JP2015221704A - Garbage collection vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a garbage collection vehicle with good producibility where piping layout is not varied from standard articles as much as possible in the addition of constituents for strong compression control.SOLUTION: A strong compression unit 50 descending hydraulic oil pressure in the back pressure side oil chamber of a discharge cylinder 33 when pressure acting a loading device 10 at the loading operation of garbage by the loading device 10 reaches a predetermined value or higher is disposed in the hydraulic circuit 30 of a garbage collection vehicle. The strong compression unit 50 attached to a hydraulic valve unit 40 includes: a bypass passage 51a; and an upstream side solenoid check valve 52 and a downstream side relief valve 53 disposed on the bypass passage 51a. The upstream side solenoid check valve 52 and the downstream side relief valve 53 are connected to the hydraulic circuit in series.

Description

The present invention relates to a garbage collection vehicle, and more particularly to a garbage collection vehicle having a strong compression control function for efficiently loading bulky garbage such as cardboard.

Conventionally, a garbage collection vehicle is mounted on a chassis and has a dust storage box having an opening at the rear end, and a dust thrower connected to the rear end of the dust storage box so that the opening can be opened and closed. A box and a loading device for loading the dust thrown into the dust throwing box into the dust storage box side are provided. In addition, some conventional garbage collection vehicles include a discharge plate that is provided to be movable back and forth so as to change the volume of the dust storage space in the dust storage box. This discharge plate is moved back and forth by a discharge cylinder.

The discharge plate has a function of discharging the dust loaded in the dust storage box during the dust discharge operation from the opening of the dust storage box. The discharge plate also has a function of increasing the compression of the dust during the loading operation of the dust. Specifically, during the loading operation, the back pressure side oil chamber of the discharge cylinder is maintained at a high pressure, and when the pressure acting on the discharge cylinder becomes higher than the set pressure for loading as the dust is loaded, the relief valve temporarily The hydraulic oil is opened to escape into the oil reservoir, and the discharge plate is automatically moved gradually to the back side (forward) of the dust container box in response to the loading of the dust. Thereby, the dust can be accommodated in the dust accommodating space while being compressed. This is the operation of the standard waste collection vehicle discharge plate.

However, if the dust is bulky, such as corrugated cardboard, the force applied to the discharge cylinder exceeds the set pressure for loading even though it is not sufficiently compressed during loading, and the discharge plate automatically Sometimes moved forward. Therefore, the standard garbage truck has a problem that cardboard or the like cannot be efficiently accommodated in the dust accommodating space.
In view of this, a dust collection vehicle having a strong compression control function for efficiently accommodating cardboard or the like in a dust storage box has been considered (for example, see Patent Document 1).

In Patent Document 1, a solenoid valve having a communication position where a back pressure side oil chamber of a discharge cylinder communicates with the oil reservoir via a throttle portion, and a loading device at the time of loading dust with the loading device are disclosed. There is disclosed switching control means for controlling the solenoid valve to be positioned at the communication position only instantaneously when the acting pressure reaches a predetermined value or more.
More specifically, the switching control means has a high-pressure side circuit and a low-pressure side circuit that branch from an intake / exhaust flow path that connects a discharge cylinder valve that switches expansion and contraction of the discharge cylinder and a cylinder port of the discharge cylinder. The high-pressure side circuit and the low-pressure side circuit are parallel to each other, and the high-pressure side circuit and the low-pressure side circuit are connected to the oil reservoir via a throttle portion and a solenoid valve, respectively. The high pressure side circuit is provided with a relief valve for loading on the downstream side of the solenoid valve, and the solenoid valve of the low pressure side circuit is a solenoid check valve with a check function (check function).

The switching control means of Patent Document 1 is used when loading a dust card that is difficult to compress, such as corrugated cardboard, when the back pressure side oil chamber of the discharge cylinder becomes higher than a predetermined value by closing the high pressure side circuit with a changeover switch. Strong compression control is performed so that the solenoid valve is positioned at the communication position only momentarily. Also, when loading garbage that is easy to compress, such as garbage, normal compression control is performed in which the low pressure side circuit is closed by a switch to automatically move the discharge plate forward according to the compression state of garbage such as garbage. To do.

