	34	34
10	Total motor power		kW	90	8.96
11	Work under no load	% of total power	30	0

As shown in Fig. 4, taking 300t equipment as an example, the process parameters are basically unchanged, and the productivity and energy consumption are slightly improved, and the output and energy consumption are analyzed and compared. As can be seen from Figure 4, the counterweight problem is solved by the counterweight and servo system, the energy saving can reach 89.756%, and the enterprise saves 369,204 yuan (calculated by 1 yuan per kWh).

According to the analysis and comparison of the two sets of data, the weight structure of the invention is used to solve the problem of backhaul energy consumption, and the scheme has high feasibility, greatly reduces energy consumption, achieves the purpose of energy saving improvement, and creates higher efficiency for production.

The invention eliminates the weight of the slider and reduces the return force, thereby greatly reducing the power and energy consumption of the whole machine; The oil supply of small equipment reduces the heat generated by the whole machine; the safety of the equipment is greatly improved due to the upward movement of the slider in the initial state; the complicated design in mechanical design, electrical programming design and hydraulic design can be eliminated. Safety protection design; hydraulic system is reduced in size, increasing maintenance space.

The above is only the embodiment of the present invention, and thus does not limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification of the present invention, or directly or indirectly applied to other related technical fields, The same is included in the scope of patent protection of the present invention.

Claims (10)

1. A safe and energy-saving hydraulic press characterized in that it comprises:

   Master cylinder for meeting the main tonnage requirements;

   Quick cylinder for quick release, demoulding and quick return of the slider;

   The slider, the master cylinder and the quick cylinder are all connected to the slider;

   The counterweight and the counterweight are connected to the slider through the lifting actuator. The minimum total weight of the counterweight is Tz=the weight of the slider Th+the total weight of the mold on the hydraulic machine Tm+the frictional force Ts overcome by the slider return.
2. The safety and energy-saving hydraulic machine according to claim 1, wherein when the slider is lifted along the guide rail, the minimum total weight of the weight is Tz=the slider weight Th+the total weight of the mold on the hydraulic machine Tm+the rail friction force Td+the slider return stroke Overcome the friction Ts.
3. The safety and energy-saving hydraulic machine according to claim 2, wherein the guide rail frictional force Td = (slider weight Th + total mold weight Tm) × 15%.
4. The safety and energy-saving hydraulic machine according to claim 1, wherein the master cylinder comprises two plunger cylinders, and the two plunger cylinders are symmetrically disposed on both sides of the hydraulic machine.
5. The safety and energy-saving hydraulic machine according to claim 1, wherein the quick cylinder is disposed at an intermediate position of the hydraulic machine and is coupled to the slider through the double guide rod.
6. The safety and energy-saving hydraulic machine according to claim 1, wherein the weight is disposed in two or four columns on both sides of the hydraulic machine, and the weights on the left and right sides are equal.
7. The safety and energy-saving hydraulic machine according to claim 6, wherein the weight is a weight-weighted weight, and each of the weights is provided with a guide hole and a hanging hole on both sides.
8. The safety and energy-saving hydraulic machine according to claim 1, wherein the lifting and lowering actuator comprises a wire rope and a fixed pulley, and the weighting wire rope is connected to the slider through the fixed pulley.
9. The safety and energy saving hydraulic machine according to claim 8, wherein the fixed pulley is a pulley block.
10. A safety and energy saving hydraulic machine according to claim 1, wherein the plug of the quick cylinder A pressure sensor for determining whether the weight is reasonable is provided in the cavity and the rod cavity.

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