JPS5840665B2 - reciprocating pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a springback type reciprocating pump device.

In reciprocating pumps, which perform pumping operations by sucking in and discharging fluid by reciprocating members such as plungers, diaphragms, or bellows through linear reciprocating movement,
There is a spring-back type in which a drive mechanism such as an eccentric cam applies driving force in the forward direction to the reciprocating rod, and a return spring applies biasing force in the return direction.

In this type of reciprocating pump, the movement stroke of the reciprocating iron is adjusted in order to control the fluid discharge flow rate, and for this purpose, it is equipped with an adjustment body that catches the reciprocating iron that moves in the return direction. A stroke adjustment mechanism is provided that regulates the movement of the reciprocating iron in the return direction and also changes the position of regulating the movement of the reciprocating iron in the return direction by displacing an adjusting body to increase or decrease the stroke of the reciprocating iron.

In order to automatically control the discharge flow rate, recent reciprocating pumps employ an electric servo mechanism that performs automatic control operation, that is, automatically controls the stroke adjustment mechanism.

This electric servo mechanism is equipped with a drive motor that drives and displaces the adjustment body of the stroke adjustment mechanism, and the electric motor is driven to rotate in response to a predetermined adjustment signal given from the outside, displacing the adjustment body, and further changes the amount of displacement of the adjustment body. The displacement of the adjustment body is controlled by driving the electric motor so that the amount of displacement is detected and compared with the adjustment signal, and the amount of displacement matches the adjustment signal.

However, when the stroke adjustment mechanism and the electric servo mechanism are combined, the following problems occur.

That is, in the stroke adjustment mechanism, in order to restrict the movement of the reciprocating port rad in the return direction, the adjusting body is configured to abut the reciprocating rond itself or a spring holder of a return spring attached to the reciprocating rond to receive the spring force of the return spring. When the reciprocating rod moves in the forward direction, the reciprocating rod or spring receiver separates from the adjusting body and the two are in a non-contact state, so no load is applied to the adjusting body, but when the reciprocating rod moves in the return direction, the reciprocating rod or Since the spring receiver comes into contact with the adjusting body, a load is applied to the adjusting body due to the spring force of the return spring.

For this reason, when the reciprocating iron has returned, if you try to drive the drive motor of the electric servo mechanism to displace the adjustment body, the adjustment body is loaded by the return spring and it is difficult to displace it. , a large load (resistance torque) is applied to the drive motor and the intermediate drive (rotation) transmission mechanism, making it difficult to rotate and causing a risk of damage.

Further, when the reciprocating iron returns, it is moved by the return spring and collides with the adjustment body, applying an impact force.

Therefore, in the electric servomechanism, each mechanical part such as the drive motor and drive transmission mechanism needs to be robust and large in order to have mechanical strength to withstand the load applied from the reciprocating rod side by the spring force of the return spring. In addition, it is necessary to increase the size of the drive motor in order to obtain the driving force that displaces the adjusting body of the stroke adjustment mechanism against the load on the reciprocating rond side, which also leads to an increase in the size of the electric servo mechanism and increases costs. It is expensive and uneconomical.

Furthermore, the stroke adjustment mechanism is similarly increased in size in order to increase its mechanical strength.

The present invention has been made in view of the above circumstances, and includes a transmission control mechanism that absorbs a load of a predetermined magnitude or more applied from the reciprocating rond side between the electric servo mechanism and the stroke adjustment mechanism. A springback type reciprocating pump device that displaces the adjustment body of the stroke adjustment mechanism when the load is below a predetermined load, thereby reducing the size of the electric servo mechanism and stroke adjustment mechanism, improving durability, and increasing economic efficiency. It provides:

The present invention will be explained below with reference to the drawings.

The principle structure of the reciprocating pump device of the present invention will be described with reference to FIG.