Japanese Utility Model Publication No. 5-85707

Conventionally, a garbage collection vehicle having a strong compression control function as in Patent Document 1 has been treated as an optional product. When an order is received, the above-described high-pressure side circuit and low-pressure side circuit are incorporated into a standard hydraulic circuit. It will be.
However, since the high voltage side circuit and low voltage side circuit of the optional product have been incorporated in the past considering the standard product as a standard, it has been necessary to greatly change the piping layout from the standard specification. Specifically, in the conventional optional product, a pipe provided with a throttle part and a solenoid valve for a high-pressure circuit and a pipe provided with a throttle part and a solenoid check valve for a low-pressure circuit were added to the standard product. In addition, the solenoid valve of the high-pressure side circuit and the solenoid check valve of the low-pressure side circuit are attached at separate locations. For this reason, the conventional optional product has a complicated piping layout and a larger number of parts than the standard product, and requires a large number of mounting steps.

The present invention has been made in view of the above points, and the object of the present invention is to add a configuration for strong compression control when manufacturing a garbage collection vehicle having a strong compression control function as an optional product. An object of the present invention is to provide a garbage collection vehicle having a high production efficiency so as to be able to be performed without changing the piping layout as much as possible from a standard product.

In order to achieve the above object, in the present invention, a configuration for strong compression control is attached to the hydraulic valve unit.

Specifically, in the first invention, a dust storage box mounted on a chassis and having an opening, and a dust input box connected to the dust storage box so that the opening can be opened and closed. A loading device for loading the dust thrown into the dust bin into the dust bin, and the dust bin that is movably provided to change the volume of the dust bin in the dust bin A discharge plate for discharging the dust loaded inside from the opening, a discharge cylinder for moving the discharge plate, and a hydraulic circuit for hydraulically driving the loading device and the discharge cylinder; In the refuse collection vehicle provided with the hydraulic circuit and a multiple hydraulic valve unit that controls an operation direction of the loading device and the discharge cylinder, the hydraulic circuit is loaded with dust by the loading device. At work A strong compression unit is provided for lowering the hydraulic pressure in the back pressure side oil chamber of the discharge cylinder when the pressure acting on the loading device reaches a predetermined value or more, and the strong compression unit is attached to the hydraulic valve unit. It is characterized by that.

  According to the above configuration, since the strong compression unit is attached to the hydraulic valve unit, the change in the piping layout can be reduced when the specification is changed from the standard product to the optional product having the strong compression control function. As a result, only a small modification of the standard product is required, and a garbage collection vehicle with high manufacturing efficiency can be obtained. In addition, since the hydraulic functional parts are arranged in a concentrated manner, it is possible to reduce the number of mounting steps of the hydraulic functional parts and improve the maintainability.

According to a second aspect, in the first aspect, the hydraulic valve unit includes a discharge cylinder valve that switches expansion and contraction of the discharge cylinder, and the strong compression unit includes the valve port of the discharge cylinder valve and the discharge port. A bypass flow path that branches from the intake / exhaust flow path connecting the cylinder port of the cylinder and communicates with the oil reservoir, an upstream solenoid check valve provided on the bypass flow path, and a downstream relief valve; The solenoid check valve and the relief valve are connected in series in a hydraulic circuit.

  According to the above configuration, the conventional compression control is switched between the strong compression control and the normal compression control by the two circuits of the high pressure side circuit provided with the solenoid valve and the relief valve and the low pressure side circuit provided with the solenoid check valve. Compared with a garbage truck, it is possible to perform switching control between strong compression control and normal compression control with a simpler configuration. As a result, since the number of hydraulic functional parts is reduced, it is possible to change the specification of an optional product with a strong compression control function from a standard product with a smaller modification than before. As a result, it is possible to obtain a garbage collection vehicle with high manufacturing efficiency.

In a third invention, in the second invention, the bypass flow path is provided in a metal block body, and the solenoid check valve and the relief valve are attached to the metal block body.

