TWM581155U - Synchronous cylinder mechanism for surgical bed - Google Patents

Abstract

The invention discloses a synchronous cylinder mechanism of an operating bed, the bed of the operating bed comprising a waist section, the waist section being driven by a synchronous cylinder mechanism for lifting. The synchronous cylinder mechanism includes a first exhaustable hydraulic cylinder. The first exhaustable hydraulic cylinder comprises a cylinder, a piston, a sealing ring disposed on the piston, and a discharge hole disposed on the cylinder. The cylinder has an upper chamber, an upper passage, an upper joint that communicates with the upper chamber via the upper passage, a lower chamber, a lower passage, and a lower joint that communicates with the lower chamber via the lower passage. The discharge aperture communicates with the lower joint and above the lower tunnel. When the piston is located at a point such that the sealing ring is located below the discharge hole, the discharge hole communicates with the upper chamber, and when the piston moves to an end point such that the sealing ring is located above the discharge hole, the discharge hole communicates with the lower portion Chamber.

Description

Synchronous cylinder mechanism of the operating bed

The present invention relates to an operating bed, and more particularly to an operating bed using a synchronous cylinder mechanism.

Different from the general bed, the operating bed can not only adjust the patient's height and posture in response to the surgical needs, in addition to being able to lay the patient flat. Thus, the bed of the operating bed is typically divided into a plurality of independently operable segments, such as the head segment, the back segment, the waist segment, the hip segment, and the foot segment. A variety of designs have been available for such surgical beds, such as US 4,865,303, CN1565407A, and CN103610553A.

This type of operating bed generally uses one or more sets of synchronous cylinder systems. For example, the waist section of the bed body is equipped with a synchronous cylinder system to drive its lifting and lowering to ensure that the waist section can rise or fall in a balanced manner. The height position you want. The synchronous cylinder system usually combines two hydraulic cylinders to form a series synchronous cylinder system, which can be referred to the Chinese CN 104806589B, CN 205423367 U and CN 207131652 U patents, and the Taiwan M562347 patent.

However, there is often air remaining in the existing tandem synchronous cylinder system. Taking the CN 104806589B patent as an example, after the two synchronous hydraulic cylinders are connected by the pipeline, there is inevitably residual air in the space between the first cavity, the third cavity and the pipeline, and the air will follow the first piston. With the movement of the second piston, it runs around in the space and cannot be discharged, thereby affecting the synchronous operation and the service life of the two synchronous hydraulic cylinders. This means that in the conventional operating bed, the waist section driven by the synchronous cylinder system may be unbalanced and unbalanced, and the service life is not long.

In order to solve the above problems, the present invention provides a new synchronous cylinder mechanism for an operating bed, which preferably employs a plurality of exhaustable hydraulic cylinders for discharging internal air.

More specifically, a bed of the operating bed of the present invention includes a waist section that can be independently raised and lowered, the synchronous cylinder mechanism is configured to drive the waist section for lifting and includes a first exhaustable hydraulic cylinder, the first The exhaustable hydraulic cylinder comprises a cylinder, a piston, a piston rod, a sealing ring and a discharge hole. The cylinder has an upper chamber, an upper passage, an upper joint that communicates with the upper chamber via the upper passage, a lower chamber, a lower passage, and a lower joint that communicates with the lower chamber via the lower passage. The piston is movably disposed in the cylinder and is movable back and forth between a point in the cylinder and an end point. The piston rod is connected to the piston. The sealing ring is sleeved on the piston and has an outer peripheral wall abutting against an inner peripheral wall of the cylinder to form a seal, thereby isolating the upper and lower chambers. The discharge hole is disposed on the cylinder body and communicates with the lower joint and is located above the lower tunnel. Wherein, when the piston is at the starting point and the sealing ring is located below the discharge hole, the discharge hole communicates with the upper chamber, and when the piston moves to the end point to position the sealing ring above the discharge hole, the discharge hole communicates with the lower chamber.

In one embodiment, the discharge aperture has a small diameter section leading to the lower chamber and a large diameter section leading to the lower joint.

In one embodiment, the inner diameter of the lower tunnel is larger than the discharge orifice, and the inner diameter of the lower tunnel is equal to the inner diameter of the upper tunnel.

In an embodiment, the ventable hydraulic cylinder further includes an O-ring, and the O-ring is sleeved on the piston and sandwiched between the piston and the seal ring.

In one embodiment, the ventable hydraulic cylinder further includes a wear ring sleeved on the piston and above the seal ring, and an outer peripheral wall of the wear ring abuts against an inner peripheral wall of the cylinder.