In the figure, 1 is a pump section, 2 is a reciprocating rod that operates the pump section 1, 3 is its drive mechanism, 4 is a stroke adjustment mechanism that adjusts the stroke of the reciprocating rod 2 by displacement of the adjustment body 5, and 6 is an electric servo mechanism. This electric servo mechanism 6 is provided with a drive motor 7 that provides driving force to the adjustment body 5 and a reduction gear 8 for transmitting the drive thereof, as well as a comparison controller 9, a feedback detection mechanism 10, and an operation limit detection mechanism 11.

In the figure, reference numeral 12 denotes a transmission control mechanism which is a feature of the present invention, and this transmission control mechanism is provided between the stroke adjustment mechanism 4 and the reduction gear 8 of the electric servo mechanism 6.

The reciprocating rod 2 is reciprocated by the combination of the drive mechanism 3 and the return spring, and the reciprocating rod 2 operates the pump section 1 to suck in and discharge fluid.

Adjustment of the discharge flow rate in this pump section 1, that is, the reciprocating rod 2
In order to adjust the stroke of the electric servo mechanism 6,
When a predetermined adjustment signal (for example, about 4 to 20 mA) for adjusting the discharge flow rate is given to the comparison controller 9, and the drive motor 7 is driven to rotate by the output signal from the comparison controller 9,
This driving force is transmitted to the stroke adjustment mechanism 4 via the reduction gear 8 and the transmission control mechanism 12, and the adjustment body 5 of the stroke adjustment mechanism 4 is displaced.

The stroke of the reciprocating rod 2 is adjusted according to the amount of displacement of the adjustment body 5, and as a result, the discharge flow rate of the pump section 1 is adjusted.

The amount of displacement of the transmission control mechanism 12, that is, the adjustment body 5, is detected by the feedback detection mechanism 10, and this detection signal is compared with the adjustment signal by the comparison controller 9. If there is a difference between the two, the comparison controller 9 detects the displacement amount. A signal corresponding to the difference is outputted to drive the drive motor 7 again to displace the adjustment body 5, and control is performed so that the actual displacement amount of the adjustment body 5 matches the adjustment signal.

The operation limit detection mechanism 11 detects the upper and lower limits of the stroke adjustment of the transmission control mechanism 12, that is, the adjustment body 5, and stops the rotational drive of the electric motor 1.

Here, the comparison controller 9 converts an input electric signal from the outside into another electric signal by calculation comparison and outputs it, and outputs an adjustment signal, a signal from the feedback detection mechanism 10 and a limit detection mechanism 11. Signals are input and signals are output to the drive motor 7 in accordance with these signals.

When the adjustment signal is input, the comparison controller 9 outputs a corresponding drive signal to drive the motor I, and when the detection signal from the feedback detection mechanism 10 is input, it compares it with the adjustment signal and outputs a corresponding drive signal to drive the electric motor I. A drive signal corresponding to the deviation is output to the electric motor 7, and when a signal from the limit detection mechanism 11 is input, a stop signal is output to the electric motor 7.

In this way, the stroke of the reciprocating rod 2 is varied,
The discharge flow rate of the pump section 1 can be controlled.

Further, the transmission control mechanism 12 transmits the rotational driving force from the drive motor 7 to the adjustment body 5 of the stroke adjustment mechanism 4 to displace it, but at the same time absorbs the load of the reciprocating rod 2 applied to the adjustment body 5. The structure is such that

In other words, when the load applied to the adjusting body 5 is smaller than the set value, the drive motor 7 enables the driving force to be transmitted to the adjusting body 5, and when the load is larger than the set value, it automatically cuts off the driving force transmission. It is something to control.

In this case, the magnitude of the set value is set so that the drive motor 7 and reduction gear 8 are not overloaded.

Therefore, the driving force is transmitted from the first drive motor 7 to the adjustment body 5 at a constant value or lower than the set value, regardless of changes in the load on the reciprocating iron side, and when a load above a certain value is applied to the adjustment body 5. In this case, since the driving force transmission is cut off, the drive motor 7 and the reduction gear 8 can be protected from being subjected to an overload (high resistance torque) exceeding a certain value.