According to the above configuration, if a component in which the solenoid check valve and the relief valve are integrally attached to the metal block body is prepared, the component can be easily attached to the hydraulic valve unit. Thereby, it can be set as a garbage collection vehicle with more manufacturing efficiency. Further, if only the relief valve is attached to the metal block body and a plug for closing the solenoid check valve attachment portion is attached, the metal block body can be easily changed to a standard product while being attached to the hydraulic valve unit. In this way, the two specifications of the standard product and the optional product can be handled without substantially changing the piping layout. That is, the specification can be easily changed by considering the piping layout of the optional product as a reference.

In a fourth invention, in the third invention, an insertion hole is formed in the metal block body, and a cylindrical connecting member that forms a part of the intake / exhaust flow path is inserted in the insertion hole, The distal end portion of the connecting member is connected to the valve port of the discharge cylinder valve, and the discharge cylinder valve and the metal block body are connected.

  According to the above configuration, when the metal block body in which the solenoid check valve and the relief valve are integrally attached is attached to the hydraulic valve unit, the center of the insertion hole of the metal block body and the center of the valve port of the discharge cylinder valve After that, the operation of inserting the connecting member through the insertion hole and the operation of attaching the tip of the connecting member to the valve port can be continuously performed. As a result, the connection work between the metal block and the discharge cylinder valve is facilitated, and a garbage collection vehicle with higher production efficiency can be obtained.

In the fifth invention, in the fourth invention,
The circular wall around the axial center of the connecting member is provided with a small hole as a throttle portion disposed upstream of the solenoid check valve and the relief valve on the bypass flow path.

According to said structure, a throttle part can be easily provided on a bypass flow path, and the attachment can also be performed simultaneously with making a cylindrical member penetrate the insertion hole of a metal block body. Thereby, it can be set as a garbage collection vehicle with more manufacturing efficiency.

  As described above, according to the present invention, since the strong compression unit is attached to the hydraulic valve unit, when the specification is changed from the standard product to the option product having the strong compression control function, a small modification is required, and the manufacturing efficiency is improved. Can be a good garbage truck. In addition, since the hydraulic functional parts are arranged in a concentrated manner, it is possible to reduce the number of mounting steps of the hydraulic functional parts and improve the maintainability.

It is a side view which shows the refuse storage box and the dust input box of the refuse collection vehicle which concerns on embodiment of this invention. 1 is a hydraulic circuit diagram of a garbage truck according to an embodiment of the present invention. It is a perspective view which shows the hydraulic valve unit and strong compression unit of the garbage truck which concerns on embodiment of this invention. It is sectional drawing which shows a strong compression unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the garbage truck according to the present embodiment is mounted on a chassis and has a dust container 2 having an opening 2a at the rear end, and a dust container so that the opening 2a can be opened and closed. A dust input box 3 connected to the box 2 is provided. The dust input box 3 is tiltable with respect to the dust storage box 2 around the pivot shaft 4 at the upper end, and a rectangular dust input port 3a is provided at the lower rear surface.
Inside the dust container 2 is provided to be movable back and forth so as to change the volume of the dust container space in the dust container 2, and the dust loaded in the dust container 2 is discharged from the opening 2a to the outside. And a discharge cylinder 33 for moving the discharge plate 20 back and forth.
In addition, a loading device 10 for loading the dust thrown into the dust throwing box 3 from the dust throwing port 3a into the dust containing box 2 is provided inside the dust throwing box 3.

The loading device 10 includes a rotating plate 12 for scraping the thrown-in dust to the dust container 2 side, and a pushing plate 11 for pushing the dust picked up by the rotating plate 12 into the dust container box 2. . As shown in FIGS. 1 and 2, the rotating plate 12 is driven by a hydraulic motor 32, and the pushing plate 11 is driven by a pushing cylinder 31.
In this embodiment, the hydraulic motor 32 and the pushing cylinder 31 of the loading device 10, the discharge cylinder 33, the opening / closing cylinder (not shown) that tilts the dust container box 3 with respect to the dust container box 2, and the dust container box A hydraulic circuit 30 is provided for hydraulically driving a lock cylinder 34 that locks 3 to the dust container 2.