In an embodiment, the synchronous cylinder mechanism of the present invention further includes a second exhaustable hydraulic cylinder and a connecting pipe, the second exhaustable hydraulic cylinder being identical to the first exhaustable hydraulic cylinder, the connection The two ends of the tube are respectively connected to the upper joint of the first exhaustable hydraulic cylinder and the lower joint of the second exhaustable hydraulic cylinder, and the upper chamber of the first exhaustable hydraulic cylinder is The volume containing the hydraulic oil is equal to the volume of the lower chamber of the second exhaustable hydraulic cylinder for containing the hydraulic oil.

In an embodiment, an inner diameter of the cylinder of the first exhaustable hydraulic cylinder is larger than an inner diameter of the cylinder of the second exhaustable hydraulic cylinder.

By the arrangement of the discharge holes, the air in the synchronous cylinder mechanism can be discharged, ensuring the synchronization of the synchronous cylinder mechanism and increasing the service life, so that the waist portion of the operating bed driven by the synchronous cylinder mechanism can be balancedly lifted and lowered. And increase the service life.

1 shows a preferred embodiment of a synchronous cylinder mechanism of the present invention. The surgical bed includes a bed 100, a support base 101 for supporting the bed 100, and a hydraulic drive mechanism 102 disposed on the support base 101. And a hydraulic circuit 103 connected to the hydraulic drive mechanism 102.

The bed 100 includes a waist section 100a that can be independently raised and lowered. The hydraulic drive mechanism 102 is used to drive the individual sections of the bed 100 such that the bed is in the desired state of 100. The hydraulic circuit 103 supplies the hydraulic power required for the hydraulic drive mechanism 102 to drive the bed 100. Among them, the hydraulic drive mechanism 102 further includes a synchronizing cylinder mechanism as shown in FIG. 2 for driving the waist section 100a to rise or fall.

2 and 3 show a preferred embodiment of the synchronous cylinder mechanism. In this embodiment, the synchronous cylinder mechanism preferably includes a first exhaustable hydraulic cylinder 1 and a second exhaustable hydraulic cylinder. 1a, in this embodiment, the two are connected by a connecting pipe 2 to form a series synchronous cylinder mechanism. In addition, the synchronous cylinder mechanism may be formed by connecting the first exhaust hydraulic cylinder 1 and one or more other hydraulic cylinders in series.

The first exhaustable hydraulic cylinder 1 includes a cylinder 11, a piston 12, a piston rod 13, a seal ring 14, and a discharge hole 15. The cylinder block 11 has an upper chamber 111 and a lower chamber 112. The piston 12 is movably disposed within the cylinder block 11 and is reciprocally movable between a point in the cylinder 11 (shown in Figure 2) and an end point (shown in Figure 3). The piston rod 13 is connected to the piston 12, is located in the upper chamber 111 and projects forwardly outside the cylinder 11, and can be expanded and contracted as the piston 12 moves. The cylinder block 11 also has an upper joint 113 and an upper passage 114, and the upper joint 113 communicates with the upper chamber 111 via the upper passage 114. The cylinder block 11 further has a lower joint 115 and a lower passage 116, and the lower joint 115 communicates with the lower chamber 112 via the lower passage 116.

As shown in FIGS. 2 and 4, the seal ring 14 is sleeved on the piston 12, and the outer peripheral wall of the seal ring 14 is in close contact with the inner peripheral wall of the cylinder block 11 to form a seal, thereby isolating the upper chamber 111 and the lower chamber 112. Hydraulic oil or other media within the two will not leak from one to the other. In this embodiment, an O-ring 131 is interposed between the seal ring 14 and the piston 12. In addition, the piston 12 is also sleeved with a wear ring 16 above the seal ring 14, ensuring that the piston 12 moves straight up and down without bias. Although the outer peripheral wall of the wear ring 16 abuts against the inner peripheral wall of the cylinder 11, it does not form a seal like the seal ring 14.

The discharge hole 15 is provided in the cylinder block 11 and communicates with the lower joint 115 and above the lower tunnel 116. When the piston 12 is at the starting point as shown in FIG. 2 such that the seal ring 14 is positioned below the discharge orifice 15, the discharge orifice 15 communicates with the upper chamber 111, and the lower orifice 116 is positioned below the seal ring 14 to communicate with the lower chamber 112. When the piston 12 is moved to the end point such that the seal ring 14 is positioned above the discharge orifice 15, both the discharge orifice 15 and the lower orifice 116 communicate with the lower chamber 112.