In this way, the load on the reciprocating rod side is automatically controlled.

Therefore, in the reciprocating pump device of the present invention, the pump section 1 performs a reciprocating pump operation using a diaphragm, a bellows, a plunger, etc., and the reciprocating rod 2
1 is moved in the forward direction by a drive device 3 and biased in the return direction by a return spring 1. The drive mechanism 3 is a device that reciprocates and drives the reciprocating rod 2, and can be a piston type crank type, a solenoid type, or an eccentric cam type. There are various types, but the eccentric cam type is the most suitable.

The stroke adjustment mechanism 4 regulates (stops) the movement of the reciprocating rod 2 in the return direction using an adjustment body 5, and variably adjusts the stroke of the reciprocation rod 2 by displacing the adjustment body 5. ) are not specified, but include, for example, those using a stopper rod, those using a swash plate cam, and those using an eccentric cam.

The adjusting body 5 directly or indirectly contacts the reciprocating rod 2 to receive the spring force of the return spring, and the displacement method for displacing the adjusting body 5 is a screw type depending on the configuration of the stroke adjusting mechanism 4. There are rotational linear movement, rotation by cam type, and movement along the finishing line.

The electric servo mechanism 6 includes a drive motor 1 that provides a driving force to displace the adjustment body 5, and the drive motor 7 is activated in response to an adjustment signal.
Any servo control that drives the adjustment body 5 and feeds back the amount of displacement of the adjustment body 5 may be used.

Further, the transmission control mechanism 12 transmits the driving force from the drive motor 7 to the adjustment body 5 when the load on the reciprocating iron side is smaller than the set value, and when the load is larger than the set value, it absorbs this and drives. Any configuration is sufficient as long as the transmission can be blocked.

It is desirable that the set value can be variably manipulated.

For example, a torque limiter that uses friction force, spring force, etc.
These include friction joints, etc.), torque joints that use magnetic force, and intermediate transmission medium mechanisms that use friction force (friction wheels, etc.).

Alternatively, it may be possible to electrically detect the torque of the adjusting body and send the signal to a comparison controller to control the motor.

Next, an embodiment of the reciprocating pump device of the present invention will be described with reference to FIG.

In the figure, reference numeral 21 denotes a mechanism part case, and inside thereof there is an eccentric cam 23 fitted to the drive shaft 22 of the drive mechanism 3, and a reciprocating rod whose one end abuts on the eccentric cam 23 and is converted into reciprocating linear motion. The reciprocating rod 24 is inserted horizontally into a support hole 25 formed in the case 21 and a support hole 27 formed in a bracket 26 attached to the case 21 so as to be movable in the axial direction.

Further, the pump head 28 combined with the bracket 26 is provided with a suction port 30 having a check valve 29 and a discharge port 32 having a check valve 31, and inside the pump head 28, the other end of the reciprocating rod 24 is provided. The diaphragm 33 and the retainer 34 are fitted and held by a diaphragm holder 35, and the outer circumference of the diaphragm 33 is held by a bracket 2.
6 and the pump head 28 to form a pump chamber 36.

In this way, the pump section 37 is configured.

In addition, a swash plate cam 38 is fixed at the intermediate portion of the reciprocating rod 24 provided inside the mechanism case 21 with a ring 39 so as not to move in the axial direction. The reciprocating rod 24 is formed with a tapered slope whose diameter increases from the return direction (rightward direction) toward the outward direction (leftward direction).

The swash plate cam 38 is reciprocated together with the reciprocating rod 24.

A return spring 40 made of a compression coil spring is stretched between the swash plate cam 38 and the bracket 26, and this return spring 40 applies a biasing force to the reciprocating rod 24 in the return direction. .

An adjustment shaft 41 serving as an adjustment body is vertically screwed into the case 21 above the swash plate cam 38. The lower end of the adjustment shaft 41 is in contact with the slope of the swash plate cam 38, and is inserted into a stroke scale cylinder 42 provided in the case 21, and an adjustment dial 43 is fitted therein.