The hydraulic circuit 30 includes an oil reservoir 36, a hydraulic pump 35, a multiple hydraulic valve unit 40 that controls the operation direction of the pushing cylinder 31, the hydraulic motor 32, and the discharge cylinder 33, and a discharge relief valve 37. It has been.
The hydraulic pump 35 is driven by a driving force extracted from a vehicle travel engine and transmission (not shown) via a power take-off device (not shown).
The hydraulic pump 35 supplies the hydraulic oil in the oil reservoir 36 to the hydraulic valve unit 40 through the main supply channel 38. Further, the hydraulic oil from the hydraulic valve unit 40 is returned to the oil reservoir 36 through the main return channel 39.

As shown in FIGS. 1 to 3, the hydraulic valve unit 40 is attached to the upper portion of the front wall portion 2 b of the dust container box 2. From the hydraulic valve unit 40, metal pipes such as a rod side intake / exhaust flow path 311 and a bottom side intake / exhaust flow path 312 described later extend. These metal pipes are adapted to supply hydraulic oil to the dust container 3 while being supported by mounting brackets 2d provided at predetermined intervals on the front wall 2b and the ceiling wall 2c of the dust container 2. .
The hydraulic valve unit 40 has a base portion 45, and a discharge cylinder valve 43, a push-in cylinder valve 41, a hydraulic motor valve 42, and a lock cylinder valve 44 are attached to the base portion 45 side by side. Each of the discharge cylinder valve 43, the push cylinder valve 41, the hydraulic motor valve 42, and the lock cylinder valve 44 is a 6-port 3-position solenoid valve.

The lock cylinder valve 44 is connected to the lock cylinder 34 by a rod side intake / exhaust passage 341 and a bottom side intake / exhaust passage 342. The hydraulic motor valve 42 is connected to the hydraulic motor 32 by a first intake / exhaust flow path 321 and a second intake / exhaust flow path 322.
The pushing cylinder valve 41 is connected to the pushing cylinder 31 by a rod side intake / exhaust flow path 311 and a bottom side intake / exhaust flow path 312.
A pressure switch 61 is connected to the bottom side intake / exhaust flow path 312 near the pushing cylinder valve 41. This pressure switch 61 detects that the pressure acting on the pushing plate 11 has reached a predetermined value or more during the loading operation of the dust by the loading device 10 through the pressure applied to the back pressure side oil chamber of the pushing cylinder 31. A signal is sent to the omitted control unit.
Further, the discharge cylinder valve 43 is connected to the discharge cylinder 33 by a rod side intake / exhaust passage 331 and a bottom side intake / exhaust passage 332. By switching the spool position of the discharge cylinder valve 43, the expansion / contraction operation or neutral of the discharge cylinder 33 is switched.

Here, as a characteristic part of the present invention, the above-described hydraulic circuit 30 includes a discharge cylinder 33 when the pressure acting on the loading device 10 reaches a predetermined value or more during the loading operation of the dust by the loading device 10. A strong compression unit 50 is provided for lowering the hydraulic pressure in the back pressure side oil chamber.
The strong compression unit 50 is attached to the hydraulic valve unit 40.

Specifically, the strong compression unit 50 includes a bypass flow path that branches from a bottom-side intake / exhaust passage 332 that connects the valve port 43 a of the discharge cylinder valve 43 and the cylinder port 33 a of the discharge cylinder 33 and communicates with the oil reservoir 36. 51a, and an upstream solenoid check valve 52 and a downstream relief valve 53 provided on the bypass passage 51a. The solenoid check valve 52 and the relief valve 53 are connected in series in a hydraulic circuit.
Further, as shown in FIGS. 3 and 4, the strong compression unit 50 includes a metal block body 51 having a rectangular parallelepiped shape, and a solenoid check valve 52 and a relief valve 53 are attached to the metal block body 51. It is like that.

Further, a plurality of holes are formed in the metal block body 51 so that a bypass channel 51a is formed therein. The bypass channel 51 a is provided so that most of the bypass channel 51 a extends in the longitudinal direction of the metal block body 51. The bypass flow path 51a is formed by using a drill, but an unnecessary opening is closed with a male screw part 54d in order to form an intended flow path inside.
Further, the metal block body 51 is formed with an insertion hole 51b communicating with the bypass channel 51a. The insertion hole 51b is provided so as to extend in the short direction of the metal block body 51, and a connection portion 51d serving as an end portion of the bypass channel 51a is opened in a part of the wall surface forming the insertion hole 51b. . In the connection part 51d, the axial center direction of the insertion hole 51b and the axial center direction of the bypass flow path 51a are substantially orthogonal.