The second exhaustable hydraulic cylinder 1a has the same structure as the first exhaustable hydraulic cylinder 1, and thus includes a cylinder 11a, a piston 12a, a piston rod 13a, a seal ring 14a, and a discharge. The hole 15 a, the cylinder 11 a also has an upper chamber 111a, a lower chamber 112a, an upper joint 113a, an upper passage 114a, a lower joint 115a and a lower passage 116a. The piston 12a is also provided with a sealing ring 14a, an O-ring 131a and a wear ring 16a. The structure and function of these components are the same as those of the first exhaustable hydraulic cylinder 1, and will not be described.

In this embodiment, the inner diameter of the cylinder 11 of the first exhaustable hydraulic cylinder 1 is larger than the inner diameter of the cylinder 11a of the second exhaustible hydraulic cylinder 1a, but the volume of the upper chamber 111 of the former is equal to The volume of the latter lower chamber 112a, referred to herein as the volume, is the volume used to contain the hydraulic oil. Therefore, connecting the upper joint 113 of the first exhaustable hydraulic cylinder 1 and the lower joint 115a of the second exhaustable hydraulic cylinder 1a with the connecting pipe 2 constitutes a series oil in which the two piston rods 13, 13a can simultaneously expand and contract. Pressure synchronous cylinder mechanism.

As shown in FIG. 2, when the hydraulic circuit 103 (including the oil tank, not shown) feeds the lower joint 115 of the first exhaust hydraulic cylinder 1, the hydraulic oil from the hydraulic circuit 103 passes through the lower tunnel. 116 enters the lower chamber 112 and pushes the piston 12 upward from the starting point to the end point. Since the upper chamber 111 communicates with the lower chamber 112a through the upper tunnel 114, the connecting pipe 2 and the lower tunnel 116a of the second exhaustable hydraulic cylinder 1a, the upward movement of the piston 12 pushes the upper chamber 111, The hydraulic oil in the connecting tube 2 and the lower chamber 112a is such that the piston 12a also moves upward from the starting point to the end point, and the hydraulic oil (or other medium) pushed in the upper chamber 111a flows out from the upper joint 113a through the upper opening 114a. Thereby, the synchronous movement of the two piston rods 13 and 13a is achieved. On the contrary, when the hydraulic circuit 103 feeds the upper joint 113a of the second exhaustable hydraulic cylinder 1a, as shown in FIG. 3, the hydraulic oil from the hydraulic circuit enters the upper chamber 111a via the upper passage 114a. And pushing the piston 12a downward from the end point to the starting point, the downward movement of the piston 12a pushes the hydraulic oil in the lower chamber 112a, the connecting pipe 2 and the upper chamber 111, so that the piston 12 also moves downward from the end point to the starting point. Thereby, the simultaneous downward movement of the two piston rods 13 and 13a is achieved.

In the description of the preceding paragraph, the cylinders 11, 11a and the connecting pipe 2 are filled with hydraulic oil, and it is explained how the hydraulic oil is filled into the empty two cylinders 11 and 11a. As shown in FIG. 2, the connecting pipe 2 is connected to the empty cylinders 11 and 11a, and the upper joint 113a and the lower joint 115 are respectively connected to the above-mentioned hydraulic circuit 103, and at this time, the cylinders 11, 11a and the connecting pipe 2 are respectively provided. air. First, the hydraulic circuit 103 supplies hydraulic oil to the upper chamber 111a of the cylinder 11a via the upper joint 113a to fill the upper chamber 111a with hydraulic oil, and the gap between the piston 12a and the inner peripheral wall of the cylinder 11a. (located above the seal ring 14 a ), flows to the discharge hole 15 a , and flows into the upper chamber 111 of the cylinder 11 through the discharge hole 15 a and the connection pipe 2 . During this process, part of the hydraulic oil also flows into the lower chamber 112a of the cylinder 11a via the lower tunnel 116a.

As the hydraulic oil continues to be input, the hydraulic oil fills the upper chamber 111 and flows to the discharge hole 15 via the gap between the piston 12 and the inner peripheral wall of the cylinder 11 (above the seal ring 14), and then discharges The hole 15 and the lower joint 115 flow into the hydraulic circuit and then flow back into the oil tank. During this process, a portion of the hydraulic oil will flow into the lower chamber 112 of the cylinder 11 via the lower passage 116. After the hydraulic oil is supplied for a while, the upper and lower chambers 111a and 112a of the cylinder 11a, and the upper and lower chambers 111 and 112 of the cylinder 11 are filled with hydraulic oil to perform the above-described piston rods 13 and 13a. Telescopic operation.