In this way, the stroke adjustment mechanism 44 is configured.

Further, a 1-drive electric motor 46 and a reduction gear 47 connected thereto are provided at the bottom of a control box 45 provided at the top of the mechanism case 21, and a feedback detection mechanism is provided at the top of the box 45 covered with a cover 48. A feedback resistor 49, a limit cam 50, 50' operated by the rotating shaft 49a of the feedback resistor 49 as an operation limit detection mechanism, and a limit switch 51.
．． 51', a motor capacitor 52, and a support plate 53 are provided.

Note that the comparison controller 9 (not shown) is provided separately.

In this way, the electric servo mechanism 54 is configured.

Furthermore, a transmission control mechanism 67 equipped with a friction torque limiter 68 is provided inside the control box 45 .

That is, the core shaft 5 fitted to the output shaft 47a of the reducer 47
A transmission gear 56 is loosely fitted into the transmission gear 56, and friction contact plates 57.57 made of rubber, leather, etc. are superimposed on the upper and lower sides of the transmission gear 56. A disc spring 58, which is pressed and clamped from above and below at the end of the shaft 55 and provides contact pressure between the transmission gear 56 and the friction contact plates 57, 57, is held under pressure by a nut 59 screwed onto the core shaft 55.

Therefore, a friction torque limiter 68 is configured, and the transmission gear 56 is held by the core shaft 55 and rotates integrally with the core shaft 55.

The adjustment shaft 41 is located adjacent to the reducer 47 in the box 45.
A control shaft 61 supported by a bearing 60 is provided at a location located on the L side, and a transmission gear 62 that meshes with the transmission gear 56 is fitted into the upper part of the control shaft 61.

A connecting shaft 64 is connected to the lower part of the control shaft 61 via a sliding key 63, and this connecting shaft 64 is inserted into the adjustment dial 43 and connected to the adjusting shaft 41.

Note that the control shaft 61 is connected to transmission gears 65 and 66.
The rotation is transmitted to the rotating shaft 49a of the feedback resistor 49 via the rotary shaft 49a of the feedback resistor 49.

However, 1. Eccentric cam 23 that rotates together with the drive shaft 22
The reciprocating rod 24 moves in the forward direction and also in the backward direction.
By moving the reciprocating rod 24 in the return direction by the spring force of the Jg spring 40, the diaphragm 33 is reciprocated, and this movement sucks fluid into the pump chamber 36 from the suction port 30, pressurizes it, and discharges it from the discharge port 32. .

When adjusting the discharge flow rate in the pump section 1, that is, adjusting the stroke of the reciprocating rod 24, when the 1-drive electric motor 46 is driven to rotate in response to a signal from the comparison controller 9, the speed is reduced by the reducer 47, and the output shaft 47a is rotated. The rotation is transmitted from the torque limiter 68 to the core shaft 55, and further to the core shaft 5.
When the transmission gear 56 rotates integrally with the rotation of the transmission gear 5, the control shaft 61 rotates via the transmission gear 62.

The rotation of the control shaft 61 rotates the connection shaft 64, and the rotation is transmitted to the adjustment shaft 41 via the adjustment dial 43, so the adjustment shaft 41 moves downward one step while rotating.

In this case, the vertical movement of the adjustment @41 is absorbed by the vertical movement of the connecting shaft 64 via the sliding key 63, and rotation transmission from the control shaft 61 is possible.

Here, when the reciprocating rod 24 is moved in the return direction by the return spring 40, the swash plate cam 38 is also pushed by the return spring 40 and moves in the return direction, and the slope abuts the lower end of the adjustment shaft 41. .

When the adjustment shaft 41 moves up and down and its lower end also displaces in the vertical direction, the contact position between the lower end of the adjustment shaft 41 and the slope of the swash plate cam 38 changes, so the swash plate cam 38 is guided by the slope and the reciprocating rod The reciprocating rod 2 moves along the axial direction of 24.
4 are integrally moved in the axial direction to adjust their strokes.