The solenoid check valve 52 is attached to the short-side end surface 51e of the metal block body 51, and is connected to the bypass flow path 51a at an end portion 52a that enters the metal block body 51.
The solenoid check valve 52 is connected to the control unit so that the operation is different when either the normal mode or the strong compression mode is selected by the changeover switch 62 (see FIG. 1) provided on the side surface of the dust box 3. Are controlled. In the normal mode, the solenoid check valve 52 is controlled to always open the check function. Further, in the case of the strong compression mode, the solenoid check valve 52 sets a state in which a check function for stopping the movement of the hydraulic oil entering the bypass passage 51a from the bottom side intake / exhaust passage 332 to the downstream side is in an initial state. When the pressure switch 61 detects that the pressure applied to the back pressure side oil chamber of the push-in cylinder 31 has reached a predetermined value or more, the solenoid check valve 52 instantaneously applies the working oil in the back pressure side oil chamber of the discharge cylinder 33. Only the oil reservoir 36 is controlled to escape.

Next, a middle portion of the bypass flow path 51a that connects between the solenoid check valve 52 and the insertion hole 51b is connected to a pressure meter port 51c provided in the depth direction of the metal block body 51. A pressure meter line 512 extends from the meter port 51c. The outer end of the pressure meter line 512 is a pressure meter connecting portion 513. By connecting a pressure meter (not shown) to the pressure meter connecting portion 513, the relief valve 53 is set while looking at the value of the pressure meter. Adjustment of pressure etc. can be performed.
The relief valve 53 is attached to the longitudinal end surface 51 f of the metal block body 51, and is connected to the bypass flow path 51 a at an end portion 53 a that enters the metal block body 51. The relief valve 53 is connected to the downstream side of the solenoid check valve 52 by the bypass passage 51a. The end 53 a of the relief valve 53 is also connected to an elbow member 511 a that is attached to the short-side end surface 51 e of the metal block body 51 and forms a part of the bypass return flow path 511. The bypass return channel 511 is connected to the main return channel 39 (see FIG. 2).

Next, in the present embodiment, the metal block body 51 and the discharge cylinder valve 43 are connected by a cylindrical connecting member 54.
Specifically, the connecting member 54 includes a hexagonal cylindrical exposed portion 54a, a cylindrical insertion portion 54b that is continuous in the axial direction of the exposed portion 54a and has a smaller outer diameter than the exposed portion 54a, and a connecting member. And a male threaded portion 54d located at the tip of 54.
The exposed portion 54a is a portion that can be gripped with a tool, and a female screw portion 54g is formed at the center portion.
Further, a circumferential groove 54c is formed in a part of the circular wall around the axis of the insertion part 54b. In the bottom wall of the circumferential groove portion 54c, a small hole 54e is provided as a throttle portion that communicates with the inner hole 54f of the insertion portion 54b.

The connecting member 54 having the above-described shape is inserted into the insertion hole 51 b of the metal block body 51 to form a part of the bottom side intake / exhaust passage 332. In a state where the connecting member 54 is inserted into the insertion hole 51b, the circumferential groove portion 54c is opposed to the connection portion 51d of the bypass channel 51a. With this configuration, a branch flow path is formed that is connected to the solenoid check valve 52 through the small hole 54e and the bypass flow path 51a from the inner hole 54f as a part of the bottom side intake / exhaust path 332. That is, the small hole 54e is disposed on the upstream side of the solenoid check valve 52 and the relief valve 53 on the bypass channel 51a.
Further, in a state where the connecting member 54 is inserted into the insertion hole 51 b, the male screw portion 54 d of the connecting member 54 is exposed to the outside of the metal block body 51. Then, the discharge cylinder valve 43 and the metal block body 51 are connected by connecting the male screw portion 54d to the valve port 43a of the discharge cylinder valve 43 in a state where the connection member 54 is inserted into the insertion hole 51b. It is like that.