During the input of the above hydraulic oil, the air originally present in the upper chamber 111a is pushed downward by the hydraulic oil coming in from the upper joint 113a, and via the gap between the piston 12a and the inner peripheral wall of the cylinder 11a, It flows to the discharge hole 15a, and flows into the upper chamber 111 of the cylinder block 11 via the discharge hole 15a and the connection pipe 2. The air in the upper chamber 111 flows through the gap between the piston 12 and the inner peripheral wall of the cylinder 11 to the discharge hole 15, and then flows into the hydraulic circuit through the discharge hole 15 and the lower joint 115, and then flows into the oil tank, and then flows into the oil tank. It is discharged to the outside by an exhaust mechanism of the fuel tank. Among them, the exhaust mechanism of the fuel tank is a conventional technique. For example, the Taiwan Patent No. 200609176 discloses that a fuel tank has a venting valve, and the venting valve can discharge the air in the fuel tank out of the fuel tank; Taiwan Patent No. M431812 discloses a hydraulic power system. One of the fuel tanks has an air venting hole; the Chinese CN107934784A patent discloses that a fuel tank can be exhausted and decompressed by a manual exhaust rod; the Chinese CN105805060B patent discloses that a hydraulic oil tank has an exhaust port; the Chinese CN107781235A patent discloses that a fuel tank has a fuel tank Automatic exhaust valve; China CN106640785A patent discloses a hydraulic safety oil tank with an exhaust device exhaust box, exhaust column and exhaust port, so that the fuel tank can be quickly exhausted.

It should be noted that in this embodiment, although the wear rings 16 and 16a are respectively sleeved on the pistons 12 and 12a, as described above, the wear rings 16 and 16a do not form a seal like the seal rings 14 and 14a, so The pushed hydraulic oil and air can still flow through the gap between the wear ring 16 and the cylinder block 11, and can also flow through the gap between the wear ring 16a and the cylinder block 11a.

As is apparent from the above description, the air originally present in the cylinders 11, 11a and the connecting pipe 2 is discharged during the process of filling the hydraulic fluid into the cylinders 11, 11a by the arrangement of the discharge holes 15 and 15a. Outside the cylinders 11, 11a. In this way, there will be no air inside the synchronizing cylinder mechanism to ensure operational synchronization and increase service life.

During the above-described hydraulic oil filling process, there may be a case where a little air is rushed into the lower chamber 112a of the cylinder 11a and/or the lower chamber 112 of the cylinder 11, even if it is performed one or more times. The lifting operation of 13 and 13a, at this point, the air will be all rushed to the fuel tank, and then discharged to the outside by the exhaust mechanism of the fuel tank. For example, the piston rods 13 and 13a can be moved up together by hydraulic oil from the joint 115, and then can be moved down together by hydraulic oil from the joint 113a. During the downward movement, the air located in the lower chamber 112 is pushed into the hydraulic circuit due to the downward movement of the piston 12, then enters the fuel tank, and is discharged to the outside by the exhaust mechanism of the oil tank. The air located in the lower chamber 112a enters the upper chamber 111 via the connecting pipe 2 due to the downward movement of the piston 12a, and continues to move from the joint 113a when the pistons 12, 12a are moved down to the position shown in FIG. The hydraulic oil is input, and the air in the upper chamber 111 flows to the discharge hole 15 via the gap between the piston 12 and the inner peripheral wall of the cylinder 11, and then flows into the hydraulic circuit through the discharge hole 15 and the lower joint 115, and then flows. The fuel tank is then discharged to the outside by the exhaust mechanism of the fuel tank.

In this embodiment, as shown in FIG. 4, the discharge hole 15a of the second exhaustable hydraulic cylinder 11a has a small diameter section 151a which leads to the inside of the cylinder 11a and has a smaller inner diameter, and leads to the lower joint 115. a large diameter section 152a having a larger inner diameter, but the inner diameter of the entire discharge hole 15a may be the same. The first exhaustable hydraulic cylinder 1 is also the same, and will not be described.

Preferably, the inner diameter of the lower tunnel 116a of the second exhaustable hydraulic cylinder 11a is larger than the discharge hole 15a and equal to the inner diameter of the upper tunnel 114a, but the inner diameter of the lower tunnel 116a may also be equal to or smaller than the discharge aperture 15a. . The first exhaustable hydraulic cylinder 1 is also omitted and will not be described again.