In this case, the stroke adjustment amount of the reciprocating rod 24 is determined in proportion to the upward or downward movement amount of the adjustment shaft 41.

In this way, for example, as shown in FIG.
When the reciprocating rod 24 is lowered, the reciprocating rod 24 is moved in the forward direction, the stroke is shortened, and the discharge flow rate from the pump section 37 is reduced.

Here, the torque limiter 68 in the transmission control mechanism 67
Now, adjust the spring force of the disc spring 58 by operating the nut 59 in advance to set the pressing holding force (load force) on the transmission gear 56 at the friction contact plate 57.57 to a predetermined value. put.

If the load (resistance torque) on the reciprocating rod 24 side applied to the adjustment shaft 41, that is, the control shaft 61, is smaller than the pressing holding force set by the torque limiter 68 (
When adjusting the stroke of the reciprocating rod 24 when the swash plate cam 38 is away from the adjustment shaft 41 when the reciprocating rod 24 moves in the forward direction, the torque limiter 68 overcomes the load and the transmission gear 56 rotates integrally. Therefore, the rotational driving force of the drive motor 46 is transmitted to the control shaft 61.

However, if the load (resistance torque) applied from the reciprocating rod 24 side to the adjustment shaft, that is, the control shaft 61, is larger than the pressing holding force set by the torque limiter 68 (the reciprocating rod 24 is pushed by the return spring 40 and moves in the return direction) (When adjusting the stroke while the swash plate cam 38 is in contact with the adjustment shaft 41), the adjustment shaft 41° shaft 61 and the transmission gear 62 do not rotate, so the torque limiter 68 Even when the transmission gear 56 rotates, the transmission gear 56 slides on the friction contact plates 57, 57 and does not rotate integrally with the output shaft 47a and the core shaft 55.

Therefore, no rotation is transmitted from the torque limiter 68 to the control shaft 61.

As a result, the driving force for one rotation from the drive motor 46 is not transmitted to the adjustment shaft 41 and the adjustment shaft 41 does not move, so the load on the reciprocating rod 24 side is not applied to the drive motor 46 and reducer 47, resulting in overload. You can prevent it from happening.

Therefore, regardless of the load condition on the reciprocating rod 24 side, the drive motor 46 always transmits one driving force below a certain load value set by the torque limiter 68, and can prevent further overload from being applied.

Note that the rotation of the control shaft 61 is controlled by the transmission gear 65.
．． 66 to the feedback resistor 49, and via the cam 50.50' to the limit switch 51.5
1' is operated to detect the upper and lower limits of movement of the adjustment shaft 41, and a signal is sent to the comparison controller 9, and the drive of the drive motor 46 is stopped in response to a signal from the comparison controller 9.

The swash plate cam 38 has a tapered slope with an angle θ, and by replacing a plurality of swash plate cams each having a different slope and attaching them to the reciprocating rod 24, the swash plate cam 38 can be screwed into the case 21. Even if the amount of movement of a certain adjustment shaft 41 is constant, the amount of stroke of the reciprocating rod 24 can be varied.

For this reason, for pump models with various pump specifications,
It is possible to share the electric servo mechanism connected to the stroke adjustment mechanism.

Therefore, FIGS. 4 and 5 show other actual cases in which the stroke adjustment mechanisms are different, and the same parts as in FIG. 2 are given the same reference numerals and the explanation will be omitted.

Fig. 4 uses a control rod type stroke adjustment mechanism, and an adjustment rod (control rod) 70 as an adjustment body is screwed into a screw hole 71 of the mechanism case 21, and one end thereof is connected to the transmission control mechanism. is directly connected to the control shaft 61 of the reciprocating rod 24 via a sliding key 63, and the other end comes into contact with a spring receiving plate 72 for the return spring 40 attached to the reciprocating rod 24 to prevent the reciprocating rod 24 from moving in the return direction. It is now regulated.