  In addition, as shown in FIG. 2, when the pressure applied to the discharge cylinder 33 during the discharge operation is equal to or higher than the set pressure for discharge, on the downstream side of the branch point with the bypass flow path 51a in the bottom side intake / exhaust path 332. A discharge relief valve 37 for releasing the hydraulic oil toward the oil reservoir 36 is provided on a flow path that branches from the bottom side intake / discharge path 332 and is connected to the bypass return flow path 511. The relief pressure of the discharge relief valve 37 is set higher than the relief pressure of the relief valve 53.

Next, the operation of the garbage truck according to this embodiment having the above-described configuration will be described.
As described above, in the present embodiment, the changeover switch 62 can select two types of control, that is, the normal mode and the strong compression mode.
First, when the normal mode is selected, the solenoid check valve 52 is controlled to always open the check function.
When dust is loaded in this normal mode, the dust thrown into the dust throwing box 3 is loaded toward the dust container 2 by the loading device 10, and the front end of the dust reaches the discharge plate 20. When the loading device 10 is further driven in this state, the dust is compressed and the force applied to the discharge plate 20 increases. Then, the pressure applied to the back pressure side oil chamber of the discharge cylinder 33 that suppresses the movement of the discharge plate 20 to the front (the back side of the dust storage box 2) is increased, and the set pressure for loading at which the relief valve 53 operates is set. When the pressure reaches, the relief valve 53 releases the hydraulic oil in the back pressure side oil chamber of the discharge cylinder 33 toward the oil reservoir 36 so that the pressure of the hydraulic oil becomes equal to or lower than the set pressure for loading. Accordingly, the discharge plate 20 moves slightly forward and stops. Each time the dust loading operation is performed, the discharge plate 20 repeats the forward movement little by little, and finally moves to the front end of the dust storage box 2 to be fully loaded.

When the dust is full, the dust input box 3 is tilted by an open / close cylinder (not shown), and then the discharge plate 20 is moved rearward from the front end of the dust container 2 to discharge the dust from the opening 2a. At this time, even if the check function of the solenoid check valve 52 is not functioning, the presence of the small hole 54e prevents the hydraulic oil from flowing through the bypass flow path 51a to the oil reservoir 36, and is sufficient. Dust can be discharged with a high discharge pressure. However, if the pressure rises above the set discharge pressure of the discharge relief valve 37 for some reason, the discharge relief valve 37 is activated and the hydraulic oil in the back pressure side oil chamber of the discharge cylinder 33 is supplied to the oil reservoir. Escape to 36.

Next, the operation when the strong compression mode is selected by the changeover switch 62 will be described.
In this case, the solenoid check valve 52 sets a state in which a check function for stopping the movement of the hydraulic oil that has entered the bypass passage 51a from the bottom side intake / exhaust passage 332 to the downstream side is in an initial state.
When the dust is loaded in this initial state, the dust thrown into the dust throwing box 3 is loaded toward the dust container 2 by the loading device 10 as in the normal mode. The pressure applied to the back pressure side oil chamber of the discharge cylinder 33 that suppresses the movement to the is increased.