In summary, the waist section of the operating bed of the present invention is provided with a synchronous cylinder mechanism composed of an exhaust hydraulic cylinder, which can solve the problem of unbalanced lifting and low service life of the waist portion of the conventional operating bed, and ensures the new type. The waist section of the operating bed can be lifted and lowered in balance and increased in service life.

100‧‧‧ bed body

100a‧‧‧ Waist section  101‧‧‧ support  102‧‧‧Hydraulic drive mechanism

103‧‧‧Hydraulic circuit  1, 1a‧‧‧ hydraulic cylinder

11, 11a‧‧‧ cylinder  111, 111a‧‧‧ upper chamber

112, 112a‧‧‧ lower chamber  113, 113a‧‧‧ upper joint

114, 114a‧‧‧ Upper Tunnel  115, 115a‧‧‧ lower joint

116, 116a‧‧‧ lower tunnel  12, 12a‧‧‧Pistons

13, 13a‧‧‧ piston rod  14, 14a‧‧‧ Sealing ring

15, 15a‧‧‧Exhaust holes  16, 16a‧‧‧ wear ring

131, 131a‧‧ O-ring  2‧‧‧Connecting tube  

Figure 1 shows a side view of a preferred embodiment of the surgical bed of the present invention.  Figure 2 shows a cross-sectional view of the synchronized cylinder mechanism of the surgical bed of the present invention (the piston is at the starting point).  Figure 3 shows a cross-sectional view of the synchronizing cylinder mechanism of the present invention (the piston is at the end).  Figure 4 is a partial enlarged cross-sectional view showing the synchronizing cylinder mechanism of the present invention.  

Claims (7)

A synchronous cylinder mechanism of an operating bed, wherein a bed of the operating bed includes a waist section that can be independently raised and lowered, the synchronous cylinder mechanism is configured to drive the waist section for lifting and includes a first exhaustable hydraulic cylinder, the first A ventable hydraulic cylinder includes:  a cylinder having an upper chamber, an upper passage, an upper joint communicating with the upper chamber via the upper passage, a lower chamber, a lower passage, and a lower joint communicating with the lower chamber via the lower passage;  a piston movably disposed in the cylinder and movable between a point of the cylinder and an end point;  a piston rod connecting the piston;  a sealing ring sleeved on the piston and having an outer peripheral wall abutting against an inner peripheral wall of the cylinder to form a seal, thereby isolating the upper and lower chambers;  a discharge hole disposed on the cylinder and communicating with the lower joint and located above the lower passage, wherein the discharge hole communicates when the piston is located at the starting point and the sealing ring is located below the discharge hole The upper chamber communicates with the lower chamber when the piston moves toward the end point such that the seal ring is positioned above the discharge orifice.   The synchronous cylinder mechanism of the operating bed according to claim 1, wherein the first exhaustable hydraulic cylinder has a small diameter section leading to the inside of the cylinder and a large diameter section leading to the lower joint . The synchronous cylinder mechanism of the operating bed according to claim 1 or 2, wherein an inner diameter of the lower tunnel of the first exhaustable hydraulic cylinder is larger than the discharge hole, and an inner diameter of the lower tunnel is equal to the upper tunnel the inside diameter of. The synchronous cylinder mechanism of the operating bed according to claim 1, wherein the first exhaustable hydraulic cylinder comprises an O-ring, the O-ring is sleeved on the piston, and is sandwiched between the piston and the sealing ring. between. The synchronous cylinder mechanism of the operating bed according to claim 1, wherein the first exhaustable hydraulic cylinder comprises a wear ring sleeved on the piston and located above the seal ring, and an outer peripheral wall of the wear ring Abuts against an inner peripheral wall of the cylinder. The synchronous cylinder mechanism of the operating bed according to any one of claims 1 to 5, comprising a second exhaustable hydraulic cylinder and a connecting pipe, the second exhaustable hydraulic cylinder being identical to the first exhaustable a hydraulic cylinder, the two ends of the connecting pipe are respectively connected to the upper joint of the first exhaustable hydraulic cylinder and the lower joint of the second exhaustable hydraulic cylinder, and the first exhaustable hydraulic cylinder The volume of the upper chamber for containing hydraulic oil is equal to the volume of the lower chamber of the second exhaustable hydraulic cylinder for containing the hydraulic oil. The synchronous cylinder mechanism of the operating bed according to claim 6, wherein an inner diameter of the cylinder of the first exhaustable hydraulic cylinder is larger than an inner diameter of the cylinder of the second exhaustable hydraulic cylinder.