Then, when the control shaft 61 rotates the adjustment rod 70 by the rotational drive of the drive motor 46, the adjustment rod 70
rotates in the axial direction and moves the reciprocating rod 24 in the axial direction via the spring receiving plate 72 to adjust the stroke.

Fig. 5 uses an eccentric cam type stroke adjustment mechanism, and in the figure, 73 is a worm gear consisting of a worm and a worm wheel, which is (a part of) the drive mechanism, and 74 is a worm gear provided in the mechanism case 21. 73 is a drive shaft that is rotationally driven; 75 is an eccentric cam attached to the drive shaft 74; 76 is a reciprocating rod that is provided in the mechanism case 21 and has one end in contact with the eccentric cam 75; 77 is a mechanism case 21
The camshaft 80 is a spring receiving plate, which is an adjusting body supported by a bearing plate 79 provided in the camshaft and having an eccentric cam 78 that abuts one end of the reciprocating door 6 to restrict its movement in the return direction.

Note that the dowel drive gear 8 is provided on the camshaft 17, and the transmission gear 81 that meshes with the transmission gear 56 is attached to the output shaft 47a of the reduction gear 47.

When the drive electric motor 46 is driven to rotate, the rotation is transmitted from the output shaft 47a to the camshaft 7 via the transmission gears 81.56.
7, the eccentric cam 78 rotates by a predetermined angle integrally with the cam shaft 77, and the reciprocating door 6 moves in the axial direction.

In this case, the stroke adjustment amount is defined according to the rotation angle of the eccentric cam 78.

6 and 7 respectively show other actual examples of the transmission control mechanism.

Figure 6 shows a torque joint that uses magnetic force.
The mechanism case 82 is provided with a transmission shaft 83 coaxial with the output shaft 47a of the reducer 47 and supported by a bearing 84.
Rotating disks 85 and 86 are attached to the output shaft 47a and the transmission shaft 83, respectively, so as to face each other apart from each other.

These rotating disks 85, 86 are provided with a plurality of permanent magnets 87, 8, having different polarities so as to exert magnetic attraction forces on each other.
8. Attach...

Note that transmission gears 90 and 91 that mesh with each other are attached to the transmission shaft 83 and the control shaft 89, respectively.

When the drive electric motor 46 is driven to rotate, one rotary disk 85 and the permanent magnets 8γ attached thereto rotate integrally with the output shaft 47a of the reducer 47, and the permanent magnets 87 and the other rotate. The other rotating disk 86 is rotated together with the magnetic attraction force between the permanent magnets 88 attached to the rotating disk 86.

The rotation of the rotating disk 86 is transmitted from the transmission shaft 83 to the transmission gear 90.9.
1 to the control shaft 89, and the rotation of the control shaft 89 displaces an adjustment body of a stroke adjustment mechanism (not shown), thereby performing reciprocating stroke adjustment.

Here, each permanent magnet 87 of the rotating disk 85, 86...
88... If the side load of the reciprocating iron is small relative to the magnetic attraction between If the load on the rond side is large, even if one rotary disk 85 is rotated by the electric motor 46, the other rotary disk 86 cannot be rotated, and rotational transmission between the two is interrupted, so stroke adjustment is not performed.

FIG. 7 shows a torque joint using a friction wheel, in which friction wheels 92 and 93 each having a truncated cone shape are attached to the output shaft 47a of the reducer 47 and the transmission shaft 83, and these friction wheels 92 , 93, an intermediate friction wheel 94 is connected to the mechanism case 82.
The friction wheel 94 is supported by a bearing 95 provided in the mechanism part case 82, and the friction wheel 94 is supported by a compression type coil spring 96 provided in the mechanism case 82.
Press them into contact with each other.

In this takeover, when the friction wheel 92 is rotated by the drive electric motor 46, the intermediate friction wheel 94 rotates while being in contact with it, and the rotation of the friction wheel 94 causes the friction wheel 93 to rotate.