Here, unlike the normal mode, even if the pressure in the back pressure side oil chamber of the discharge cylinder 33 reaches the set pressure for loading, the check function of the solenoid check valve 52 is still in operation, so the discharge plate 20 moves forward. Never do. In this mode, it is possible to continue loading work. As a result, even dust that is difficult to compress, such as corrugated cardboard, can be efficiently compressed.
In this mode, the trigger for moving the discharge plate 20 forward is the pressure applied to the back pressure side oil chamber of the pushing cylinder 31 of the loading device 10. That is, when the loading device 10 is driven to reach a pressure at which the cardboard or the like can be sufficiently compressed (the pressure applied to the back pressure side oil chamber of the pushing cylinder 31 reaches a predetermined value or more), the bottom side of the pushing cylinder 31 When detected by the pressure switch 61 connected to the intake / exhaust flow path 312, the control unit controls the solenoid check valve 52 so that the hydraulic oil in the back pressure side oil chamber of the discharge cylinder 33 is released to the oil reservoir 36 only instantaneously. To do. At this time, the pressure applied to the back pressure side oil chamber of the discharge cylinder 33 is higher than the set pressure of the relief valve 53, so that the hydraulic oil flows into the oil reservoir 36. As a result, the discharge plate 20 moves slightly forward and stops. Each time the dust loading operation is performed, the discharge plate 20 repeats the forward movement little by little, and finally moves to the front end of the dust storage box 2 to be fully loaded.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.
That is, in the above embodiment, the change-over switch 62 can be switched between the normal mode and the strong compression mode. However, the present invention is not limited to this, and only the strong compression mode may be used.
In the above embodiment, as a method of attaching the strong compression unit 50 to the hydraulic valve unit 40, the metal block body 51 and the discharge cylinder valve 43 are connected by the cylindrical connecting member 54. The invention is not limited to this, and the metal block body to which the solenoid check valve and the relief valve are attached may be connected to the discharge cylinder valve with a short pipe.
Moreover, in the said embodiment, although the loading apparatus 10 comprised with what was called a rotating plate type mechanism which has the pushing plate 11 and the rotating plate 12, this invention is not restricted to this, A loading device is made into a sliding plate. The compression plate may be constituted by a so-called press-type mechanism that operates as one cycle of inversion, lowering, compression, and raising.
In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use. The technical features described in each embodiment can be combined with each other, and a new technical feature can be formed by combining them.

  As described above, the present invention is useful for a garbage truck having a strong compression control function for efficiently loading bulky garbage such as cardboard.

2 Garbage storage box
2a opening
3 Dust input box
10 Loading device
20 Discharge plate
30 Hydraulic circuit
33 Discharge cylinder
36 Oil reservoir
40 Hydraulic valve unit
43 Valve for discharge cylinder
43a Valve port
50 Strong compression unit
51 Metal block body
51a Bypass channel
51b Insertion hole
52 Solenoid check valve
53 Relief valve
54 Connecting member
54e Small hole (diaphragm)
332 Bottom side intake / exhaust channel (intake / exhaust channel)

Claims (5)

A garbage storage box mounted on a chassis and having an opening;
A dust input box connected to the dust storage box so that the opening can be freely opened and closed;
A loading device for loading the dust thrown into the dust throwing box into the dust container box;
A discharge plate that is movably provided to change the volume of the dust storage space in the dust storage box and discharges the dust loaded in the dust storage box from the opening,
A discharge cylinder for moving the discharge plate;
A hydraulic circuit for hydraulically driving the loading device and the discharge cylinder;
In the garbage circuit provided with a multiple hydraulic valve unit for controlling the operating direction of the loading device and the discharge cylinder in the hydraulic circuit,
The hydraulic circuit has a strong compression that lowers the hydraulic pressure of the back pressure side oil chamber of the discharge cylinder when the pressure acting on the loading device reaches a predetermined value or more during the dust loading operation by the loading device. A unit is provided,
A garbage collection vehicle, wherein the strong compression unit is attached to the hydraulic valve unit. The hydraulic valve unit includes a discharge cylinder valve that switches expansion and contraction of the discharge cylinder, and the strong compression unit branches from an intake / exhaust flow path that connects a valve port of the discharge cylinder valve and a cylinder port of the discharge cylinder. A bypass flow path communicating with the oil reservoir, an upstream solenoid check valve and a downstream relief valve provided on the bypass flow path,
The garbage collection vehicle according to claim 1, wherein the solenoid check valve and the relief valve are connected in series in a hydraulic circuit. The garbage collection vehicle according to claim 2, wherein the bypass channel is provided in a metal block body, and the solenoid check valve and the relief valve are attached to the metal block body. An insertion hole is formed in the metal block body,
A cylindrical connecting member that forms part of the intake / exhaust flow path is inserted through the insertion hole,
The refuse collection vehicle according to claim 3, wherein a distal end portion of the connecting member is connected to the valve port of the discharge cylinder valve, and the discharge cylinder valve and the block body are connected to each other. 5. The circular wall around the shaft center of the connecting member is provided with a small hole as a throttle portion disposed upstream of the solenoid check valve and the relief valve on the bypass flow path. The listed garbage truck.

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