The rotation of the friction wheel 93 is transmitted to the control shaft 89 via the transmission shaft 83 and transmission gears 90 and 91, and the control shaft 89 displaces the adjusting body.

When the load on the reciprocating iron side is smaller than the friction force between the intermediate friction wheels 94 and 92,93, each friction wheel 9
2, 94, and 93 rotate together and rotation transmission is performed, but if the load is large, the friction wheel 93 stops and rotation transmission is not performed.

In this way, the transmission control mechanism shown in FIGS. 6 and 7 is
The stroke adjustment is performed by transmitting the rotational driving force to the stroke adjustment mechanism under a predetermined load, similar to the one using the friction torque mechanism shown in FIG.

As explained above, the reciprocating pump device of the present invention is equipped with a stroke adjustment mechanism that adjusts the discharge flow rate, that is, stroke adjustment, for a springback type reciprocating pump, and an electric servo mechanism that drives and controls the stroke adjustment mechanism. Since a transmission control mechanism is provided between the stroke adjustment mechanism and the electric servo mechanism to cut off or enable rotation transmission depending on the magnitude of the reciprocating rod side load applied to the stroke adjustment mechanism, the electric servo mechanism The electric servo mechanism prevents overload from being applied to the stroke adjustment mechanism and displaces the adjustment body of the stroke adjustment mechanism using the driving force of the electric motor of the electric servo mechanism under a constant load. It is possible to reduce the size and improve durability, and also to reduce the size of the stroke adjustment mechanism, thereby reducing costs and improving economic efficiency.

[Brief explanation of drawings]

FIG. 1 is a basic configuration diagram showing a reciprocating pump device according to the present invention, and FIG. 2 is a sectional view showing an embodiment of the device according to the present invention.
FIG. 3 is an explanatory diagram showing the stroke adjustment operation, FIGS. 4 and 5 are cross-sectional views showing actual cases of the stroke adjustment mechanism, and FIGS. 6 and 7 each show other actual examples of the transmission control mechanism. FIG. 1...Pump part, 2...Reciprocating rod,
3... Drive mechanism, 4... Stroke adjustment mechanism, 5... Adjustment body, 6... Electric servo mechanism, 7... Drive Electric motor, 21...
・Mechanism part case, 22... Drive shaft, 24...
... Reciprocating rod, 28 ... Pump head, 3
3...Diaphragm, 37...Pump section, 38...Swash plate cam, 40...Return spring, 41...Adjustment shaft , 44... Stroke adjustment mechanism, 46... Drive motor, 41...
...Reducer, 61...Control shaft, 67...Transmission control mechanism, 68...
・Torque limiter, 70... Adjustment rod, 74...
...Drive shaft, 77...Camshaft, 78...
... Eccentric cam, 85.86 ... Rotating disk, 8
7.88...Permanent magnet, 92,93.94...
...Friction wheel.

Claims (1)

[Claims] 1. In a reciprocating pump that is equipped with a reciprocating iron that causes the pump part to perform a pumping operation by linear reciprocating movement, a drive mechanism applies a driving force in the forward direction to the reciprocating iron, and a return spring applies a biasing force in the return direction. , an adjustment body for regulating the movement of the reciprocating rod in the return direction, and a stroke adjustment of the reciprocating rod is performed by changing a position where movement of the reciprocating rod in the return direction is restricted by displacement of the adjustment body; - an adjustment drive motor that provides a driving force for causing the adjustment body to perform a displacement operation in accordance with a discharge flow rate adjustment signal; and an adjustment drive motor that transmits the driving force from the drive motor to the adjustment body; is provided between the drive motor and the adjustment body and enables the driving force to be transmitted from the drive motor to the adjustment body when the load of the reciprocating iron applied to the adjustment body is smaller than a set value. A reciprocating pump device comprising a transmission control mechanism that cuts off transmission of driving force when the load of the reciprocating iron is greater than a set value.